镉对不同品种水稻光合作用的影响

doi:10.3969/j.issn.1000-6362.2016.05.006

摘要/Abstract

摘要：

采用盆栽土培法，以对镉相对敏感的水稻品种YZX和相对耐受的品种XY-12为材料，通过对人工添加镉后（土壤中镉浓度达到5mg·kg^-1）水稻齐穂期叶片光合速率的测定，选用直角双曲线模型、非直角双曲线模型和叶子飘新模型对光响应曲线进行拟合，探究镉对不同品种水稻叶片光响应特征的影响，并对不同光响应模型进行比较。结果表明，镉处理后，两个水稻品种净光合速率均表现为降低；镉对两水稻品种光响应曲线参数的影响存在差异，内禀量子效率、最大净光合速率、光饱和点均受到镉的影响，较不添加镉的对照降低，而镉处理后水稻剑叶光补偿点却大大增加；镉促进了品种YZX的暗呼吸作用，但对品种XY-12却表现为抑制作用；总体上，品种XY-12对土壤中镉的耐受性强于YZX；3种模型模拟的光响应曲线均能较好地反映两品种叶片光合作用的光响应特征，但光响应参数与实测值存在差异，直角双曲线模型和非直角双曲线模型拟合的最大净光合速率（P_max）远大于实测值，并且光补偿点（LCP）和暗呼吸速率（Rd）与实测值相比存在较大差异，而采用传统的线性回归方法得到的光饱和点（LSP）却远低于实测值，叶子飘模型拟合的各项参数与实测值最为接近，并很好地弥补了其它模型的缺点。因此，该模型在反映水稻在镉毒害下叶片光合作用的光响应特征等方面具有较大优势。

关键词: 水稻, 镉, 光响应曲线, 光响应特征参数, 模型

Abstract:

Taking relative sensitive variety YZX and relative tolerant variety XY-12 as materials, photosynthetic rate of rice, which were pot cultured in the soil treated with cademium, was measured during full heading stage. The results fitted by the non-rectangular hyperbola model, the rectangular hyperbola model and the YE Zi-piao new model were used to reveal the impact of cademium on the different rice leaf photosynthesis light response characteristics and compared. The results showed that under cadmium treatment, the net photosynthetic rate of two rice varieties decreased. There were differences in the effects of Cd on light response characteristic parameters of two rice varieties, the intrinsic quantum yield, maximum photosynthetic rate, and saturation light points were affected by cadmium lower than the control, and the light compensation point was greatly increased. Cadmium promoted the dark respiration of YZX variety but XY-12 variety demonstrated inhibition. Generally, YZX variety was more sensitive to cadmium than XY-12 variety. All the three models performed well in reflecting the light response characteristic of photosynthesis, but there were differences between the results of three models of light response characteristic and measured values. The maximum net photosynthetic rate (P_max) for non-rectangular hyperbola model and rectangular hyperbola model calculated much higher parameter values than the measured ones, and the dark respiration rate (Rd) and light compensation point (LCP) much lower than the measured value. The light saturation point (LSP), determined by the traditional liner regression method, was far lower than the measured value. The light response characteristic parameters for the YE Zi-piao new model was the most close to the measured value. And it was good to make up for the shortcomings of other models. Therefore, the YE Zi-piao new model had greater advantages in reflecting light response characteristics of photosynthesis in leaves of rice under cadmium treatment.

Key words: Rice, Cadmium, Light response curve, Light response characteristic parameters, Model

滕振宁，方宝华，刘洋，何洋，杨坚，何小娥，张玉烛. 镉对不同品种水稻光合作用的影响[J]. 中国农业气象, 2016, 37(05): 538-544.

TENG Zhen-ning, FANG Bao-hua, LIU Yang, HE Yang, YANG Jian, HE Xiao-e, ZHANG Yu-zhu. Effects of Cd on Photosynthesis of Different Rice Varieties[J]. Chinese Journal of Agrometeorology, 2016, 37(05): 538-544.

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