选取采自同一银杏植株上黄叶及绿叶银杏的2年生嫁接苗,通过测定不同温度下黄叶及绿叶银杏光响应曲线,采用4种常用模型(直角双曲线模型、非直角双曲线模型、指数模型和改良直角双曲线模型)分别拟合响应曲线并计算相关参数。结果表明,改良直角双曲线模型为银杏光响应曲线拟合的最优模型。同时,比较不同温度下嫁接苗光合参数(改良直角双曲线模型)发现:在相同温度下,黄叶银杏的光饱和点及最大净光合速率(Pn,max)显著低于绿叶银杏; 当温度升高至阈值时,表观量子效率(Φ)、暗呼吸速率(RD)和光补偿点显著下降,黄叶银杏温度阈值(4月时为≥28 ℃,7月时为≥38 ℃)明显低于绿叶银杏(4月时为≥30 ℃,7月时为≥40 ℃)。
Abstract
In this paper, we measured the light response curves of two ginkgo variants under different temperature, which were two-year old grafted ginkgo plants including the yellow and green genotypes collected from the two branches of the same tree, and then fitted those curves by four common models(the rectangular hyperbola model, the nonrectangular hyperbola model, the exponential model and the modified rectangular hyperbola model). It revealed that rectangular hyperbolic model was the best model to fit ginkgo’s light response curve. Meanwhile, we compared photosynthetic parameters of those two grafted ginkgos under different temperature. It was revealed that the values of light saturation point and maximum net photosynthetic rate(Pn,max)in yellow-leaf grafted ginkgo were significantly lower than yellow-leaf grafted ginkgo under same temperature, while apparent quantum yield(Φ), dark respiration rate(RD)and light compensation point dropped significantly when temperature was above threshold value and threshold values of yellow ginkgo(≥28 ℃ in April and ≥38 ℃ in July)were lower than green ginkgo(≥30 ℃ in April and ≥40 ℃ in July). Based on the results, we provided a reference for the future study on ginkgo’s light response curve under difference stresses. Meanwhile, the upper temperature of these two kinds of ginkgo was a theoretical basis for establishing cultivation and management measure of yellow-leaf grafted ginkgo.
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基金
收稿日期:2014-10-24 修回日期:2015-01-04
基金项目:国家自然科学基金项目(31170627); 江苏省自然科学基金项目(BK2010019); 江苏省普通高校研究生科研创新计划项目(CXZZ12_0546); 南京林业大学优秀博士学位论文创新基金项目
第一作者:王欢利,博士生。*通信作者:曹福亮,教授。 E-mail: samcaoster@gmail.com。
引文格式:王欢利,曹福亮,刘新亮. 高温胁迫下不同叶色银杏嫁接苗光响应曲线的拟合[J]. 南京林业大学学报:自然科学版,2015,39(2):14-20.
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