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Truncation of grain filling in wheat (Triticum aestivum) triggered by brief heat stress during early grain filling: association with senescence responses and reductions in stem reserves
- Source :
- Functional plant biology : FPB. 43(10)
- Publication Year :
- 2015
-
Abstract
- Short heat waves during grain filling can reduce grain size and consequently yield in wheat (Triticum aestivum L.). Grain weight responses to heat represent the net outcome of reduced photosynthesis, increased mobilisation of stem reserves (water-soluble carbohydrates, WSC) and accelerated senescence in the grain. To compare their relative roles in grain weight responses under heat, these characteristics were monitored in nine wheat genotypes subjected to a brief heat stress at early grain filling (37°C maximum for 3 days at 10 days after anthesis). Compared with the five tolerant varieties, the four susceptible varieties showed greater heat-triggered reductions in final grain weight, grain filling duration, flag leaf chla and chlb content, stem WSC and PSII functionality (Fv/Fm). Despite the potential for reductions in sugar supply to the developing grains, there was little effect of heat on grain filling rate, suggesting that grain size effects of heat may have instead been driven by premature senescence in the grain. Extreme senescence responses potentially masked stem WSC contributions to grain weight stability. Based on these findings, limiting heat-triggered senescence in the grain may provide an appropriate focus for improving heat tolerance in wheat.
- Subjects :
- 0106 biological sciences
Ecophysiology
Senescence
food and beverages
04 agricultural and veterinary sciences
Plant Science
Biology
Grain filling
Photosynthesis
01 natural sciences
Grain size
Heat stress
Agronomy
Anthesis
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Sugar
Agronomy and Crop Science
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14454416
- Volume :
- 43
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Functional plant biology : FPB
- Accession number :
- edsair.doi.dedup.....5189abf7fa579e68613f6edb84b126bf