当前位置: X-MOL 学术Sci. Hortic. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Salinity acclimation ameliorates salt stress in tomato (Solanum lycopersicum L.) seedlings by triggering a cascade of physiological processes in the leaves
Scientia Horticulturae ( IF 4.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.scienta.2020.109434
Rowland Maganizo Kamanga , Kohei Echigo , Kensuke Yodoya , Ahmad Mohammad M. Mekawy , Akihiro Ueda

Abstract Salinity stress remains a major global impediment to agricultural productivity. Recent studies have shown that pre-exposure to mild stress primes plants against subsequent stress events, this is termed acclimation. However, it is not well-known if cultivar differences influence the salinity acclimation process. Moreover, the key regulatory physiological processes underlying salinity acclimation in tomato remain unclear. Hence the present study was aimed at investigating these phenomena. Tomato seedlings of acclimating (Rodede) and non-acclimating (NA, Heinz) cultivars were pre-treated with 0 (NPT) and 10 mM NaCl (PT) for 7 days and then subjected to 150 mM NaCl for 14 days under hydroponic conditions. Shoot dry weight and mean growth rate were remarkably improved only in acclimating cultivar Rodede while no significant differences were induced by PT in NA cultivar Heinz. These were coincidental with considerable reductions in leaf Na+ concentration in PT Rodede, but were nonetheless 2-folds higher than in Heinz. Therefore, the much better performance in acclimating cultivar points to an efficient sequestration of Na+ in the vacuole, thereby preventing cytosolic Na+ toxicity. This was further supported by hyperaccumulation of proline and activation of antioxidant enzymes in PT plants. Consequently, PT acclimating plants accumulated less H2O2 in leaves and suffered less membrane damage. Unlike in leaves, despite remarkable reductions in root Na+ concentration by PT in NA cultivar, lack of accompanying improvements in growth suggests that in tomatoes, key physiological processes underlying the acclimation process were operating in leaves.

中文翻译:

盐度驯化通过触发叶子中的一系列生理过程来改善番茄 (Solanum lycopersicum L.) 幼苗的盐胁迫

摘要 盐分胁迫仍然是全球农业生产力的主要障碍。最近的研究表明,预先暴露于轻度胁迫可以使植物抵御随后的胁迫事件,这被称为适应。然而,品种差异是否影响盐度适应过程尚不清楚。此外,番茄盐度适应的关键调节生理过程仍不清楚。因此,本研究旨在调查这些现象。驯化 (Rodede) 和非驯化 (NA, Heinz) 栽培品种的番茄幼苗用 0 (NPT) 和 10 mM NaCl (PT) 预处理 7 天,然后在水培条件下用 150 mM NaCl 处理 14 天。仅在驯化品种 Rodede 中,茎干重和平均生长率显着提高,而 PT 对 NA 品种 Heinz 的诱导没有显着差异。这些与 PT Rodede 叶片 Na+ 浓度的显着降低是巧合的,但仍然比 Heinz 高 2 倍。因此,在驯化品种方面更好的表现表明液泡中 Na+ 的有效螯合,从而防止了细胞溶质 Na+ 毒性。PT 植物中脯氨酸的过度积累和抗氧化酶的激活进一步支持了这一点。因此,适应 PT 的植物在叶子中积累的 H2O2 较少,受到的膜损伤也较少。与叶子不同,尽管在 NA 栽培品种中通过 PT 显着降低了根 Na+ 浓度,
更新日期:2020-08-01
down
wechat
bug