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  • 刘刚,蔡海亚,贾海涛,等.非洲水稻种质SDWG005苗期耐热生理基础[J].植物遗传资源学报,2021,22(3):646-653.    [点击复制]
  • LIU Gang,CAI Hai-ya,JIA Hai-tao,et al.Physiological Basis of Heat Tolerance of African Rice Germplasm SDWG005 at Seedling Stage[J].植物遗传资源学报,2021,22(3):646-653.   [点击复制]
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非洲水稻种质SDWG005苗期耐热生理基础
刘刚, 蔡海亚, 贾海涛, 张硕, 焦春海
0
(湖北省农业科学院粮食作物研究所/湖北省粮食作物种质创新与遗传改良重点实验室)
摘要:
发现并鉴定水稻耐热新种质,培育耐热新品种,是降低高温热害对水稻生产影响的重要措施之一。前期研究表明,9311为热敏感种质,而非洲水稻种质SDWG005为强耐热种质。本研究在苗期,对9311和SDWG005进行了连续5天的高温胁迫(42 ℃/28 ℃,12 h/12 h),并对二者高温胁迫前后的叶片表型、显微结构及其他生理指标进行了测定和分析。结果表明:在高温胁迫和正常生长的大部分测定时间点,SDWG005的叶片及显微结构、丙二醛含量和超氧化物歧化酶活性没有显著变化,可溶性糖和脯氨酸含量极显著增加,而9311的叶片出现枯萎、丙二醛和脯氨酸含量显著或极显著增加、可溶性糖含量(仅在高温胁迫的第一天显著增加)无显著变化、超氧化物歧化酶活性显著降低;高温胁迫对SDWG005苗期的光合作用没有显著影响,却显著抑制了9311苗期的光合作用;SDWG005和9311的叶绿素含量在部分测定时间点表现为显著或极显著增加;SDWG005苗期在高温胁迫下生物量积累增加。本研究揭示了非洲水稻SDWG005苗期耐热性产生的形态和生理学基础,为我们进一步利用该资源进行水稻耐热性育种提供了理论依据。
关键词:  非洲稻  SDWG005  苗期  耐热生理
DOI:10.13430/j.cnki.jpgr.20200921002
投稿时间:2020-09-21修订日期:2021-02-07
基金项目:湖北省自然科学基金(2019CFB579);中国博士后科学基金(2019M652607)
Physiological Basis of Heat Tolerance of African Rice Germplasm SDWG005 at Seedling Stage
LIU Gang, CAI Hai-ya, JIA Hai-tao, ZHANG Shuo, JIAO Chun-hai
(Grain Crops Institute, Hubei Academy of Agricultural Sciences/Hubei Key Laboratory of Grain Crops Germplasm and Genetic Improvement)
Abstract:
Identification of new heat tolerant rice germplasm and breeding of new heat tolerant varieties are important for lessening the impacts of heat stress on rice production. Our previous study showed that rice 9311 was heat sensitive, while rice SDWG005 from Africa was heat tolerant. In this study, leaf morphology, microstructure and other physiological indexes of 9311 and SDWG005 were observed, tested and analyzed during or after 5 consecutive days treatment of high temperature stress (42℃/28℃, 12 h/12 h). The results showed that there were no significant changes in leaf morphology and microstructure, MDA content and superoxide dismutase content of SDWG005 at most time points of high temperature stress as compared with normal growth, and the content of soluble sugar and leaf proline increased significantly, whereas the leaves of 9311 were wilting after high temperature stress, the content of malondialdehyde and proline increased significantly or extremely significantly, the soluble sugar did not change significantly, and the activity of superoxide dismutase decreased significantly. The high temperature stress had no significant effect on photosynthesis of SDWG005 seedlings, but inhibited the photosynthesis of 9311 seedlings significantly. The chlorophyll content of SDWG005 and 9311 increased significantly or extremely significantly at some time points, and the biomass accumulation of SDWG005 increased under high temperature stress. The morphological and physiological basis of heat tolerance of SDWG005 is discussed in the present study, which will be helpful for breeding rice varieties with high heat tolerance using SDWG005 in future.
Key words:  African rice  SDWG005  seedling  heat tolerance

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