葉溫 및 光强度에 따른 大豆品種間의 光合成能力에 관한 硏究

This study was conducted to investigate the Net photosynthesis and respiration rates among the varieties of Soybean(Eunha, Pangsa and Paldal that have high yields) at various leaf temperature and light intensity at the stage of V 5 . The relations between the Net photosynthesis rate and SLW(specific leaf weight) and chlorophyll content were also investigated. 1. Net photosynthesis rates at 25℃ were 21.5㎎dm -2 h -1 in cv. Eunha, 20.2㎎dm -2 h -1 in cv. Pangsa and 18.5㎎dm -2 h -1 in cv. Paldal. 2. Most cultivars of Soybean showed the maximum rates of Net photosynthesis at 25℃, especially in cv. Eunha. Also Net photosynthesis rates differed depending on the leaf shape. Long leaf shape(cv. Eunha) was better than round leaf shape(cv. Paldal) in Net photosynthesis rate. 3. Respiration rates of leaves in Eunha, Pangsa and Paldal were 0.56㎎dm -2 h -1 at 15℃, 0.79㎎dm -2 h -1 at 20℃, 1.15㎎dm -2 h -1 at 25℃ and 1.37㎎dm -2 h -1 at 30℃. 4. Specific leaf weight were 3.1㎎/㎠ in Pangsa, 3.5㎎/㎡ in Eunha and Paldal. No significant difference were showed in net photosynthesis rates and specific leaf weight. 5. Leaf chlorophyll content were 2.48㎍/gF.W. in Eunha, 2.19㎍/gF.W. in Pangsa and 1.67㎍/gF.W. in Paldal. Significant difference were showed in Net photosynthesis rates and Leaf chlorophyll content. 6. The estimated compensation points at which net photosynthesis approached zero were 10μ Em -2 s -1 in Eunha, Pangs a, and Paldal at 15℃. The compensation point in cv. Eunha at 20℃ was 12μ Em -2 s -1 while 13μEm -2 s -1 in Pangsa and Paldal. The compensation point in cv. Paldal at 25℃ was 18μEm -2 s -1 while 16μEm -2 s -1 in Eunha and Pangsa. The compensation point in cv. Paldal at 30℃ was 23μEm -2 s -1 in Paldal while 22μEm -2 s -1 in Eunha and Pangsa.