干旱胁迫对2种柑橘幼苗生长形态、渗透调节物质含量和抗氧化酶活性的影响
发布时间:2018-03-13 01:27
本文选题:柑橘幼苗 切入点:干旱胁迫 出处:《浙江农业学报》2017年09期 论文类型:期刊论文
【摘要】:采用盆栽控水的方法,比较干旱胁迫对2种抗旱性不同的柑橘——三湖红橘和三湖化红生长形态、渗透调节物质含量和抗氧化酶活性的影响。结果表明:干旱胁迫可以降低2种柑橘的株高,增加根冠比,同时降低三湖化红主根长,增加三湖红橘主根长;此外,干旱胁迫导致2种柑橘幼苗叶片和根系的脯氨酸含量显著增加,三湖红橘叶片脯氨酸含量增幅更大;除三湖红橘叶片的可溶性糖含量降低外,干旱胁迫后2种柑橘的可溶性糖和可溶性蛋白含量均升高。酶活性分析表明,干旱胁迫后2种柑橘叶片中SOD和CAT活性均下降,而根中2种酶活性均上升;三湖红橘叶片POD活性先升高后降低,根中POD活性显著升高;三湖化红叶片POD活性一直显著高于对照,根中POD活性则显著降低。综上,三湖红橘的抗旱性强于三湖化红可能与其在干旱胁迫条件下主根长度增加,根冠比增大从而提高根系水分吸收能力有关。此外,干旱胁迫后渗透物质尤其是叶片脯氨酸的积累和POD活性的升高,也有助于其应对干旱胁迫带来的伤害。
[Abstract]:Pot water control method was used to compare the growth patterns of two kinds of citrus with different drought resistance, that is, Sanhu red orange and Sanhu red, under drought stress. The results showed that drought stress could decrease the plant height, increase the ratio of root to shoot, decrease the length of main root and increase the length of main root of Tri-lake red orange. The content of proline in leaves and roots of two citrus seedlings increased significantly under drought stress, and the content of proline in leaves of Sanhu red orange increased even more, except for the decrease of soluble sugar content in leaves of three lakes red orange. After drought stress, the content of soluble sugar and soluble protein increased. The results of enzyme activity analysis showed that the activities of SOD and CAT in leaves of two citrus cultivars decreased after drought stress, while the activities of two enzymes in roots increased. The activity of POD increased first and then decreased, and the activity of POD in root increased significantly, and the activity of POD in red leaf of Tri-lake was significantly higher than that of control, but the activity of POD in root decreased significantly. The drought resistance of tangerine is stronger than that of Huayu, which may be related to the increase of root length and the ratio of root to shoot to increase the water absorption ability of root under drought stress. The accumulation of osmotic substances, especially the accumulation of proline and the increase of POD activity in leaves after drought stress were also helpful to deal with the damage caused by drought stress.
【作者单位】: 江西农业大学农学院;
【基金】:国家自然科学基金项目(31460496) 江西省青年科学基金项目(20161BAB214175)
【分类号】:S423;S666
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本文编号:1604223
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