| Effects of salt stress on plant growth and stoichiometric characteristics of C, N, P and K of grafted watermelon seedlings |
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| DOI：10.7606/j.issn.1000-7601.2020.02.24 |
| Key Words: NaCl stress stoichiometric characteristics grafted watermelon seedling salt adaption |
| Author Name | Affiliation | | SUN Xiaomei | College of resources and environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Sijin | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Liuyan | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | Li Jinxia | College of resources and environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHOU Bin | College of resources and environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Nianlai | College of resources and environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the salt adaptability of grafted watermelon with blight resistance and to obtain a combination of salt tolerance with blight tolerance, an experiment was conducted to investigate the effects of NaCl stress on biomass per plant, photosynthesis, water use efficiency (WUE), leaf stoichiometric characteristics among own\|root seedling of Jingxinerhao and two grafted watermelon seedling \[(Bj-6×893)+ Jingxinerhao\] and \[(Bj-9×341)+ Jingxinerhao\]. The findings showed that grafted watermelon seedlings had lower shoot\|root ratio, photosynthesis, and C∶N ratio than those in \[(Bj-6×893)+ Jingxinerhao\] (9.6%, 44.2% and 15.5%) and \[(Bj-9×341)+ Jingxinerhao\] (21.1%, 30.1% and 23.0%). While biomass per plant, photosynthesis, potassium concentration and C∶P ratio in \[(Bj-9×341)+ Jingxinerhao\] were significantly lower than those in \[(Bj-6×893)+ Jingxinerhao\] by 9.7%, 20.2%, 70.3%, and 24.9%, respectively. Compared to control, salt stress significantly decreased photosynthesis (60.3%, 45.8% and 41.9%) and C∶K ratio (48.2%, 35.2% and 59.4%) in own\|root seedling, \[(Bj-6×893)+ Jingxinerhao\] and \[(Bj-9×341)+ Jingxinerhao\], while significantly increased potassium concentration by 44.8%, 27.8%, and 56.8% in the materials. The WUE significantly increased with salt addition by 33.5% and 14.3% in \[(Bj-6×893)+ Jingxinerhao\] and\[(Bj-9×341)+ Jingxinerhao\]. Salt stress had significant positive effect on C∶N (18.7%) and C∶P (15.5%) in \[(Bj-9×341)+ Jingxinerhao\]. Based on above results and redundancy analysis，own\|root seedling may improve its salt tolerance with increasing potassium concentration, while two grafted seedlings may simultaneously enhance WUE and potassium concentrations to improve their salt tolerance. The salt tolerance of grafted seedlings \[(Bj-6×893)+ Jingxinerhao\] was greater than that of \[(Bj-9×341)+ Jingxinerhao\]. |
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