PHOTOSYNTHESIS OF COTYLEDONS OF SOYBEAN SEEDLINGS
PHOTOSYNTHESIS OF COTYLEDONS OF SOYBEAN SEEDLINGS
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DOI：
10.1111/j.1469-8137.1986.tb02899.x
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发表时间：
1986-11-01
期刊：
影响因子：
9.4
通讯作者：
SMITH, DL
中科院分区：
文献类型：
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作者：
HARRIS, M;MACKENDER, RO;SMITH, DL
在播种后第四天和此后每隔三天测量一次大豆 (L.) Merrill 幼苗上每个叶器官的净光合作用速率，直到子叶脱落后 5 天。还测量了整个幼苗的暗呼吸速率。使用存在的每个叶器官的净二氧化碳同化率和整个幼苗的暗呼吸率的总和来估计每日净碳同化率。与叶子相比，子叶的光合作用速率非常低，无论是单位叶绿素还是单位面积的表达。尽管子叶对幼苗同化的贡献在幼苗整个一生中仍然很小，但足以平衡幼苗在叶片展开前 7 至 10 天的呼吸损失。仅当第10天初生叶光合作用开始时，二氧化碳预算才会显着增加。随着第一、第二和第三三叶叶的扩张，净同化作用迅速增加。
The rate of net photosynthesis in each of the foliar organs present on seedlings of Glycine max (L.) Merrill was measured by infrared gas analysis on the fourth day after sowing and every third day thereafter until 5 d after cotyledon abscission. Dark respiration rates for the whole seedling were also measured. Estimates of the daily net carbon assimilation were made using the sum of the net CO2 assimilatory rates for each foliar organ present and the dark respiration rate for the whole seedling. Rates of cotyledon photosynthesis were very low in comparison to the leaves, whether expressed per unit chlorophyll or unit area. Although the cotyledon contribution to seedling assimilation remained small throughout their lifetime, it was enough to balance seedling respiratory losses during days 7 to 10 prior to leaf expansion. Marked increases in the CO2 budget only occurred once primary leaf photosynthesis began on day 10. Net assimilation then increased rapidly as first, second and third trifoliate leaves expanded.