干旱是制约新疆玉米生产的首要因素。本研究以包含384个玉米杂交种(F_(1))的群体为试验材料,开展F_(1)群体田间耐旱性鉴定,然后从F_(1)群体中选择耐旱性优异的材料,用各自骨干亲本进行回交,采用FarmCPU(fixed and random model circulat...干旱是制约新疆玉米生产的首要因素。本研究以包含384个玉米杂交种(F_(1))的群体为试验材料,开展F_(1)群体田间耐旱性鉴定,然后从F_(1)群体中选择耐旱性优异的材料,用各自骨干亲本进行回交,采用FarmCPU(fixed and random model circulating probability unification)进行全基因组关联分析。结果表明:与常规灌溉相比,干旱胁迫条件下玉米开花—吐丝间隔期(ASI)变长、株高变低、穗长变短,差异达到极显著水平;利用全基因组关联分析,共鉴定到16个耐旱性状(REC)关联的位点。展开更多
[Objective] This study aimed to investigate the correlations between the drought tolerance and plant traits of hybrid rice, so as to provide theoretical basis for the breeding of drought-tolerant rice varieties. [Meth...[Objective] This study aimed to investigate the correlations between the drought tolerance and plant traits of hybrid rice, so as to provide theoretical basis for the breeding of drought-tolerant rice varieties. [Method] In the field experiment in 2011, 30 hybrid rice cultivars were grown under three different conditions： drought at til ering stage, drought at panicle initiation stage and control （keeping shal ow wa-ter during the whole growth period）. Then, the main plant traits were measured, and the related drought tolerance indices were calculated. In 2012, 16 hybrid rice culti-vars were grown in pots under drought and normal water conditions respectively. And their main plant traits were measured, and the related drought tolerance indices were also calculated. [Result] The water content in soil under drought stress at til ering stage was nearly 60%, and that under drought stress at panicle initiation stage was 80%. Such low water content significantly reduced the rice yield. The cultivars with large panicle and great root growth potential had strong drought toler-ance at panicle initiation stage. Under drought stress, the cultivars with higher yield had stronger tolerance to drought. The drought tolerance indices at til ering stage had no correlations with those at panicle initiation stage. Under normal water condi-tions, the cultivars with smal er 1 000-grain weight had stronger tolerance to drought . Under drought stress , the cultivars with smal er 1 000-grain weight and higher grain yield had stronger tolerance to drought. [Conclusion] Among al the rice cultivars tested in the present study, D You 6511, Taiyou 99, Nei 5 You 317, Neixiangyou 18, Yixiangyou 7633, Tianyouhuazhan, II You 615, Neixiang 5306, Chuanguyou 7329 and Neixiang 7539 exhibited better tolerance to drought, and thus can be promoted in production.展开更多
文摘干旱是制约新疆玉米生产的首要因素。本研究以包含384个玉米杂交种(F_(1))的群体为试验材料,开展F_(1)群体田间耐旱性鉴定,然后从F_(1)群体中选择耐旱性优异的材料,用各自骨干亲本进行回交,采用FarmCPU(fixed and random model circulating probability unification)进行全基因组关联分析。结果表明:与常规灌溉相比,干旱胁迫条件下玉米开花—吐丝间隔期(ASI)变长、株高变低、穗长变短,差异达到极显著水平;利用全基因组关联分析,共鉴定到16个耐旱性状(REC)关联的位点。
基金Supported by Science and Technology Project for National Food Production(2011BAD16BO5-1)Special Fund for Scientific Research in the Public Interest(201203029)+2 种基金Financial Genetic Engineering Program of Sichuan ProvinceSouthwestern China Rice Innovation System ProjectSichuan Provincial Financial Program~~
文摘[Objective] This study aimed to investigate the correlations between the drought tolerance and plant traits of hybrid rice, so as to provide theoretical basis for the breeding of drought-tolerant rice varieties. [Method] In the field experiment in 2011, 30 hybrid rice cultivars were grown under three different conditions： drought at til ering stage, drought at panicle initiation stage and control （keeping shal ow wa-ter during the whole growth period）. Then, the main plant traits were measured, and the related drought tolerance indices were calculated. In 2012, 16 hybrid rice culti-vars were grown in pots under drought and normal water conditions respectively. And their main plant traits were measured, and the related drought tolerance indices were also calculated. [Result] The water content in soil under drought stress at til ering stage was nearly 60%, and that under drought stress at panicle initiation stage was 80%. Such low water content significantly reduced the rice yield. The cultivars with large panicle and great root growth potential had strong drought toler-ance at panicle initiation stage. Under drought stress, the cultivars with higher yield had stronger tolerance to drought. The drought tolerance indices at til ering stage had no correlations with those at panicle initiation stage. Under normal water condi-tions, the cultivars with smal er 1 000-grain weight had stronger tolerance to drought . Under drought stress , the cultivars with smal er 1 000-grain weight and higher grain yield had stronger tolerance to drought. [Conclusion] Among al the rice cultivars tested in the present study, D You 6511, Taiyou 99, Nei 5 You 317, Neixiangyou 18, Yixiangyou 7633, Tianyouhuazhan, II You 615, Neixiang 5306, Chuanguyou 7329 and Neixiang 7539 exhibited better tolerance to drought, and thus can be promoted in production.
