LEAF PHOTOSYNTHESIS AND CONDUCTANCE OF SELECTED TRITICUM SPECIES AT DIFFERENT WATER POTENTIALS
LEAF PHOTOSYNTHESIS AND CONDUCTANCE OF SELECTED TRITICUM SPECIES AT DIFFERENT WATER POTENTIALS
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DOI：
10.1104/pp.83.4.1014
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发表时间：
1987-04-01
期刊：
影响因子：
7.4
通讯作者：
HEITHOLT, JJ
中科院分区：
文献类型：
--
作者：
JOHNSON, RC;MORNHINWEG, DW;HEITHOLT, JJ
荒漠一年生小麦叶片气体交换特征[j]。] Bowden)和小麦品种TAM W-101 （Triticum aestivum L. em Thell）叶片水势在-0.50 ~ -2.9兆帕斯卡范围内进行了比较。当环境[CO2]为330微升/升时，T. kotschyi在给定水势下的电导和CO2同化(A)高于T. aestivum。在水分充足的条件下，两种植物的A对内部CO2浓度（Ci）的响应曲线在形状和大小上相似，在环境CO2为330微升/升时，柽柳的A较高，主要与柽柳的气孔导度较高有关。在水分充足的条件下，黄颡鱼的电导率高于黄颡鱼，其Ci值较高，水分利用效率较低。然而，在水分不足的情况下，每升环境[CO2] 330微升的Ci在物种之间没有显著差异。在水分亏缺条件下，T. kotschyi的A值高于T. aestium，这主要是因为在Ci值高于150微升/升时，T. kotschyi的A - Ci响应曲线较高。结果表明，在水分充足的条件下，电导对黄颡鱼的高A起重要作用，但在水分不足的条件下，黄颡鱼的高A更多地与维持较高的叶肉光合能力有关。
Leaf gas exchange characteristics of a desert annual (Triticum kotschyi [Boiss.] Bowden) and the wheat cultivar TAM W-101 (Triticum aestivum L. em Thell) were compared over a range of leaf water potentials from -0.50 to -2.9 megapascals. At an ambient [CO2] of 330 microliters per liter, T. kotschyi had higher conductance and CO2 assimilation (A) at a given water potential than T. aestivum. Under well watered conditions, A versus internal CO2 concentration (Ci) response curves for both species were similar in shape and magnitude, and the higher A of T. kotschyi at an ambient [CO2] of 330 microliters per liter was mostly related to the higher stomatal conductance of T. kotschyi. The higher conductance of T. kotschyi than T. aestivum under well watered conditions was associated with higher Ci and lower water use efficiency. Under water deficits, however, Ci at 330 microliters per liter ambient [CO2] did not differ significantly between species. T. kotschyi had higher A under water deficits than T. aestivum primarily because its A versus Ci response curves had higher A at Ci values above about 150 microliters per liter. The results show that conductance played an important role in the high A of T. kotschyi under well watered conditions, but under water deficits the high A of T. kotschyi was related more to the maintenance of a higher capacity for mesophyll photosynthesis.