Venkateshwarlu Challa, Kole Paresh Chandra, Singh Arun Kumar, Paul Pronob J, Sinha Pallavi, Singh Vikas Kumar, Kumar Arvind
South Asia Hub, International Rice Research Institute (IRRI), International Crops Institute for the Semi-Arid Tropics (ICRISAT) Campus, Hyderabad, Telangana, India.
Institute of Agriculture, Visva Bharati University, Bolpur, West Bengal, India.
Front Plant Sci. 2025 Jan 7;15:1495241. doi: 10.3389/fpls.2024.1495241. eCollection 2024.
In the rapid climate change scenario and subsequent rainfall patterns, drought has emerged as a bottleneck for crop production across crops, especially in rainfed rice. Drought significantly affects the development and production of most modern rice cultivars. Thus, recent breeding efforts have aimed to integrate drought tolerance traits in existing rice varieties through conventional and molecular approaches. The identification of grain yields quantitative trait loci (QTLs) under drought conditions, an important trait with high selection efficiency, may lead to the development of drought-tolerant rice varieties. The study reported the grain yield QTLs identified under the reproductive stage of drought stress in the F-derived mapping population from Kasturi (drought-sensitive) × Chao Khaw (drought-tolerant). Thirteen QTLs () were identified based on two years of field data. Comparative analysis revealed two robust and consistent QTLs, and , which explained the PVEs of 11.61% to 12.88% and 15.79% to 18.77%, respectively. However, was found at the nearest position to the previously identified . Through candidate gene analysis, the identified QTL regions in chromosome 1 ( ) and chromosome 8 ( ) revealed seven and five candidate genes, respectively, based on gene ontology that were significantly associated with rice grain yield-related drought traits. In conclusion, this study identified key consistent drought yield QTLs in a drought-tolerant exotic landrace. The identified QTLs provide valuable insights and resources for ongoing efforts to develop drought-tolerant rice varieties. They can be further utilized in drought breeding programs to enhance the drought resilience of existing varieties or to develop new varieties.
在快速的气候变化情景及随之而来的降雨模式下，干旱已成为各类作物生产的瓶颈，尤其是在雨养水稻方面。干旱显著影响大多数现代水稻品种的发育和生产。因此，近期的育种工作旨在通过传统和分子方法将耐旱性状整合到现有水稻品种中。在干旱条件下鉴定产量相关数量性状位点（QTL），这是一个具有高选择效率的重要性状，可能会促进耐旱水稻品种的培育。该研究报道了在Kasturi（干旱敏感型）×Chao Khaw（耐旱型）杂交衍生的作图群体干旱胁迫生殖阶段鉴定出的产量QTL。基于两年的田间数据鉴定出13个QTL。比较分析揭示了两个稳定且一致的QTL，分别为 和 ，其表型变异解释率分别为11.61%至12.88%和15.79%至18.77%。然而，发现 与先前鉴定的 位置最接近。通过候选基因分析，基于基因本体论，在第1染色体（ ）和第8染色体（ ）上鉴定出的QTL区域分别揭示了7个和5个与水稻产量相关干旱性状显著相关的候选基因。总之，本研究在一个耐旱的外来地方品种中鉴定出关键的一致干旱产量QTL。所鉴定的QTL为当前培育耐旱水稻品种的工作提供了有价值的见解和资源。它们可进一步用于干旱育种计划，以增强现有品种的耐旱性或培育新品种。
