Scholarlink

<p>In rice, higher temperature (&gt; 33&#xa0;°C) during anthesis and fertilization impacts spikelet fertility and thereby affecting grain-filling and&#xa0;yield. The genus <i>Oryza</i> exhibit variability, at species level, for flower opening time (FOT) trait. Understanding this trait in rice wild relatives will help identify potential wild species that could be used in wide-hybridization program for introgression of this valuable trait for multiple utilities. The FOT trait was studied morphologically in 15 <i>Oryza</i> taxa that were in anthesis at the wild rice garden jointly maintained&#xa0;by ICAR-CRRI and ICAR-NBPGR-Base Center, Cuttack; and the extreme phenotype species’ FOT variability was validated at ICAR-NBPGR-Regional Station, Thrissur. Among the <i>Oryza</i> species studied, the earliest diurnal FOT was observed in <i>O. granulata</i> (05:30 AM). The wild relatives whose FOT were found to be earlier than the cultivated rice were: <i>O. meyeriana</i>, <i>O. minuta</i>, <i>O. alta,</i> and <i>O. latifolia</i>. These were prospective species as sources for FOT trait introgression to induce early morning flowering (EMF). Species like <i>O. longistaminata</i> and <i>O. australiensis</i> that flowers late afternoon (1–4 PM) can be a promising source for restoring fertility in TGMS-based 2-line hybrids (RFiTH) which otherwise might fail to set seeds due to higher diurnal temperature at anthesis and fertilization. Our studies identified these seven species as promising resource for introgression of genes or quantitative trait loci (QTL) associated for the FOT trait variability, EMF and RFiTH, in cultivated rice to overcome the effect of high temperature on spikelet fertility and thereby imparting climate resilience in cultivated rice.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Flower opening time (FOT) trait variability in wild rice species for heat stress resilience

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月4日

查看全文
  • Samiksha Rai,
  • Dipti Ranjan Pani,
  • Mridul Chakraborti,
  • Pradheep Kanakasabapathi,
  • Parimalan Rangan

摘要

In rice, higher temperature (> 33 °C) during anthesis and fertilization impacts spikelet fertility and thereby affecting grain-filling and yield. The genus Oryza exhibit variability, at species level, for flower opening time (FOT) trait. Understanding this trait in rice wild relatives will help identify potential wild species that could be used in wide-hybridization program for introgression of this valuable trait for multiple utilities. The FOT trait was studied morphologically in 15 Oryza taxa that were in anthesis at the wild rice garden jointly maintained by ICAR-CRRI and ICAR-NBPGR-Base Center, Cuttack; and the extreme phenotype species’ FOT variability was validated at ICAR-NBPGR-Regional Station, Thrissur. Among the Oryza species studied, the earliest diurnal FOT was observed in O. granulata (05:30 AM). The wild relatives whose FOT were found to be earlier than the cultivated rice were: O. meyeriana, O. minuta, O. alta, and O. latifolia. These were prospective species as sources for FOT trait introgression to induce early morning flowering (EMF). Species like O. longistaminata and O. australiensis that flowers late afternoon (1–4 PM) can be a promising source for restoring fertility in TGMS-based 2-line hybrids (RFiTH) which otherwise might fail to set seeds due to higher diurnal temperature at anthesis and fertilization. Our studies identified these seven species as promising resource for introgression of genes or quantitative trait loci (QTL) associated for the FOT trait variability, EMF and RFiTH, in cultivated rice to overcome the effect of high temperature on spikelet fertility and thereby imparting climate resilience in cultivated rice.