Response of Photosynthesis and Leaf Morphological Characteristics to Drought Stress in Glycyrrhiza uralensis

doi:10.7525/j.issn.1673-5102.2021.03.016

Abstract

Abstract:

The changes of photosynthesis， stomatal changes and glandular morphologic of leaves in Glycyrrhiza uralensis were measured with pot-culture drought stress in greenhouse， and the drought resistance of them were evaluated by membership function and drought resistance coefficient. The response of leaf photosynthesis， stomatal micromorphology and glandular morphology to drought stress was studied by pot controlled water natural drought method. The results showed that leaf net photosynthetic rate（P_n）， stomatal conductance（G_s） and transpiration rate（T_r） have been rising since the degree of drought resistance after the trend of lower， and the intercellular CO₂（C_i） concentration increased rapidly in the severe drought stress. Moreover， leaf total stomata density and stomata opening than with the intensification of the degree of drought stress， the trend of first increases and then decreases， and stomatal opening width is gradually decreasing trend. Importantly， since the degree of drought stress， leaf epidermis and lower epidermis gland density overall showed a trend of increase in the total number of gland color as the degree of drought stress increased gradually deepened， shape appears irregular fold and retraction. The glandular characteristics on the leaf surface of G. uralensis are involved in the regulation of drought resistance， so as to avoid the damage of drought stress to G.uralensis. Under severe drought stress， stress accelerated the programmed death of stomatal cells（PCD）， and G.uralensis seedlings lost their ability to resist drought.

Key words: Glycyrrhiza uralensis, drought stress, photosynthesis, stomatal, glands

CLC Number:

S567.7

Dong ZHANG, Yan LIU, Han ZHANG, Zi-Jian ZHANG, Yang WANG, Mei-Cen LIU. Response of Photosynthesis and Leaf Morphological Characteristics to Drought Stress in Glycyrrhiza uralensis[J]. Bulletin of Botanical Research, 2021, 41(3): 449-457.

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