Deficit irrigation and low nitrogen (N) fertilization rate cause negative effects on maize grain productivity; such effects differ from genotype to genotype. The main objectives of the present investigation were to: (i) identify the drought and low N tolerant genotypes, (ii) esti...
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Research Article10.9734/arrb/2020/v35i630232
Among the phenotypic, biochemical, and molecular methods employed in assessment of genetic diversity, the phenotypic method has proven efficient for the assessment, description and classification of germplasm collections to enhance their use in maize breeding. The objectives of t...
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Research Article10.9734/arrb/2020/v35i230191
Identifying maize genotypes with favorable root architecture traits for drought tolerance is prerequisite for initiating a successful breeding program for developing high yielding and drought tolerant varieties of maize. The aims of the present study were: (i) to identify drought...
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Research Article10.9734/arrb/2019/v32i230079
Strong associations between agronomic and physiologic traits and drought tolerance, high heritability and high genetic advance for such traits would allow plant breeder to use such traits as selection criteria for selecting drought tolerant genotypes. The objectives of the presen...
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Research Article10.9734/ajbgmb/2018/v1i327501
The presence of genotypic differences in performances under soil water deficit would help plant breeders in initiating successful breeding programs to improve drought tolerance. The objectives of the present study were: (i) to assess the effects of genotype, water stress and thei...
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Research Article10.9734/ARRB/2018/45369
Information on heritability and trait association in crops assist breeders to allocate resources necessary to effectively select for desired traits and to achieve maximum genetic gain with little time and resources. The objectives of this investigation were to determine the amoun...
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Research Article10.9734/ajbgmb/2018/v1i1443
Genotypes tested in different locations, years or planting dates often change in yield due to the response of genotypes to environmental factors such as temperature, soil fertility etc. The objectives of the present study were to evaluate the effects of environment factors on agr...
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Research Article10.9734/ARRB/2018/41324
Developing high performing and stable sorghum genotypes across different environments is of utmost importance to plant breeders. This study was conducted to compare relative stability of 25 grain sorghum B-lines under Egyptian conditions for some agronomic and yield traits. Six e...
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Research Article10.9734/AJAHR/2018/40985
Presence of G×E interaction reduces the correlation between genotypic and phenotypic parameters and complicates progress of selection. Among several methods proposed for evaluation of the GE interaction, the AMMI and GGE-biplot are the most informative models. The objective of th...
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Research Article10.9734/ARRB/2018/39491
Many plants accumulate compatible osmolytes at high levels in plant cells such as amino acids and/or develop special epidermal cell bladders which may serve as external water reservoirs and having small and thick-walled cells in response to water deficit. The objectives of the pr...
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Research Article10.9734/ARRB/2018/39048
Knowledge of genetic diversity is one of the important tools used for genetic management of quinoa accessions for plant breeding. This research aimed to molecularly characterize five quinoa genotypes using ISSR markers to reveal genetic polymorphism and identify unique markers fo...
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Research Article10.9734/BJI/2017/37053
There are genotypic differences in drought tolerance (DT) among quinoa (Chenopodium quinoa) cultivars, and most of the known mechanisms of drought tolerance are encountered in this species. The objectives of the present investigation were to identify the most drought tolerant qui...
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Research Article10.9734/AJAAR/2017/37216
A. M. M. Al-Naggar, R. M. Abd El-Salam, A. E. E. Badran, S. T. Boulos & Mai M. A. El-Moghazi·Asian Journal of Biology·2017
Many plants can avoid the adverse effects of drought by developing special epidermal cell bladders which may serve as external water reservoirs and having small and thick-walled cells. The present investigation aimed at: (i) studying the effect of drought stress on quinoa leaf an...
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Research Article10.9734/AJOB/2017/37214
Strong associations between yield and given traits along with high heritability for such traits would allow plant breeder to use these traits as selection criteria for selecting high yielding genotype. The present investigation aimed at elucidating the relationships among agronom...
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Research Article10.9734/ACRI/2017/37215
Studying genotypic variation in quinoa germplasm is a prerequisite to start a breeding program aiming at improving its productivity under water stress conditions. The objectives of this investigation were: (i) to evaluate the effects of drought stress on morphological, physiolog...
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Research Article10.9734/AJAAR/2017/36655
Maximum yield per unit area may be obtained by growing maize hybrids that can withstand high plant density. Maize genotypes differ in plant density tolerance (PDT). The objectives of the present investigation were to identify the density tolerant genotypes, to estimate the superi...
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Research Article10.9734/ARJA/2017/36053
Type of gene action, heritability and genetic advance from selection are prerequisites for starting a breeding program for developing plant density tolerant variety of maize. The objective of the present investigation was to estimate general (GCA) and specific (SCA) combining abi...
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Research Article10.9734/AJAAR/2017/36040
Secondary Traits and Selection Environment of Plant Density Tolerance in Maize Inbreds and Testcrosses Secondary traits in maize are used in screening programs for selecting tolerant genotypes to a specific abiotic stress. Indirect selection would be effective if heritability of...
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Research Article10.9734/JABB/2017/35510
Knowledge on combining ability and type of gene action of available germplasm would help maize breeder in identifying proper parents and breeding procedure for improving plant density tolerance (PDT). A split plot experiment with three replications was carried out; where plant de...
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Research Article10.9734/JALSI/2017/35508
Information on the heterosis of maize germplasm is essential in maximizing the effectiveness of hybrid development. The objectives of the present study were to assess the effects of elevated plant density on mean performance and heterobeltiosis and to identify the best testcrosse...
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Research Article10.9734/ACRI/2017/35509
The main objective of the present investigation was to estimate combining ability, genetic variance components and heritability of 12 morphologic traits of maize under water stress (WS) and well watering (WW) at flowering stage. Fifteen F1 genotypes of incomplete diallel crosses...
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Research Article10.9734/ACRI/2017/32618
Studying mode of gene action for maize traits under high plant density is a prerequisite for conducting an appropriate breeding program for developing high density tolerant varieties. The objective of this study was to assess maize diallel crosses for mean performance, combining...
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Research Article10.9734/JABB/2017/31550
The doubled haploid lines (DHL) of maize in their top crosses are expected to include genotypes that accumulated favorable genes for both high-yielding and drought tolerance. The objectives of this study were: (i) to screen 254 DHL's x tester crosses for tolerance to water stress...
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Research Article10.9734/JALSI/2016/29524
One of the major advantages of doubled haploid lines (DHL) is the maximum genetic variance between lines for testcross performance from the first generation. Two hundred fifty four testcrosses were produced as a result of crossing between 254 DHL's and an inbred line tester. The...
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Research Article10.9734/ACRI/2016/29523
Breeding value is the main parameter of initial screening through top cross analysis as it represents the general combining ability (GCA) effects of individual test line. Two hundred fifty four top crosses were produced as a result of crossing between 254 doubled haploid lines (D...
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Research Article10.9734/JABB/2016/29522
The objectives of the present investigation were to determine the type of gene action, heritability and expected genetic advance from selection for agronomic and yield traits of maize under high plant density (HD) stress and low density (non-stress) and to identify the parents th...
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Research Article10.9734/JABB/2016/28413
Indirect selection would be effective if heritability of the secondary trait is greater than that of the primary trait and genetic correlation between them is strong. The objectives of this investigation were to identify secondary trait(s) for selection of high maize grain yield...
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Research Article10.9734/JABB/2016/28603
Aim: The objectives of this investigation were to identify secondary trait(s) for selection of high maize grain yield under high plant density combined with drought stress at flowering and to identify whether the best selection environment is the optimum or stressed one. Study De...
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Research Article10.9734/JALSI/2016/28582
The objectives of the present investigation were to determine the type of gene action, heritability and expected genetic advance from selection for agronomic and yield traits of maize under water stress and optimum irrigation and to identify the parents that contain favorable gen...
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Research Article10.9734/ACRI/2016/28281
The objective of this study was to assess performance, heterosis and combining ability parameters and their interrelationships in six maize inbreds and their 15 diallel F1 crosses under different plant densities (D). Three experiments were carried out in each season of 2013 and 2...
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Research Article10.9734/JALSI/2016/28067
The objectives of the present investigation were to determine genetic variance components, heritability and expected genetic advance from selection for agronomic traits of maize under water stress at flowering combined with high plant density; 95,200 plants/ha(WS-HD) as compared...
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Research Article10.9734/JALSI/2016/28414
The objective of this study was to assess mean performance, heterosis and combining ability and their interrelationships in six maize inbreds and their 15 diallel F1 crosses under elevated plant density (D). Three experiments were carried out in each season of 2013 and 2014, usin...
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Research Article10.9734/JABB/2016/28127
The objectives of this investigation were to identify secondary trait(s) for selection of high maize grain yield under drought stress conditions and to identify whether the best selection environment is the optimum or stressed one. Diallel crosses among diverse inbreds in toleran...
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Research Article10.9734/ARJA/2016/28552
The objective of the present investigation was to test the validity of predictions of GCA and SCA effects from mean performance and/or heterobeltiosis for agronomic and yield traits under elevated plant density (D) combined with water deficit. Six maize inbreds varying in high-D...
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Research Article10.9734/ARJA/2016/28126
Information on heterosis and combining ability of available germplasm would help maize breeder in identifying proper genotypes and breeding procedures for improving tolerant varieties to water stress. The objective of this investigation was to assess the performance, heterobelti...
Open access
Research Article10.9734/ACRI/2016/27508
Selecting superior parents for hybrid combinations and studying the nature of genetic variation are prerequisites for starting a successful breeding program. The main objective of the present study was to assess performance, useful heterosis and combining ability among ma...
Open access
Research Article10.9734/JABB/2016/27507
High plant density and full irrigation along with the use of high density-tolerant genotype would lead to maximizing maize (Zea mays L.) grain productivity per unit land area. The objective of this investigation was to match the functions of optimum plant density and adequate irr...
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Research Article10.9734/JABB/2016/26881
The use of high plant density (PD) along with tolerant genotypes to high PD would overcome the negative impacts of competition stresses and lead to maximizing maize yield of grain (GYPH), protein (PYPH), oil (OYPH) and starch (SYPH) from the unit land area (ha). The main objectiv...
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Research Article10.9734/ARJA/2016/26730
Aim: The objective of this investigation was to match the functions of optimum plant density to produce the highest possible grain yield per unit area with the greatest maize genotype efficiency. Study Design: A split plot design in randomized complete block arrangement was used...
Open access
Research Article10.9734/JALSI/2016/26811
The main objective of the present investigation was to identify the optimum plant density for the best performance of grain protein, oil and starch contents and yields of different maize genotypes via quadratic regression functions. Diallel crosses among diverse maize inbreds wer...
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Research Article10.9734/JABB/2016/26692
Maize is considered susceptible to drought stress, when occurs at flowering stage. Thus, the development of drought tolerant maize cultivars is of important priority for plant breeders. The objectives of the present study were: (i) to assess the effect of maize genotype (G), irri...
Open access
Research Article10.9734/JAERI/2016/25438
The main objective of this investigation was to study the effects of deficit irrigation (I) at flowering stage, genotype (G) and G × I interaction on maize grain quality and yield traits of 6 inbred lines and their 15 diallel crosses. The parents and F1's were evaluated in two se...
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Research Article10.9734/IJPSS/2016/23570
Breeding wheat cultivars with improved adaptation to low soil-N, has gained importance worldwide in order to decrease N fertilizer consumption and overcome the ecological and economic problems of the misuse of this fertilizer. Identification of wheat crosses that show useful hete...
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Research Article10.9734/BBJ/2016/21916
To start an accurate wheat breeding program for improving low-N tolerance, information on the type of gene action controlling the inheritance of grain yield and quality traits under contrasting N environments should be available, which is the objective of the present investigatio...
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Research Article10.9734/ARRB/2015/21939
There is an increased interest worldwide in developing wheat cultivars that are more efficient in utilizing nitrogen (N) and better fitted to N limitations. The objective of this investigation was to study the effects of contrasting soil N levels on the genetic parameters control...
Open access
Research Article10.9734/ARRB/2015/21938
Developing nitrogen use efficient (NUE) genotypes of wheat could reduce crop N fertilizer requirement. However, selection for NUE alone can be difficult and less efficient than associating it with one or more of selection criteria. The aim of this study was to determine selection...
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Research Article10.9734/JAERI/2016/21917
Screening wheat germplasm based on grain yield (GYPP) and nitrogen use efficiency (NUE) under contrasting N environments may be useful in identifying N-efficient (low-N tolerant) and responsive genotypes of great value in breeding programs. The main aim of the present study was t...
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Research Article10.9734/IJPSS/2015/21915
The objective of the present investigation was to study the effect of salt affected soils in different locations in Egypt on performance, variability, correlations, heritability, and genetic advance from selection of 117 bread wheat doubled haploids and 4 checks. The experiments...
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Research Article10.9734/IJPSS/2015/18900
Although screening large numbers of wheat genotypes for salinity tolerance under controlled elevated salinity levels in the greenhouse is useful, the final screening in the field at different locations, where soils are naturally affected with salt and other uncontrolled factors i...
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Research Article10.9734/JAERI/2015/18920
In an attempt to develop drought tolerant genotypes of bread wheat, two procedures, i.e., mutation and hybridization were used to induce new genetic variation. Selection for high grain yield/plant (GYPP) and other desirable traits was practiced in the M2 populations of 7 gamma ir...
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Research Article10.9734/BBJ/2015/15898
Selection from established high yielding pure line wheat cultivars would rarely isolate a new genotype. Inducing new genetic variation in bread wheat populations via gamma ray irradiation and hybridization procedures and isolating drought tolerant genotypes from derived heterogen...
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Research Article10.9734/IJPSS/2015/15018
One of the reasons Egypt do not achieve very high maize crop yield is that cultivars used commercially are bred and grown under low plant density (ca 20,000 plants/ fed; one fed= 4200 m2). Therefore, the objective of the present study was to identify maize genotypes of tolerance...
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Research Article10.9734/JABB/2015/15118
Genetic variability in salt tolerance of bread wheat could be induced via crossing diverse parents and producing doubled haploid (DH) lines from such crosses. One hundred seventeen DH lines resulted via anther culture technique from the cross between Sakha-8 (salt tolerant old va...
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Research Article10.9734/IJPSS/2015/15119
Increasing plant density and improving N-fertilizer rate along with the use of high-density tolerant genotypes would lead to maximize maize grain productivity from unit land area. The objective of this investigation was to match the functions of optimum plant density and adequate...
Open access
Research Article10.9734/JAERI/2015/14260
Maize grain yield response to elevated levels of soil nitrogen is dependent upon genotype of the cultivar. Thus the optimum rate of N-fertilizer differs from maize genotype to another according to its nitrogen use efficiency (NUE). The main objective of this study was to determin...
Open access
Research Article10.9734/IJPSS/2015/14228