ABSTRACT

Previous studies found that non-uniform salt stress could alleviate salt damage to plants compared to uniform salt treatment. The root system of tomato was divided into two parts, including salt-free treatment (NaCl concentrations were zero in both root systems), non-uniform salt stress with a NaCl concentration of 0.1% in one side of the roots (0.1%, 0.3%; 0.1%, 0.5%), non-uniform salt stress with a NaCl concentration of 0.2% in one side of the roots (0.2%, 0.4%), and uniform salt stress (0.2%, 0.2%; 0.3%, 0.3%) treatments. Compared with uniform stress, Na⁺ content in leaves decreased significantly (P < 0.05). The photosynthetic capacity of plants was significantly improved under the conditions of non-uniform salt treatment, which was mainly reflected in photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr). Under mild salt stress, the stem and leaf weight of T13 in the non-uniform salt treatment increased by 7.60%, the yield per plant increased by 2.35%, and the total soluble sugar content increased by 6.85% compared with the uniform salt treatment T22. Under moderate salt stress, the stem and leaf weights of T15 and T24 in the non-uniform salt treatment increased by 14.62% and 5.77% compared with the uniform salt treatment T33, the yield per plant increased 6.04% and 3.49%, and the total soluble sugar content increased 18.94% and 7.97%. The study on the response of tomato under non-uniform saltinity was an important supplement to plant physiology under uniform saltinity, so as to provide references for cultivation and management in salt fields.

摘要

先前的研究发现，与均匀盐处理相比，非均匀盐胁迫可以减轻盐对植物的损害。番茄根系分为两部分，包括无盐处理（两个根系的NaCl浓度均为零），非均匀盐胁迫，根部一侧的NaCl浓度为0.1%（0.1%、0.3 %; 0.1%, 0.5%), 根一侧 NaCl 浓度为 0.2% 的非均匀盐胁迫 (0.2%, 0.4%) 和均匀盐胁迫 (0.2%, 0.2%; 0.3%, 0.3 %) 治疗。与均匀应力相比，Na ⁺叶中含量显着降低（P < 0.05）。非均匀盐处理条件下植物光合能力显着提高，主要体现在光合速率（Pn）、气孔导度（Gs）和蒸腾速率（Tr）上。轻度盐胁迫下，与均盐处理T22相比，非均盐处理T13茎叶重增加7.60%，单株产量增加2.35%，总可溶性糖含量增加6.85% . 中等盐分胁迫下，非均匀盐处理T15和T24的茎叶重较均匀盐处理T33分别增加14.62%和5.77%，单株产量分别增加6.04%和3.49%，总可溶性糖含量分别增加18.94%和7.97%。