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High day- and night-time temperatures affect grain growth dynamics in contrasting rice genotypes

文献类型: 外文期刊

作者: Shi, Wanju 1 ; Yin, Xinyou 2 ; Struik, Paul C. 2 ; Solis, Celymar 1 ; Xie, Fangming 1 ; Schmidt, Ralf C. 3 ; Huang, Mi 1 ;

作者机构: 1.IRRI, DAPO Box 7777, Manila, Philippines

2.Wageningen Univ & Res, Ctr Crop Syst Anal, Dept Plant Sci, POB 430, NL-6700 AK Wageningen, Netherlands

3.Bayer Crop Sci NV Innovat Ctr Res, Technol Pk 38, B-9052 Ghent, Belgium

4.Hunan Agr Univ, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China

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

6.Kansan State Univ, Dept Agron, Manhattan, KS 66506 USA

关键词: Chalkiness;grain filling;high day-time temperature;high night-time temperature;rice;starch metabolism enzymes;starch packaging

期刊名称:JOURNAL OF EXPERIMENTAL BOTANY ( 影响因子:6.992; 五年影响因子:7.86 )

ISSN: 0022-0957

年卷期: 2017 年 68 卷 18 期

页码:

收录情况: SCI

摘要: High day and night temperatures affect the rate and duration of grain filling and starch packaging differently in a developing rice grain.Rice grain yield and quality are predicted to be highly vulnerable to global warming. Five genotypes including heat-tolerant and susceptible checks, a heat-tolerant near-isogenic line and two hybrids were exposed to control (31 degrees C/23 degrees C, day/night), high night-time temperature (HNT; 31 degrees C/30 degrees C), high day-time temperature (HDT; 38 degrees C/23 degrees C) and high day- and night-time temperature (HNDT; 38 degrees C/30 degrees C) treatments for 20 consecutive days during the grain-filling stage. Grain-filling dynamics, starch metabolism enzymes, temporal starch accumulation patterns and the process of chalk formation were quantified. Compensation between the rate and duration of grain filling minimized the impact of HNT, but irreversible impacts on seed-set, grain filling and ultimately grain weight were recorded with HDT and HNDT. Scanning electron microscopy demonstrated irregular and smaller starch granule formation affecting amyloplast build-up with HDT and HNDT, while a quicker but normal amylopast build-up was recorded with HNT. Our findings revealed temporal variation in the starch metabolism enzymes in all three stress treatments. Changes in the enzymatic activity did not derail starch accumulation under HNT when assimilates were sufficiently available, while both sucrose supply and the conversion of sucrose into starch were affected by HDT and HNDT. The findings indicate differential mechanisms leading to high day and high night temperature stress-induced loss in yield and quality. Additional genetic improvement is needed to sustain rice productivity and quality under future climates.

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