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| Effects of water stress on physiological characteristics during tomato seedlings period |
| HAO Shuxue, CAO Hongxia, WANG Hubing, PAN Xiaoyan |
| Northwest A&F University, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China |
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Abstract The aim of this study was to investigate the response on the physiological characteristics of tomato seedlings under water stress, providing theoretical reference for the water management and irrigation schedule during tomato seedlings period. The tomato type which selected for experiment was “Changfeng No.5”, and there were four water levels: full irrigation, mild, moderate and severe water stress. The indexes were measured every five days for a total of 20 days. The results indicated that under the water stress condition, the maximal photochemical efficiency(Fv/Fm), photochemical quenching coefficient(qP)and electron transport rate(ETR)decreased remarkably, and the performance of all the treatments was: T>T1>T2>T3. On the other hand, the stomatal density, length and width of T1, T2 and T3 decreased a lot compared to the control. Furthermore, the stomata deeply closed under severe water stress. The leaf antioxidant enzyme activities increased with the increasing of water stress levels. The physiological parameters that under the mild water stress have no obviously discrepancy compare to CK. Therefore, the reference irrigation regime: 50%~60% of field capacity can be used for reference in the tomato seedling stage.
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Received: 10 May 2018
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