大豆不同節位碳水化合物供需關係之研究

Study on the Relationship between Carbohydrate Supply and Demand at Different Nodes Soybean Plant

丁文彥(Wen-Yann Ding) ； 朱德民(Teh-Ming Chu)

《花蓮區農業改良場研究彙報》 5期 (1989/05) Pp. 5-6

摘要

為探討大豆植株不同節位碳水化合物供需之關係，做為改善作物生產能力之依據，本試驗以大連豆為供試品種，於73年9月在台中中興大學農場進行，試驗方法為自植株開花後每隔一週調查不同節位葉片及莢果種子生理性狀及成分含量變化，測定大豆植株不同節位供源葉葉片和積儲種子之間的關係，以期了解莢果種子發育中養分的供需。試驗結果顯示，植株上部各節位積儲大小（sinksize）較大，需要養分較多，上部各節位葉片活性也較大，碳水化合物濃度較大，以配合養分的供需。大豆在開花後第5週，種子快速充實期需要大量光合產物，葉片內光合作用所產生的物質似乎已不夠供給，必須由葉片中輸出養分至種子。愈高節位葉片中非結構性碳水化合物（TNC）輸出愈大，葉片內TNC濃度降低幅度也愈大，並且表現出節位發生的時序差異。

並列摘要

In order to study the relationship between source and sink organs at different nodes of soybean plants during reproductive growth period, Dah-liarn cultivar was grown for the experiment in the fall crop of 1984. Leaves and pods were taken weekly from different nodes, nonstructural carbohydrate was determined. In view of source-sink relationship on the whole plant, upper nodes had higher sink size. The leaves at upper nodes could maintain high physiological activities, and supply more assimilate and nutrient to meet the requirement. The results indicated that non-structural carbohydrate was translocated to seed from leaves, to meet the demand of the developing seeds at rapid seed filling period, and the translocation rate was higher at higher nodes on the plant; also indicated that differences in physiological activities due to sequential ontogeny among different nodes were found.