| Effect of regulating soil matric potential under drip irrigation on physiological characteristics and secondary metabolite contents of Taxus chinensis |
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| DOI：10.7606/j.issn.1000-7601.2021.05.17 |
| Key Words: soil matric potential Taxus chinensis photosynthesis osmotic adjustment flavonoids polysaccharide |
| Author Name | Affiliation | | ZHANG Yuhao | School of Life Science and Technology,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | YAO Sumei | School of Life Science and Technology,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | MENG Li | School of Life Science and Technology,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | DENG Zhe | School of Life Science and Technology,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | HUANG Ling | School of Life Science and Technology,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China |
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| Abstract: |
| In order to find out the effect of different soil matric potential on physiological characteristics and secondary metabolite contents of Taxus chinensis,experiments were carried out in 2019 and 2020 growth seasons. In this experiment,the Taihang Taxus chinensis grown in pots was used as model plant and the matric potential at the depth of 20 cm underneath the drip emitter was set as five lower limits of -10 kPa(W1), -20 kPa(W2), -30 kPa(W3), -40 kPa(W4) and -50 kPa(W5), respectively, by adjusting the dripping rate. The effect of different soil matrix potential on physiological characteristics and secondary metabolite contents of leaves during experiment were analyzed.The results showed that: （1) W2 significantly improved the photosynthetic capacity of Taxus chinensis. Compared with W5, the net photosynthetic rate of W2 leaves increased by 98.18% and 106.62% in 2019 and 2020, respectively.W2 also significantly increased the AQE and Rd of Taxus chinensis leaves. Compared with W5, the AQE of W2 leaves increased by 80.76% and 26.32% in 2019 and 2020, respectively, and the Rd increased by 34.39% and 42.12%, respectively.Meanwhile, the Lsp and the Pnmax of Taxus chinensis leaves reached the maximum valuein the W2 treatment in both years. The Lsp and Pnmax of leaves in W2 were 961.59 μmol·m-2·s-1 and 3.656 μmol·m-2·s-1 in 2019,and they were 865.25 μmol·m-2·s-1 and 3.850 μmol·m-2·s-1 in 2020, respectively. The chlorophyll a and total chlorophyll content of leaves in W2 were the highest, which were 2.59 mg·g-1 and 3.42 mg·g-1, respectively. Therefore, W2 was beneficial to enhance the photosynthetic capacity of Taxus chinensis. （2) There was no significant difference in the MDA content of Taxus chinensis leaves in the early stage of the experiment, and the soluble protein content reached the maximum value in the W3 treatment, which increased 10.36% and 14.56% compared with W1 and W5, respectively. The MDA content of W4 and W5 leaves was significantly higher than that of other treatments at the later stage of the experiment, and reached the maximum value in W5, which increased by 30.34%, 40.88%, 34.32% and 5.37%， respectively， compared with W1, W2, W3 and W4. The soluble protein content reached the maximum value in W2, which increased 14.35%,11.39%,28.53% and 47.31% compared with W1、W3、W4 and W5, respectively. Taxus chinensis has certain resistance to short\|term water deficit, and in long\|term water deficit, the cell membrane\|lipid peroxidation of Taxus chinensis leaves is intensified. (3) The contents of flavonoids and polysaccharides in the leaves of Taxus chinensis were significantly regulated by soil matrix potential. The flavonoids content in the leaves of Taxus chinensis reached the maximum in W3 in 2019 and 2020, and the polysaccharides content reached the maximum in W2.Therefore,keeping the soil matrix potential at the depth of 20 cm below the emitter at -20 kPa appeared to be optimal to improve the physiological activity and photosynthetic ability of Taxus chinensis and promote the accumulation of polysaccharides in leaves,and keeping the soil matrix potential at -30 kPa appeared to be optimal to promote the accumulation of flavonoids in Taxus chinensis leaves. |
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