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Rate and Duration of Grain Filling in Durum Wheat Cultivars¹

Eleven cultivars of durum wheat (Triticum turgidum L.) were grown under rainfed and irrigated conditions in order to determine if differences in rate of grain filling and duration exist and to study their relationships with grain weight. A cubic polynomial was used to describe the relationship between grain weight and time from anthesis. Rate and duration of grain filling were obtained from the fitted curve.

Cultivars differed significantly in rate of grain filling, duration of grain filling, and grain weight. Rate and duration of grain filling were positively associated with final grain weight. There appeared to be little genetic association between rate of grain filling and duration of grain filling. Results suggested that it should be possible to simultaneously improve rate of grain filling and grain weight without lengthening duration of grain filling.

Key Words: Grain weight • Polynomial regression • Triticum turgidum L

² Postdoctorate fellow, Crop Development Centre, professor, Crop Science Dep., and senior research scientist, Crop Development Centre, respectively. G. Gebeyehou currently research officer, Inst. Agric. Res., Box 2003, Addis Abada, Ethiopia

Received for publication April 8, 1981.

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