Photosynthetic and Stomatal Morphological Variation of Poplar Clones in Seedling Stage under Drought Stress

doi:10.7525/j.issn.1673-5102.2020.02.003

Abstract

Abstract: The experiment was conducted to study the changes of leaf stomatal morphological and photosynthetic characteristics of Populus spp. under different drought stress. Four poplar clones were taken as materials and investigated their photosynthetic and leaf stomatal morphological characteristics under drought stress. By ANOVA analysis, there were significant differences(P<0.01) for all traits among different source of variation in different treatment except stomatal apparatus length. With the reduction of soil relative water content, net photosynthetic rate, transpiration rate and stomatal conductance decreased, however, the intercellular CO₂ concentration increased at first and then decreased. These results suggested that that drought-induced photosynthetic inhibition was due to stomatal limitation when the relative water content of soil was above 40%; However, the main limiting factor of photosynthetic inhibition of plants under severe drought stress was due to non-stomatal limitation. Drought decreased all traits of stomatal morphological characteristics. Using the method of subordinate function analysis, the drought-tolerance of Populus psedosimonii×P.nigra ‘baicheng-1’ was better than other clones.

Key words: Poplar, drought stress, photosynthetic characteristics, leaf stomatal morphological characteristics, subordinate function analysis

CLC Number:

S792.11

QIAO Bin-Jie, WANG De-Qiu, GAO Hai-Yan, LI Zhao-Min, GE Li-Li, DING Wen-Ya, ZHAO Xi-Yang. Photosynthetic and Stomatal Morphological Variation of Poplar Clones in Seedling Stage under Drought Stress[J]. Bulletin of Botanical Research, 2020, 40(2): 177-188.

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