Effect of Increasing Diffuse Radiation Fraction under Low Light Condition on the Grain-filling Process of Winter Wheat (Triticum aestivum L)

doi:10.3969/j.issn.1000-6362.2017.12.001

Abstract

Abstract: The solar radiation reduction along with increasing diffuse radiation fraction has been observed across the middle and lower reaches of Yangtze river in recent half century. Wheat growth and production would be influenced by the changes of solar radiation reaching the surface and its composition. In order to investigate the effect of increasing diffuse radiation fraction under decreased solar radiation condition on the grain filling process of the winter wheat （Triticum aestivum L）, two treatments with different reduction ratio of diffuse radiation fraction and similar shading rate were set in the field experiment: T1, total solar radiation shading rate was 14.10% and diffuse radiation fraction was 31.09%; T2, total solar radiation shading rate was 14.42% and diffuse radiation fraction was 39.98%, respectively; CK, no shading as control. The experiment was conducted from three leaves stage to mature stage of winter wheat. The 1000-grain weight was measured every 7 days from anthesis to mature period for 5 times totally. The Logistic model was used to simulate the grain filling process, the grain weight growing and the filling parameters. The results indicated that the grain filling time was not significantly affected by solar radiation reduction, but the 1000-grain weight was affected through decreasing grain filling rate. Under T1 treatment, the maximum filling rate, the average filling rate, the filling rate during the gradual increasing period , rapid increasing period and slow increasing period decreased, and the 1000-grain weight also decreased. Under the treatment of higher diffuse solar radiation fraction （T2 treatment）, the maximum grain filling rate, the average grain filling rate, the filling rate during gradual, rapid and slow growth periods were increased, and the grain weight was increased. This study indicated that the negative effect of solar radiation reduction on grain weight was offset by the effect of increased diffuse radiation fraction.

Key words: Diffuse solar radiation, Winter wheat, Logistic model, Grain filling parameter, 1000-grain weight

JIANG Xiao-dong, CHEN Hui-ling, JIANG Lin-lin, YANG Xiao-ya, LV Run, HUA Meng-fei, WU Ke-ren. Effect of Increasing Diffuse Radiation Fraction under Low Light Condition on the Grain-filling Process of Winter Wheat (Triticum aestivum L)[J]. Chinese Journal of Agrometeorology, 2017, 38(12): 753-760.

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