Anatomical physiological and biochemical processes involved in grapevine rootstock drought tolerance

Liu Minmin, Yin Yonggang, J. Nan, Han Bin, Sun Yan, Liu Changjiang, Zhao Shengjian, Guo Yong, Guo Zijuan
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Abstract

In order to explore the drought resistance mechanism of grape rootstocks, two grape rootstock species, '1103P' (a drought-tolerant rootstock) and '101-14M' (drought-sensitive), were treated with moderate water deficit (field capacity of 45-50 %). Throughout the experimental period, the leaves of '1103P' showed a higher stomatal conductance (gs), relative water content and photosynthetic rate (Pn) than '101-14M', indicating '1103P' was more resistant to tolerant than '101-14M'. We propose that '1103P' could prevent water loss from leaves under drought conditions based on the discoveries that '1103P' had higher leaf phytohormone abscisic acid (ABA) content and leaf cuticular wax content, and smaller stomata aperture than those of '101-14M'. Additionally, the activities of H2O2-scavenging enzymes in leaves of '1103P' were higher than those of '101-14M' under drought conditions, indicating the lipid peroxidation induced by H2O2 of '1103P' was less serious than that of '101-14M'. Therefore, better water-saving and higher reactive oxygen species (ROS) scavenging abilities contributed together to stronger drought resistance of '1103P' than '101-14M'.
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葡萄砧木抗旱性的解剖生理生化过程
为探讨葡萄砧木的抗旱机理,以‘1103P’(抗旱型砧木)和‘101-14M’(抗旱型砧木)两个品种为研究对象,进行了适度亏水处理(田间容量为45- 50%)。在整个试验期内,‘1103P’叶片气孔导度(gs)、相对含水量和光合速率(Pn)均高于‘101-14M’,表明‘1103P’比‘101-14M’更具抗性。我们发现‘1103P’具有较高的叶片激素ABA (abscisic acid, ABA)含量和叶片角质层蜡含量,气孔孔径比‘101-14M’小,因此我们认为‘1103P’在干旱条件下可以防止叶片水分流失。干旱条件下,‘1103P’叶片H2O2清除酶活性高于‘101-14M’,表明‘1103P’叶片H2O2诱导的脂质过氧化程度低于‘101-14M’。因此,‘1103P’比‘101-14M’具有更强的节水能力和更强的活性氧清除能力,共同促成了‘1103P’比‘101-14M’更强的抗旱性。
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