Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert
The study of plant photosynthesis under different degrees of drought stress can provide a deeper understanding of the mechanism of plant drought resistance. In the Taklimakan Desert, saline groundwater is the only local water source with regard to shelterbelt construction and determines plant growth...
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MDPI AG
2022-04-01
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| author | Jiao Liu Ying Zhao Tanveer Ali Sial Haidong Liu Yongdong Wang Jianguo Zhang |
| author_facet | Jiao Liu Ying Zhao Tanveer Ali Sial Haidong Liu Yongdong Wang Jianguo Zhang |
| author_sort | Jiao Liu |
| collection | DOAJ |
| description | The study of plant photosynthesis under different degrees of drought stress can provide a deeper understanding of the mechanism of plant drought resistance. In the Taklimakan Desert, saline groundwater is the only local water source with regard to shelterbelt construction and determines plant growth and photosynthetic changes. In this study, daily dynamics of gas exchange parameters and their responses to photosynthetic photon flux density at three irrigation levels (W1 = 17.5, W2 = 25, W3 = 35 mm) were measured for two main species, i.e., <i>Calligonum mongolicum</i> (<i>C</i>) and <i>Haloxylon ammodendron</i> (<i>H</i>). <i>H</i> was better adapted to drought stress than <i>C</i>. Net photosynthetic rate (P<sub>N</sub>) was mainly related to soil water status in the main root system activity layer. In July, the daily variations of P<sub>N</sub> and transpiration (T<sub>r</sub>) for <i>C</i> were higher than <i>H.</i> <i>C</i> increased water use efficiency (WUE) with increases in P<sub>N</sub>, while <i>H</i> decreased T<sub>r</sub> to obtain a higher WUE. Either <i>C</i> or <i>H</i>, drought reduced the low light and metabolic capacity, and thus decreased the light adaptability and photosynthesis potential. We suggest a prerequisite understanding of physiological mechanisms and possible plant morphological adjustments required to adapt plant species to desert drought conditions. |
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| last_indexed | 2024-03-10T03:33:31Z |
| publishDate | 2022-04-01 |
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| series | Water |
| spelling | doaj.art-b7048b8c83fc4cc1a0c2cc5a285914332023-11-23T09:34:59ZengMDPI AGWater2073-44412022-04-01149138510.3390/w14091385Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan DesertJiao Liu0Ying Zhao1Tanveer Ali Sial2Haidong Liu3Yongdong Wang4Jianguo Zhang5Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Xianyang 712100, ChinaKey Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Xianyang 712100, ChinaKey Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Xianyang 712100, ChinaXinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, ChinaXinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, ChinaKey Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Xianyang 712100, ChinaThe study of plant photosynthesis under different degrees of drought stress can provide a deeper understanding of the mechanism of plant drought resistance. In the Taklimakan Desert, saline groundwater is the only local water source with regard to shelterbelt construction and determines plant growth and photosynthetic changes. In this study, daily dynamics of gas exchange parameters and their responses to photosynthetic photon flux density at three irrigation levels (W1 = 17.5, W2 = 25, W3 = 35 mm) were measured for two main species, i.e., <i>Calligonum mongolicum</i> (<i>C</i>) and <i>Haloxylon ammodendron</i> (<i>H</i>). <i>H</i> was better adapted to drought stress than <i>C</i>. Net photosynthetic rate (P<sub>N</sub>) was mainly related to soil water status in the main root system activity layer. In July, the daily variations of P<sub>N</sub> and transpiration (T<sub>r</sub>) for <i>C</i> were higher than <i>H.</i> <i>C</i> increased water use efficiency (WUE) with increases in P<sub>N</sub>, while <i>H</i> decreased T<sub>r</sub> to obtain a higher WUE. Either <i>C</i> or <i>H</i>, drought reduced the low light and metabolic capacity, and thus decreased the light adaptability and photosynthesis potential. We suggest a prerequisite understanding of physiological mechanisms and possible plant morphological adjustments required to adapt plant species to desert drought conditions.https://www.mdpi.com/2073-4441/14/9/1385desert plantphotosynthesisdrought stressdrip irrigation |
| spellingShingle | Jiao Liu Ying Zhao Tanveer Ali Sial Haidong Liu Yongdong Wang Jianguo Zhang Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert Water desert plant photosynthesis drought stress drip irrigation |
| title | Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert |
| title_full | Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert |
| title_fullStr | Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert |
| title_full_unstemmed | Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert |
| title_short | Photosynthetic Responses of Two Woody Halophyte Species to Saline Groundwater Irrigation in the Taklimakan Desert |
| title_sort | photosynthetic responses of two woody halophyte species to saline groundwater irrigation in the taklimakan desert |
| topic | desert plant photosynthesis drought stress drip irrigation |
| url | https://www.mdpi.com/2073-4441/14/9/1385 |
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