|Title:||一、二期作水稻穀粒充實特性與產量構成要素之關係||Other Titles:||Grain-filling Characteristics and Its Relation to Yield Components in the First and Second Rice Crops||Authors:||朱鈞
|Issue Date:||Dec-1984||Publisher:||農業試驗所||Start page/Pages:||165-179||Source:||農業試驗所特刊;第16號||Abstract:||
In the first crop of 1980 and second crop of 1981, eight rice cultivars, including both japonica and indica types, were grown under field conditions to determine the differences in the rate and duration of grain-filling, as well as other filling characters and their relationships to grain yield and yield components. A further objective was to find out whether the filling rate or duration was more closely correleted to grain yield.
The cubic polynomial regression model was found to be useful for the measurement of grain-filling characters (R2>0.95 for all cultivars). Grain-filling rate and duration as well as other grain-filling parameters varied among cultivars during the two different growing seasons. It was shown that the grain-filling rate of the first crop was greater than that of the second crop. Correlation analysis indicated that a significant positive correlation existed between the grain-filling rate and the panicle weight in the first crop. A significant positive relationship was found between the panicle weight and grain-filling duration in the second crop. Although this was associated with a longer duration in the second crop, the failure to obtain any compensating increase in the rate of dry matter accumulation resulted in a much reduced panicle weight.
These results indicated that grain-filling rate was more important than duration for grain development in both growing seasons. It is suggested that there is potential for higher rice yield via genetic improvement of increasing the grain-filling rate.
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