PJB-2017-181
VARIATION IN LEAF PHOTOSYNTHETIC CHARACTERISTICS IN A NEW BUD MUTANT OF POPULUS
Junqiang. Li, Lihua. Lin, Fan. Zhang, Xueqin Wan, Jinglong Zhao, Jifei Dong, Lingxia Sun and Qibing Chen
Abstract
Variations in leaf pigment contents, gas-exchange characteristics, and other important leaf traits were investigated in the mutant ‘Quanhong poplar’ (QHP) and the wild type Populus Linn 2025 (L 2025) poplar. The significant differences were observed in photosynthetic pigment contents and photosynthetic efficiency between the mutant type and the wild type. The mean chlorophyll (Chl), carotenoid (Car) and anthocyanin (Ant) contents in the leaves of QHP were higher than that of L2025. Remarkable differences were observed in the rate of photosynthesis (PN), stomatal conductance (gs), transpiration rate (R), and intercellular CO2 concentration (Ci). The mean PN, R, gs and Ci in QHP were significantly lower than that in L2025. Transcriptome sequencing revealed that the reduced photosynthetic rate was probably due to the inhibition of the photosynthetic electron transport rather than the changes of photosynthetic pigment contents, because the plant photosynthetic capacity is closely associated with both the photosynthetic pigment content, especially Chl and photosynthetic electron transport rate.
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