Effects of phosphate deficiency on photosynthesis and accumulation of starch and soluble sugars in 1-year-old seedlings of maritime pine (Pinus pinaster Ait)
Effects of phosphate deficiency on photosynthesis and accumulation of starch and soluble sugars in 1-year-old seedlings of maritime pine (Pinus pinaster Ait)
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DOI：
10.1051/forest:19960401
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发表时间：
1996-01-01
期刊：
影响因子：
--
通讯作者：
Saur, E
中科院分区：
文献类型：
--
作者：
BenBrahim, M;Loustau, D;Saur, E
海松幼苗生长在温室里装满粗砂的4升盆栽中。幼苗分别饲喂三种不同磷浓度（0、0.125和0.5 mM）的营养液。生长1年后，对成熟针叶进行气体交换测量。根据这些测量，利用Farquhar等人（1980）描述的光合作用生化模型估计了CO2同化的主要参数（羧基化效率、表观量子效率和最大电子传输速率）。叶片非结构碳水化合物也进行了分析。缺磷降低了叶片磷浓度，但不影响叶片氮浓度。缺磷幼苗的最大光合速率、羧化效率和表观量子效率下降。而最大电子传递速率和气孔导度不受磷供应的影响。低磷营养在光期结束时引起叶片淀粉水平的急剧增加。综上所述，磷营养不足主要影响光合暗反应、表观量子效率和淀粉积累。
Maritime pine seedlings were grown in 4 L pots filled with coarse sand in a greenhouse. Seedlings were supplied with a nutrient solution with three different concentrations of phosphorus (0, 0.125 and 0.5 mM). After 1 year of growth, gas exchange measurements were performed on mature needles. From these measurements, the main parameters of CO2 assimilation (the carboxylation efficiency, the apparent quantum efficiency and the maximal rate of electron transport) were estimated using the biochemical model of photosynthesis as described by Farquhar et al (1980). Leaf nonstructural carbohydrates were also analyzed. Phosphorus deficiency decreased the phosphorus foliar concentration, but did not affect foliar nitrogen concentration. The maximal rate of photosynthesis, the carboxylation efficiency and the apparent quantum efficiency decreased in phosphorus deficient seedlings. However, the maximal rate of electron transport and stomatal conductance were not affected by phosphorus supply. Low phosphorus nutrition caused a dramatic increase in foliar starch level at the end of the photoperiod. These results indicate that inadequate phosphorus nutrition principally affected the dark reactions of photosynthesis, the apparent quantum efficiency and starch accumulation.