Relationships of growth, stable carbon isotope composition and anatomical properties of leaf and xylem in seven mulberry cultivars: a hint towards drought tolerance

文献类型： 外文期刊

第一作者： Cao, X.

作者： Cao, X.;Shen, Q.;Liu, L.;Cheng, J.;Cao, X.;Shen, Q.;Liu, L.;Cheng, J.

作者机构：

关键词： delta C-13; delta N-15; leaf and xylem anatomy; model average method; Morus

期刊名称：PLANT BIOLOGY （ 影响因子：3.081； 五年影响因子：2.972 ）

ISSN： 1435-8603

年卷期： 2020 年 22 卷 2 期

页码：

收录情况： SCI

摘要： The fast growth of mulberry depends on high water consumption, but considerable variations in drought tolerance exist across different cultivars. Physiological and anatomical mechanisms are important to plant survival under drought. However, few research efforts have been made to reveal the relationships of these two aspects in relation to drought tolerance. In this study, growth rates, leaf functional physiology and anatomical characteristics of leaf and xylem of 1-year-old saplings of seven mulberry cultivars at a common garden were compared. Their relationships were also explored. Growth, leaf physiology and anatomy were significantly different among the tested cultivars. Foliar stable carbon isotope composition (delta C-13) was negatively correlated with growth rates, and closely related to several leaf and xylem anatomical traits. Particularly, leaf thickness, predicted hydraulic conductivity and vessel element length jointly contributed 77% of the variability in delta C-13. Cultivar Wupu had small stomata, intermediate leaf thickness, the smallest hydraulically weighted vessel diameter and highest vessel number, and higher delta C-13; Yunguo1 had high abaxial stomatal density, low specific leaf area, moderate hydraulic conductivity and delta C-13; these are beneficial features to reduce leaf water loss and drought-induced xylem embolism in arid areas. Cultivar Liaolu11 had contrasting physiological and anatomical traits compared with the previous two cultivars, suggesting that it might be sensitive to drought. Our findings indicate that growth and delta C-13 are closely associated with both leaf and xylem anatomical characteristics in mulberry, which provides fundamental information to assist evaluation of drought tolerance in mulberry cultivars and in other woody trees.

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