|Title:||大豆植株營養要素之累積與分佈 I.全生育期非構造性碳水化合物與氮素濃度之變化||Other Titles:||Accumulation and Distribution of Nutrients in Soybeans I. Changes of TNC and N Concentrations during Plant Development||Authors:||王強生
|Issue Date:||3-Sep-1984||Publisher:||農業試驗所||Journal Volume:||33||Journal Issue:||3||Start page/Pages:||247-256||Source:||中華農業研究||Abstract:||
本試驗以高雄3號(Kaohsiung No.3)與十石(Shih-Shih)二大豆品種爲材料，測定重要生育期值株各部位（葉片、葉柄、莖桿、根、莢果壁與種子）非構造性碳水化合物(TNC)與氮素濃度，探討春(1982)、夏(1981)作大豆由於比他重要營養要素濃度之變化所代表之生理意義及與產量之關係。試驗結果顯示春作大豆營養器官於種子迅速充實期前均有較高的TNC濃度，而於種子迅速充實後大幅下降，成熟時各部位TNC濃度反較夏作低，顯示春作大豆對營養器官所貯存TNC的依賴程度較大，可能是因爲春作大豆葉片較早老化、脫落而導致現階段光合生產不足，TNC之供給成爲產量的限制因子。Two soybean cultivars, Kaohsiung No. 3 (KS-3) and Shih-Shih (SS), were grown in the summer crop of 1981 and spring crop of 1982 at the experimental farm of Taiwan Agricultural Research Institute. Samples were taken at stages of soybean development. Concentrations of total nonstructural carbohydrates (TNC) and nitrogen (N) were determined on different plant parts including leaf blade, petiole, stem, root, pod wall and seed. TNC concentrations in the vegetative organs were very high and the decreases during seed-filling were also extremely prominent in the spring crop. In view of the lower TNC concentration in the senescing leaf blades and lower grain yield of the spring crop, insufficient supply of photosynthetic assimilates to the seeds was proposed as a result of early leaf senescence. Vegetative organs of soybeans grown in the summer crop had lower N concentrations than those grown in the spring crop. The decreases of N concentration in vegetative organs were apparent during seed-filling period, indicating the redistribution of N from vegetative organs to the seeds. Analysis of leaf blades sampled just before abscission showed N concentration of 2.5% in the summer and as high as 3.6% in the spring crop. The high N concentration in the senesced leaf blades indicated the uneffectiveness of retranslocating N to the developing seeds and the unavailability of N to the maintenance of physiological activities of the leaf blades. Changes of TNC and N concentrations in the two cultivars were similar within crop but were different between crop seasons, suggesting the influences of environmental factors were prominent.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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