Effects of pigment and photosynthetic characteristics of Populus deltoides grafted seedlings under waterlogging stress
Three varieties of grafting seedlings were used as experimental materials,the response changes of photosynthetic characteristics and the effects on leaf pigment mass fraction of three poplar varieties under different stress treatment times were studied by using randomized block design and potted plant simulating arid environment,and the normal soil moisture content was used as the control,as well as the correlation among various indicators.The results showed that the pigment quality fraction,Gs,Pn,Tr,and Ciof 3 poplar cultivars all decreased significantly during the waterlogging stress period.At the later stage of stress,the decrease rate of chlorophyll a was greater than that of chlorophyll b.Meanwhile,Ci in leaves increased and CE decreased.The correlation between C and Pn changed from positive to negative,the decrease of Pn was mainly caused by non-stomatal limitation.The correlation analysis of Pn showed different results.The anthocyanin content was positively correlated with Pn in the leaves of P.deltoides cv.'Quanhong',while the anthocyanin content of'Poplar 2025'was negatively correlated with Pn.Under waterlogging stress of 70 d,Pn of leaves of the three poplar varieties was always positive,and WUE increased significantly,showing stable waterlogging resistance genetic characteristics.Among them,the waterlogging resistance ability of P.deltoides cv.'Quanhong'was relatively weak.
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