Speed Breeding in Wheat Crop: A comprehensive Review

Abstract

Speed breeding has emerged as a transformative strategy in modern plant breeding, offering the potential to significantly shorten breeding cycles and enhance genetic gains, particularly in wheat (Triticum aestivum L.), one of the world’s most critical staple crops. This review comprehensively examines the principles, methodologies, applications, and future prospects of speed breeding in wheat improvement. The technique relies on the manipulation of environmental parameters such as extended photoperiods, controlled temperature regimes, and optimized light intensity to induce rapid plant growth and early flowering, thereby enabling multiple generations per year up to 4–6 in wheat, compared to the traditional 1–2. Key techniques include the use of high-throughput phenotyping platforms, growth chambers, and LED lighting systems to accelerate generation turnover and facilitate the rapid fixation of desirable traits. Speed breeding has been successfully integrated with other modern breeding approaches such as marker-assisted selection, genomic selection, and CRISPR/Cas-based genome editing to improve yield, biotic and abiotic stress resistance, and climate adaptability in wheat cultivars. Notable case studies from Australia, the UK, and India demonstrate the successful application of speed breeding in developing elite wheat lines with enhanced agronomic traits. Despite its advantages, speed breeding faces several challenges, including limited infrastructure in developing regions, potential loss of genetic diversity, and the need for crop-specific protocol optimization. The review also highlights future directions, including automation, integration with artificial intelligence for trait prediction, and the expansion of speed breeding to underutilized cereals and legumes. Ultimately, speed breeding holds immense promise for achieving food and nutritional security under the looming threats of climate change and a growing global population. Its widespread adoption in wheat breeding programs can revolutionize the pace and precision of varietal development for sustainable agriculture.