Comparative Analysis of Photosynthetic Physiology and Chlorophyll Fluorescence Characteristics of Different Varieties of Carya illinoensis
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摘要: 以浙西南地区7个薄壳山核桃品种‘Schley’‘Barton’‘Excell’‘Eliott’‘Disirable’‘Mohawk’‘Caddo’为试材，采用乙醇浸提-分光光度法、LI-6400XT OPEN6.2便携式光合测定系统、PAM-2100便携式调制叶绿素荧光仪，测定了不同品种薄壳山核桃苗生长指标、色素含量、光合生理和叶绿素荧光特性，以期为薄壳山核桃良种选育和应用推广提供参考依据。结果表明：7个薄壳山核桃品种间生长指标和叶片色素含量差异显著，其中‘Excell’‘Eliott’的苗高、地径、新梢长度均显著大于其他品种，‘Excell’的Chl a、Chl b、Chl和Car含量显著高于其他品种，‘Caddo’的各色素含量均最低。在光合生理和叶绿素荧光特性上，‘Excell’‘Eliott’的Amax和ΦPSⅡ显著高于其他品种。基于主成分分析法建立不同品种薄壳山核桃苗光合荧光特性综合评价模型，对这7个品种薄壳山核桃苗光合荧光特性进行综合评价，其综合评价得分为‘Excell’>‘Eliott’>‘Barton’>‘Disirable’>‘Caddo’>‘Schley’>‘Mohawk’,即‘Excell’的光合能力最强，生长适应性也相对更好。Abstract: Seven thin shell walnut varieties ‘Schley’ ‘Barton’ ‘Excell’ ‘Eliott’ ‘Disiraable’ ‘Mohawk’ and ‘Caddo’ in the southwestern region of Zhejiang Province were used as test materials, with their growth indicators, pigment content, photosynthetic physiology, and chlorophyll fluorescence characteristics, through methods as ethanol extraction-spectrophotometric method, LI-6400XT OPEN 6.2 portable photosynthesis measurement system, PAM-2100 portable modulation chlorophyll fluorescence spectrometer and so on, in order to provide reference for the breeding and application promotion of thin shell walnut varieties.The results showed that there were significant differences in growth indicators and leaf pigment content among the seven thin shell walnut varieties, such as the seedling height, ground diameter, and new shoot length of ‘Excell’ and ‘Eliott’ were significantly higher than those of other varieties, the Chl a, Chl b, Chl, and Car contents of ‘Excell’ were significantly higher than those of other varieties, and each pigment contents of ‘Caddo’ were the lowest.The results of photosynthetic physiology and chlorophyll fluorescence parameters showed that the Amax and ΦPSⅡ of ‘Excell’ and ‘Eliott’ were significantly higher than other varieties.Founded on principal component analysis, a comprehensive evaluation model for photosynthetic fluorescence characteristics of different varieties of thin shell walnut seedlings was established and used to make a comprehensive evaluation of the seven thin shell walnut varieties and the score were ‘Excel’＞‘Eliott’＞‘Barton’＞‘Disirable’＞‘Caddo’＞‘Schley’＞‘Mohawk’,which showed that ‘Excel’ had better photosynthetic characteristics and better growth adaptability.
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