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- Title
Effects of NaCl stress on stomatal traits, leaf gas exchange parameters, and biomass of two tomato cultivars.
- Authors
GUO Li-li; HAO Li-hua; JIA Hui-hui; LI Fei; ZHANG Xi-xi; CAO Xu; XU Ming; ZHENG Yun-pu
- Abstract
To understand the mechanism underlying responses of stomatal traits, gas exchange parameters, and biomass of tomato plants to salt stress, two tomato cultivars (Shed and Alam) were treated by salt stress by adding NaCl (0.1 mol ⋅ L-1) to nutrition medium in environmental growth chambers for 90 days. Our results showed that salt stress substantially decreased the stomatal density, stomatal width, stomatal area, and stomatal area index of Shed by 32%, 45%, 25%, and 49%, respectively. The stomatal traits of Alam were not affected by NaCl treatment. The spatial scales of the regular stomatal distribution pattern of Shed and Alam were significantly decreased by 30% and 43%, and the nearest neighbor distance Lhat (d) of shed cultivar was increased by 20% under salt stress. NaCl stress resulted in marginal declines in the net photosynthetic rates (Pn), stomatal conductance (gs), transpiration rates (Tr) of both cultivars. The decrease of the photosynthetic rate of Shed under salt stress resulted from stomatal limitation, whereas the Pn of Alam was subjected to non-stomatal constraints. NaCl stress substantially decreased the seedling biomass of both cultivars, and the decline of belowground biomass was higher than that of aboveground biomass. Overall, our results suggested that the Alam cultivar is more salt-tolerant than Shed.
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2018, Vol 29, Issue 12, p3949
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201812.022