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作者	单位
康华靖，楼珏，王复标，安婷，叶子飘	(1.温州市农业科学研究院，浙江温州 325006 2.浙南作物育种重点实验室，浙江温州 325006 3.井冈山大学数理学院生物物理研究所, 江西吉安 343009)

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中文摘要:

为了定量研究水分利用效率(water use efficiency, WUE)对CO₂浓度的响应，在植物光合作用对CO₂响应模型的基础上构建了WUE(分为内禀水分利用效率和瞬时水分利用效率，即WUE_i和WUE_inst)对CO₂(包括大气CO₂浓度和胞间CO₂浓度，即C_a和C_i)的响应模型，并应用新构建的模型对小麦(Triticum aestivum L.)测量数据进行了拟合。结果表明，新构建的模型不仅可以很好地拟合小麦叶片WUE对CO₂浓度的响应曲线(包括WUE_i-C_a、WUE_i-C_i、WUE_inst-C_a和WUE_inst-C_i曲线)，而且还可以直接给出小麦的最大WUE_i和WUE_inst以及相对应的饱和C_a和C_i。以小麦WUE_i-C_a和WUE_inst-C_a曲线拟合结果为例，得到的最大WUE_i和WUE_inst分别为176.29 μmol·mol^-1和8.65 mol·mmol^-1，其对应的观测值分别为172.96 μmol·mol^-1和8.62 mol·mmol^-1；拟合得到的饱和CO₂浓度分别为1 410.52和  1 399.73  μmol·mol^-1，对应的观测值分别为1 294.05和1 332.84 μmol·mol^-1。拟合值与观测值之间均无显著差异。由此可见，新建模型拟合得到的这些参数与观测值高度相符，可用于植物WUE对未来CO₂增加响应规律研究。

英文摘要:

In order to quantitatively study the response of water use efficiency(WUE) to CO₂ concentration, a model of water use efficiency(WUE containing intrinsic water use efficiency:WUE_i, and instantaneous water use efficiency:WUE_inst) response to air and intercellular CO₂ concentration was developed based on a new model of photosynthesis response to CO₂(P_n-C_i). The gas exchange data of wheat(Triticum aestivum L.) measured by LI-6400-40 portable photosynthetic apparatus were fitted by the model. The results showed that the response curves of WUE to CO₂ concentration(including WUE_i-C_a, WUE_i-C_i, WUE_inst-C_a and WUE_inst-C_i curves) of wheat leaves can be well fitted by the new model. Moreover, the maximum WUE_i and WUE_inst and the corresponding saturated C_a and C_i of wheat can be directly and accurately obtained. Taking the curve fitting results of WUE_i-C_a and WUE_inst-C_a of wheat as an example, the maximum WUE_i and WUE_inst were 176.29 μmol·mol^-1 and 8.65 mol·mmol^-1, respectively, and the corresponding observed values were 172.96 μmol·mol^-1 and 8.62 mol·mmol^-1, respectively; the fitted saturated CO₂ concentrations were 1 410.52 and  1 399.73 μmol·mol^-1, respectively, and the corresponding observed values are 1 294.05 and  1 332.84 μmol·mol^-1, respectively. There are no significant differences between the fitted and observed values. It could be seen that these parameters obtained by fitting the new model were highly consistent with the observed values. Consequently, the developed model of WUE response to CO₂ provides an alternative mathematical tool to investigate how WUE changes with CO₂ concentration in the future.

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