The Influence of Cropping Season on Dry Matter Partitioning and Leaf Senescence Patterns of Rice Tillers
|Keywords:||稻作區域性與期作性低產及增產措施之研究||Issue Date:||Dec-1984||Publisher:||台中：農業試驗所||Start page/Pages:||181-196||Source:||稻作區域性與期作性低產及增產措施之研究:||Abstract:||
The effect of cropping seasons on the dry matter accumulation and the leaf senescence pattern of two field-grown rice (Oryza sativa L.) genotypes were investigated throughout the ripening period. The translocation of protein and nonstructural carbohy-drate, protease and aipha-amylase activities, free amino acids and soluble sugars were determined in various leaves. The relation between the senescence pattern of leaves tissue and cropping seasons was also evaluated.
The results indicated that the total dry matter productivity in second cropping season was higher than that in first cropping season. This was attributed to the higher solar radiation and moderate air temperature in 1981 growing year. The contribution of pre-anthesis carbohydrate to final yield was 20% and 8% for first and second cropping sassons, respectively. The data also indicated that the nonstructural carbohydrate remaining in vegetative residue of second crop was higher than that of first crop, suggesting that the sink capacity was the major factor limiting rice yield. The partitioning of protein within rice tiller followed a pattern similar to that of the nonstructural carbohydrate. The higher protein content in leave tissue of second rice crops might delay the leaf senescence to some degree and thus, maintain higher assmilatory activities during ripening. Based on the results of this study, it was concluded that the major factor regulating the leaf senescence might be resided in the nutritional compound demand and supply (e. g., protein), between source and sink of rice plant.
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