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Annals of Botany 74: 503-511, 1994
© 1994 Annals of Botany Company

Effect of Water Deficit on Accumulation of Dry Matter, Carbon and Nitrogen in the Kernel of Wheat Genotypes Differing in Yield Stability

Renu Khanna-Chopra, P. S.S. Rao, M. Maheswari, Liu Xiaobing and K. S. Shivshankar

Water Technology Centre, Indian Agricultural Research Institute New Delhi-110012, India

Water stress effects on accumulation of dry matter, carbon and nitrogen in grains were analysed in varieties and species of wheat differing in yield stability. Variable water environments were generated using a line source sprinkler system. Although large fluctuations occurred in the water potentials of the flag leaf and ear, grain growth remained relatively buffered under moisture stress. Developing grains were at a lower moisture level throughout grain growth in plants subjected to moisture stress relative to the unstressed plants. Carbon content decreased more than the nitrogen content in the stressed grains of the species and varieties. Reduction in the duration of grain growth and the rate of dry weight accumulation induced by water stress was more prominent in T. aestivum var. C306 and T. sphaerococcum. Grain yield was reduced significantly under water stress, the maximum being in the high yielding cultivar HD2329. Both grain number and grain weight were reduced in response to stress, the extent of reduction being different in different genotypes.Copyright 1994, 1999 Academic Press

Water deficit, yield stability, C and N accumulation, heat degree days


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I. F. WARDLAW
Interaction Between Drought and Chronic High Temperature During Kernel Filling in Wheat in a Controlled Environment
Ann. Bot., October 1, 2002; 90(4): 469 - 476.
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