| Changes in growth and photosynthetic and other physiological characteristics of two pomegranate cultivars under drought condition |
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| DOI：10.7606/j.issn.1000-7601.2018.06.12 |
| Key Words: pomegranate natural drought growth characteristics photosynthetic characteristics soil relative moisture content |
| Author Name | Affiliation | | ZORAM Tax | Institute of Sand Control and Desertification Control, Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830063, China | | MUHTAR Zari | Institute of Economic Forest, Xinjiang Academy of Forestry Sciences, Urumqi, Xinjinag 830063, China | | LU Ming-yan | Institute of Landscape Planning Project Design, Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830063, China | | PARIDAM Abux | Forestry Management Station of Kumul City, Kumul, Xinjiang 839000, China | | WU Zheng-bao | Institute of Economic Forest, Xinjiang Academy of Forestry Sciences, Urumqi, Xinjinag 830063, China |
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| Abstract: |
| Using pomegranate cultivars, Zhongnonghong and Tunisia, as the research objects planted in the artificially controlled water environment, we studied the changes in growth parameters, photosynthetic parameters, membrane lipid peroxidation, protective enzyme activities, and content of osmotic adjustment substance in the two cultivars under drought condition. The results showed that, with the natural decline of relative water content of soil, the dry matter accumulation rate, relative conductivity, leaf MDA content and proline content of two pomegranate cultivars demonstrated a rising trend but the photosynthetic rate (Pn) decreased. The transpiration rate (Tr), stomatal conductance (Gs), catalase (CAT) activity, and soluble sugar content decreased following an initial increase. However, the root-shoot ratio, water use efficiency (WUE), intercellular CO2 concentration (Ci), superoxide dismutase (SOD) activity, peroxidase (POD) activity, and soluble protein content had inconsistent trend. When relative water content of soil decreased from 70% to 30%, the relative conductivity of leaf cells of two pomegranate cultivars was not significantly impacted, but the Pn in both of the cultivars was decreased from 17.117 μmol·m-2·s-1 and 15.783 μmol·m-2·s-1 to 4.583 μmol·m-2·s-1 and 5.033 μmol·m-2·s-1, respectively while the soluble sugar content of two pomegranate cultivars reached the highest value, 7.052% and 7.414% in Zhongnonghong and Tunisia, respectively. With continuous decrease in relative water content of soil below 30%, the Pn, Tr, WUE, Gs, and soluble sugar content of two pomegranate cultivars were significantly decreased, but there were a rising trend on the dry matter accumulation rate, Ci, relative leaf cell conductivity, SOD activity, soluble protein, and free proline content. In conclusion, under natural drought conditions, two studied pomegranate cultivars seedlings could maintain the normal growth when relative water content of soil is above 30%, however, if the relative water content of soil drops below 30%, these two pomegranate cultivars are likely to suffer serious injury or unrecoverable loss. |
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