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《Acta Agronomica Sinica》 1982-02
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STUDY ON THE GRAIN FILLING OF WHEAT

Chang Xiaolong (Sichuan Agricultural College,Yaan)  
Results of 2-year study on the grain filling of wheat showed as fol-lows:The pattern of the growth of wheat kernel presented in a S-shapedcurve.It consisted of three stages of seed formation,filling and ripen-ing.The dry weight of kernel varied with different varieties and withthe same variety in different years.It was mainly influenced by the fil-ling rate and the duration of the filling stage.However,filling rateshowed much influence on the increase of kernel weight than that of theduration of filling.The dry weight of kernel had a significantly positive correlation withthe maximum value of the dry weight of the vegetative organ per kernel(DWVOK),but negatively correlated with the decreasing of DWVOK.Therefore,the filling index of kernel could be used as a criterion tomeasure this relation,as it accurately reflected the characters of theaccumulation of the nutritious substance of plant and its transformationto kernels to determine the condition of the grain filling and its poten-tiality for filling.When the sink was not contented with the source,the kernel show-ed wrinkled.Using filling index to determine the balance of source andsink,fhe reliable data could be obtained.It showed that between theideal balance(limit=1)and the absolute balance(limit=0),thegreater the filling index,the higher the balance of the sink and the sou-rce,and the fuller the seeds.The filling index had little relation withthe maximum volume of sink,but significantly correlated with the maxi-mum value of DWVOK.
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