Mapping quantitative trait loci for heat tolerance at anthesis in rice using chromosomal segment substitution lines

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  • Zhao Lei
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences College of Agronomy, Jiangxi Agricultural University Key Laboratory of Agriculture Responding to Climate Change
  • Lei Jianguo
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences College of Agronomy, Jiangxi Agricultural University Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education
  • Huang Yingjin
    College of Agronomy, Jiangxi Agricultural University Key Laboratory of Agriculture Responding to Climate Change Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education
  • Zhu Shan
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences College of Agronomy, Jiangxi Agricultural University Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education
  • Chen Hongping
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences
  • Huang Renliang
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences
  • Peng Zhiqin
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences College of Agronomy, Jiangxi Agricultural University Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education
  • Tu Qinghua
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences Jiangxi Seed Administration
  • Shen Xianhua
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences
  • Yan Song
    Rice National Engineering Laboratory (Nanchang), Jiangxi Provincial Key Laboratory of Rice Physiology and Genetics, Rice Research Institute, Jiangxi Academy of Agricultural Sciences

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説明

To study the genetic basis of heat tolerance at anthesis, a set of chromosome segment substitution lines (CSSLs) derived from Sasanishiki (japonica ssp. heat susceptible) and Habataki (indica spp. heat tolerant) were used for analysis across three high temperature environments. Spikelet fertility (SF), daily flowering time (DFT) and pollen shedding level (PSL) under high temperature (HT) were assessed. Eleven related QTLs were detected, of which, two QTLs qSFht2 and qSFht4.2 for spikelet fertility were identified on chromosomes 2 and 4. Four QTLs qDFT3, qDFT8, qDFT10.1 and qDFT11 for daily flowering time were detected on chromosomes 3, 8, 10 and 11. The other five QTLs qPSLht1, qPSLht4.1, qPSLht5, qPSLht7 and qPSLht10.2 on chromosomes 1, 4, 5, 7 and 10, respectively, were found had effects both on spikelet fertility and pollen shedding level. Of the 11 QTLs, 8 were overlapped with QTLs reported by others, 3 QTLs qPSLht4.1, qPSLht7 and qPSLht10.2 identified in this study were novel. The stability of qPSLht4.1 was further verified at different temperatures, which could be used to improve the pollen shedding and pollen growth on stigma for rice heat-tolerance breeding.

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