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High day- and night-time temperatures affect grain growth dynamics in contrasting rice genotypes
- Source :
- Journal of Experimental Botany, 68(18), 5233-5245, Journal of Experimental Botany, Journal of Experimental Botany 68 (2017) 18
- Publication Year :
- 2017
-
Abstract
- High day and night temperatures affect the rate and duration of grain filling and starch packaging differently in a developing rice grain.<br />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 °C/23 °C, day/night), high night-time temperature (HNT; 31 °C/30 °C), high day-time temperature (HDT; 38 °C/23 °C) and high day- and night-time temperature (HNDT; 38 °C/30 °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.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Hot Temperature
Sucrose
Crop Physiology
grain filling
Genotype
Edible Grain
Physiology
Starch
high night-time temperature
Plant Science
Oryza
01 natural sciences
03 medical and health sciences
chemistry.chemical_compound
starch metabolism enzymes
Plant-Environment Interactions
Amyloplast
Biomass
high day-time temperature
biology
Chemistry
Crop yield
rice
Temperature
food and beverages
Chalkiness
biology.organism_classification
PE&RC
Research Papers
Horticulture
Grain growth
030104 developmental biology
Agronomy
Seeds
Centre for Crop Systems Analysis
starch packaging
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 00220957
- Volume :
- 68
- Issue :
- 18
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....7f934ed13e39ed4aba1e82c5f8808e98