Comparison of leaf morphology and photosynthetic characteristics of three Hippophae rhamnoides strains
To reveal the differences in photosynthetic characteristics of three Hippophae rh-amnoides strains,and explore the effects of mature leaf morphology and other factors on their net photosynthetic rate,this study measured the leaf morphology index and photosyn-thetic physiological indicators of three H.rhamnoides strains,namely"Nordic No.1","Yulu",and"Shenqiuhong",and analyzed the influencing factors of net photosynthetic rate.The results showed that:(1)"Yulu"had the largest leaf area and"Shenqiuhong"had the smallest leaf area,but the differences in leaf morphology and various indicators among the three varieties were not significant;(2)Netphotosynthetic rate(Pn),transpiration rate(Tr),intercellular carbon dioxide concentration(Ci),and stomatal conductance(Gs)of"Nordic No.1"were significantly higher than the other two varieties,and the water use efficiency and stomatal limitation values were significantly lower than the other two varieties;(3)Multiple stepwise regression analysis showed that physiological factors transpiration rate and intercel-lular carbon dioxide concentration were the main influencing factors of netphotosynthetic rate in the three varieties.The decrease in netphotosynthetic rate in"Nordic No.1"and"Shenqiuhong"was influenced by stomatal conductance,while the decrease in netphotosyn-thetic rate in"Yulu"was caused by non stomatal limitation.In summary,"Nordic No.1"maintains a higher photosynthetic production capacity by consuming more water;"Shenqi-uhong"maintained photosynthetic production capacity through higher water use efficiency.However,there was no significant difference in photosynthetic rate and other indicators be-tween"Yulu"and"Shenqiuhong",and the photosynthetic capacity was similar,indicating that"Yulu"guaranteed its photosynthetic production capacity through a larger leaf area.
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