本文選題：柑橘幼苗　切入點(diǎn)：干旱脅迫　出處：《浙江農(nóng)業(yè)學(xué)報(bào)》2017年09期 　論文類型：期刊論文

【摘要】：采用盆栽控水的方法,比較干旱脅迫對(duì)2種抗旱性不同的柑橘——三湖紅橘和三湖化紅生長(zhǎng)形態(tài)、滲透調(diào)節(jié)物質(zhì)含量和抗氧化酶活性的影響。結(jié)果表明:干旱脅迫可以降低2種柑橘的株高,增加根冠比,同時(shí)降低三湖化紅主根長(zhǎng),增加三湖紅橘主根長(zhǎng);此外,干旱脅迫導(dǎo)致2種柑橘幼苗葉片和根系的脯氨酸含量顯著增加,三湖紅橘葉片脯氨酸含量增幅更大;除三湖紅橘葉片的可溶性糖含量降低外,干旱脅迫后2種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,干旱脅迫后2種柑橘葉片中SOD和CAT活性均下降,而根中2種酶活性均上升;三湖紅橘葉片POD活性先升高后降低,根中POD活性顯著升高;三湖化紅葉片POD活性一直顯著高于對(duì)照,根中POD活性則顯著降低。綜上,三湖紅橘的抗旱性強(qiáng)于三湖化紅可能與其在干旱脅迫條件下主根長(zhǎng)度增加,根冠比增大從而提高根系水分吸收能力有關(guān)。此外,干旱脅迫后滲透物質(zhì)尤其是葉片脯氨酸的積累和POD活性的升高,也有助于其應(yīng)對(duì)干旱脅迫帶來(lái)的傷害。
[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.
【作者單位】： 江西農(nóng)業(yè)大學(xué)農(nóng)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31460496) 江西省青年科學(xué)基金項(xiàng)目(20161BAB214175)
【分類號(hào)】：S423;S666
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本文編號(hào)：1604223