Evaluation of Grain Filling Rate and Duration in Bread and Durum Wheat, under Heat Stress after Anthesis

Bread and durum wheat genotypes were submitted to heat stress during the grain filling period, and relationships between grain weight and accumulated time from anthesis until maturity, using days after anthesis and growing degree days, were described by cubic polynomials. Maximum grain weight and th...

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Bibliographic Details
Published in:Journal of agronomy and crop science (1986) 2009-04, Vol.195 (2), p.137-147
Main Authors: Dias, A.S, Lidon, F.C
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
air temperature
Biological and medical sciences
durum wheat
filling period
flowering
Fundamental and applied biological sciences. Psychology
grain filling rate and duration
grain weight
heat stress
heat sums
high temperatures
mathematical models
seed development
species differences
Triticum aestivum
Triticum aestivum L
Triticum turgidum ssp. durum
Triticum turgidum subsp. durum
weight
wheat
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Summary:Bread and durum wheat genotypes were submitted to heat stress during the grain filling period, and relationships between grain weight and accumulated time from anthesis until maturity, using days after anthesis and growing degree days, were described by cubic polynomials. Maximum grain weight and the duration and rate of grain filling were estimated from the fitted curves. It was found that bread and durum wheat exposure to high temperatures significantly decreased grain weight and hastens physiological maturity (shortening the grain filling period). High temperatures significantly affected the rate (on a growing degree day basis) and duration (on Julian day units) of grain filling. The grain filling rate, on a thermal time basis, was positively associated with the final grain weight and the estimated maximum grain weight. The duration of grain filling does not appear to be a limiting factor for genotype grain weight stability, being mainly fixed by temperature. Grain weight of the controlled plants was positively correlated with the final and maximum grain weight of heat stressed plants. It was concluded that a high grain filling rate and a high potential grain weight are major traits that can be useful to improve heat tolerance of Triticum under Mediterranean environments.
ISSN:0931-2250
1439-037X
DOI:10.1111/j.1439-037X.2008.00347.x