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

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Relationships of growth, stable carbon isotope composition and anatomical properties of leaf and xylem in seven mulberry cultivars: a hint towards drought tolerance.
Plant Biology ( IF 4.2 ) Pub Date : 2019-12-06 , DOI: 10.1111/plb.13067
X Cao _{1,

2} , Q Shen _{1,

2} , L Liu _{1,

2} , J Cheng _{1,

2}

Affiliation

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 (δ13 C) 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 δ13 C. Cultivar Wupu had small stomata, intermediate leaf thickness, the smallest hydraulically weighted vessel diameter and highest vessel number, and higher δ13 C; Yunguo1 had high abaxial stomatal density, low specific leaf area, moderate hydraulic conductivity and δ13 C; 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 δ13 C 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.

中文翻译：

七个桑树品种的生长，稳定的碳同位素组成以及叶片和木质部的解剖学特性之间的关系：提示耐旱性。

桑树的快速生长取决于高耗水量，但不同品种的耐旱性差异很大。生理和解剖学机制对于干旱条件下的植物生存至关重要。但是，很少有研究工作来揭示这两个方面与耐旱性的关系。在这项研究中，比较了在一个公共花园中七个桑树品种的1岁树苗的生长速率，叶片功能生理以及叶片和木质部的解剖特征。他们的关系也进行了探讨。被测品种之间的生长，叶片生理和解剖结构显着不同。叶面稳定碳同位素组成（δ13C）与生长速率呈负相关，并与几种叶片和木质部的解剖特征密切相关。特别，叶片厚度，预测的水力传导率和容器元件长度共同贡献了δ13C的77％变异性。Yunguo1背面气孔密度高，比叶面积小，水力传导率中等，δ13C。这些都是减少干旱地区叶片水分流失和干旱引起的木质部栓塞的有益特征。与前两个品种相比，辽鲁11号的生理和解剖学特征相反，表明它可能对干旱敏感。我们的发现表明，桑树的生长和δ13C与叶片和木质部的解剖特征密切相关，

更新日期：2019-12-06

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