A survey of the effects of high temperature during grain filling on yield and quality of 75 wheat cultivars
1995
Stone, P.J. | Nicolas, M.E. (Melbourne Univ., Parkville (Australia). Centre for Crop Improvement)
The responses of 75 cultivars of wheat to a short (3 day) period of very high temperature (40 deg C max.) applied at either 10 or 30 days after anthesis were examined under controlled conditions. The effect of high temperature on a number of yield (grain number, individual kernel mass and N per kernel) and quality components (protein composition, apparent amylose content and noodle swelling power) is described for the sample population and for a number of varieties which were either particularly heat tolerant or sensitive. Genotypic variation of response to high temperature of the order of 20 percent was recorded for the majority of yield and quality components. The fact that responses of this magnitude were caused by exposure to high temperatures lasting only 5 to 6 percent of the grain filling period demonstrates the extent to which short periods of very high temperature may affect wheat yield and quality.
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