Physiological response and shading tolerance evaluation of Sauropus androgynus in different planting environment

doi:10.14088/j.cnki.issn0439-8114.2024.10.018

Abstract

Abstract: In order to explore the effects of different planting environments on the physiological characteristics of Sauropus androgynus （L.） Merr. , and to evaluate its shade tolerance, the 3-year-old cutting seedlings of Sauropus androgynus were planted in three environments： Outdoor （100% light intensity）, underwood （65% light intensity） and greenhouse （30% light intensity） planting. The photosynthetic pigment content, instantaneous photosynthetic characteristics and osmotic adjustment substance content of Sauropus androgynus leaves under different environments were determined. The results showed that the contents of chlorophyll a and chlorophyll （a+b） of Sauropus androgynus in underwood and greenhouse planting were significantly higher than those of outdoor planting; with the increase of shading degree, the net photosynthetic rate of leaves increased first and then decreased, and reached the highest in underwood planting, while stomata conductance, intercellular CO₂ concentration and transpiration rate showed outdoor planting > underwood planting > greenhouse planting, and gradually decreased with the increase of shading degree. The content of soluble sugar and soluble protein increased first and then decreased with the increase of shading degree, and reached the maximum in underwood planting; the contents of free proline and MDA decreased with the increase of shading degree, and reached the maximum in outdoor planting. The results of membership degree analysis showed that the photosynthetic and physiological status of Sauropus androgynus plants was the best in underwood planting, and the too strong or too weak light environment was not suitable for their growth.

Key words: Sauropus androgynus （L.） Merr., planting environment, shade-tolerance, physiological response

CLC Number:

S649

LIANG Xiao-chun, JIANG Xing-yu, GUO Pin-xiang, YANG Xiu-ling, LI Lin, JIANG Ruo-lin, WANG Ling-hui. Physiological response and shading tolerance evaluation of Sauropus androgynus in different planting environment[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(10): 102-105.

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