Kumar Narendra, Jeena Neha, Kumar Amit, Khwairakpam Rowndel, Singh Hukum
Department of Plant Physiology, College of Basic Science and Humanities, G.B. Pant University of Agriculture & Technology, Pantnagar, 263145 Uttarakhand, India.
Department of Biotechnology, Bhimtal Campus Kumaun University, Nainital, Uttarakhand, India.
Heliyon. 2021 Jul 5;7(7):e07474. doi: 10.1016/j.heliyon.2021.e07474. eCollection 2021 Jul.
Increasing atmospheric temperature is the consequence of global warming, which is expected to influence crop growth and development, resulting in declining productivity in the tropical agriculture system. The selection of temperature tolerant crop cultivars with higher productivity to meet the future demand of the world expanding human population requires a thorough understanding of crop growth feedback to increasing temperature. Therefore, a field experiment was conducted during season of 2012 and 2013 to understand the response of yield and yield-related traits of eleven rice cultivars to elevated temperature grown inside field mounted temperature gradient tunnel (TGT) in the Bhabar region of the Indian Himalayas. The elevated temperature significantly impacted growth and yield and yield-related traits, especially tillers, panicles, filled and chaffy grains, grain, and 1000 grain weight, yield, and harvest index of all the cultivars during both years. The cultivars, IET 21404 and IET 21577, were reported to produced more tillers in 2012, whereas IET 21411 and KRH 2 had a maximum 2013. Likewise, maximum panicles were reported in IET 21404 and IET 21577 in 2012, while IET 21411, IET 21582, and KRH 2 in 2013 under elevated temperature. The highest grain filling under high temperature in 2012 was found in IET 21577, then IET 21404; however, IET 21411 and IET 21405 were the highest filled grains in 2013. Consequently, the cultivars IET 21577 and IET 21404 were reported as more tolerant towards yielding higher grain weight and Harvest Index. This study offers an opportunity to screen temperature tolerant cultivars with increased productivity for fulfilling the demand of rice-dependent regions in future changing climatic conditions.
大气温度升高是全球变暖的结果，预计这将影响作物的生长发育，导致热带农业系统的生产力下降。为了满足世界不断增长的人口的未来需求，选择具有更高生产力的耐温作物品种需要深入了解作物生长对温度升高的反馈。因此，在2012年和2013年期间进行了一项田间试验，以了解印度喜马拉雅山巴伯尔地区田间安装的温度梯度隧道（TGT）内种植的11个水稻品种的产量及与产量相关性状对高温的响应。高温对所有品种的生长、产量及与产量相关的性状均有显著影响，尤其是分蘖、穗数、实粒和秕粒、粒重、千粒重、产量和收获指数，在这两年中都是如此。据报道，品种IET 21404和IET 21577在2012年产生的分蘖更多，而IET 21411和KRH 2在2013年产生的分蘖最多。同样，在高温条件下，2012年IET 21404和IET 21577的穗数最多，而2013年IET 21411、IET 21582和KRH 2的穗数最多。2012年高温下籽粒充实度最高的是IET 21577，其次是IET 21404；然而，2013年IET 21411和IET 21405的籽粒充实度最高。因此，据报道品种IET 21577和IET 21404对产生更高的粒重和收获指数更具耐受性。这项研究为筛选具有更高生产力的耐温品种提供了机会，以满足未来气候变化条件下依赖水稻地区的需求。
