The tolerance of wheat to high temperatures during reproductive growth, 1. Survey procedures and general response patterns
1989
Wardlaw, I.F. | Dawson, I.A. | Munibi, P. | Fewster, R. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Plant Industry)
The overall response to temperature, based on phototron trials on 28 cultivars from Afghanistan, Australia, Europe, India, Mexico, the Middle East and north Africa, demonstrated the sensitivity of grain number to high temperature during booting and the sensitivity of weight per grain to high temperature after anthesis. The data indicate a general reduction in yield per ear of 3-4 percent for each 1 deg.C rise in temperature above a mean of 15 deg.C. The response to temperature varied with the stage of development, and some cultivars sensitive to high temperature at booting were amongst the least sensitive during grain development. Also, the temperature response was found to be dependent on light, with an enhanced sensitivity to high temperature at low irridiance. The data did not reveal any clear relationship between the response to temperature, and weight per grain, the number of grains in a head, or grains per spikelet of control plants.
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