文献类型： 外文期刊

作者： Ye, Changrong ¹ ; Ishimaru, Tsutomu ² ; Lambio, Leslie ³ ; Li, Le ¹ ; Long, Yu ¹ ; He, Zhizhou ¹ ; Htun, Than Myint ⁴ ; Tang, Shunxue ¹ ; Su, Zhenxi ² ;

作者机构： 1.Huazhi Biotechnol Co Ltd, 618 Heping Rd, Changsha 410125, Hunan, Peoples R China

2.Japan Int Res Ctr Agr Sci JIRCAS, 1-1 Ohwashi, Tsukuba, Ibaraki 3058686, Japan

3.Int Rice Res Inst, PABO Box 7777, Manila, Philippines

4.Yezin Agr Univ YAU, Div New Genet, Nay Pyi Taw 15013, Myanmar

5.Yunnan Acad Agr Sci, Inst Food Crops, 2238 Beijing Rd, Kunming 650205, Yunnan, Peoples R China

6.Natl Agr & Food Res Org, Cent Reg Agr Res Ctr, Hokuriku Res Stn, Niigata 9410193, Japan

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.574； 五年影响因子：5.662 ）

ISSN： 0040-5752

年卷期： 2022 年 135 卷 4 期

页码：

收录情况： SCI

摘要： Key message This study demonstrated that pyramiding of early morning flowering and heat tolerance QTLs (qEMF3 and qHTSF4.1) in rice is an efficient approach to maintain high spikelet fertility under high-temperature stress at flowering stage. High temperature at flowering stage of rice causes low spikelet fertility and low yield. To cope with high-temperature stress brought by climate change, two strategies were proposed to develop heat-resilient rice varieties. One is to escape the high temperature by flowering early in the morning, another is to enhance tolerance to high-temperature stress per se. Two promising QTLs for early morning flowering (qEMF3) and heat tolerance (qHTSF4.1) were introgressed into IR64 background, and Near isogenic lines (NILs) IR64 + qEMF3 (IR64EMF3) and IR64 + qHTSF4.1 (IR64HT4) were developed in previous studies. In this study, a QTL pyramiding line IR64 + qHTSF4.1 + qEMF3 (IR64HT4EMF3) was developed by marker-assisted selection of the progenies of previous NILs. The NILs were subjected to different high-temperature regimes in the indoor growth chambers and different locations in the field. In the indoor growth chambers, when high temperature starts early (before 11:00 am), IR64HT4 and IR64HT4EMF3 had higher spikelet fertility than IR64EMF3; when high temperature comes later (after 11:00 am), IR64EMF3 and IR64HT4EMF3 had higher spikelet fertility than IR64HT4. The flowering pattern of the IR64HT4EMF3 was earlier than IR64HT4, but similar to IR64EMF3 in the glasshouse, field and indoor growth chambers. IR64HT4EMF3 showed higher spikelet fertility than IR64EMF3 and IR64HT4 in the field in the Philippines. Thus, combination of early morning flowering and heat tolerance QTLs is an elegant breeding strategy to cope with future extreme climate.