Seasonal Photosynthetic and Water Relation Responses of Three Cool Temperate Garden Shrubs to Drought Stress

文献类型： 外文期刊

第一作者： Li, Jiaying

作者： Li, Jiaying;Lu, Shaowei;Li, Shaoning;Li, Bin;Hou, Liwei;Zhao, Na;Xu, Xiaotian;Li, Jiaying;Lu, Shaowei;Li, Shaoning;Li, Bin;Hou, Liwei;Zhao, Na;Xu, Xiaotian;Li, Jiaying;Lu, Shaowei;Li, Shaoning;Hou, Liwei

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关键词： urban greenery; drought stress; seasonal characteristics; leaf water potential; photosynthetic rate; stomatal conductance

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 8 期

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收录情况： SCI

摘要： The globally increasing frequency of extreme drought events exacerbates the contradiction between the supply of water and the demand for high-quality urban greening. However, the mechanism of the response of urban shrubs to drought stress remains unclear. In this study, three typical urban shrubs (Euonymus japonicus, golden vicary [Ligustrum x vicaryi], and Japanese purple barberry [Berberis thunbergii var. atropurpurea]) that are used for greening in northern China were exposed to three levels of water (full irrigation, natural rain-fed, and extreme drought) in different periods of the growing season (April to May, June to July, and August to September) to investigate the responses of leaf water potential and photosynthetic parameters. The main results were as follows: (1) all the leaf water potentials (Psi) and photosynthetic parameters (P-n) showed a typical linear relationship along the water gradient in the middle of the growing season. Extreme drought decreased the photosynthetic rates by 1.26 similar to 11.03 mu mol center dot m(-2)center dot s(-1) compared with the irrigated groups. However, the responses were less pronounced in the early and late growing seasons. (2) Different shrubs responded with different intensities and mechanisms. B. thunbergii var. atropurpurea showed clear anisohydric behavior throughout the whole growing season, while L. x vicaryi and E. japonicus showed stronger isohydric behavior during the early and late growing seasons. These findings are important to improve the sustainability of maintenance of ornamental plants from the scope of the efficient utilization of urban water resources.

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