背景:农业中优质水的利用日益受到气候变化的制约,影响可用性,质量,以及由于降水模式改变而产生的分布,蒸发增加,极端天气事件,和不断上升的盐度水平。盐度极大地挑战了生菜等对盐敏感的蔬菜,特别是在温室里。水培水质确保营养液的稳定性,增强营养吸收,防止污染,调节pH和电导率,并维护系统组件。本研究旨在通过应用生物刺激剂减轻通过漂浮培养方法在50mMNaCl盐度下生长的莴苣中的盐诱导损伤。
结果:我们检查了生菜的生理,生物化学,和施用生物刺激剂如氨基酸后对盐胁迫的农艺反应,丛枝菌根真菌,植物生长促进根际细菌(PGPR),富里酸,和壳聚糖。实验是在温室中进行的,采用随机完全区组设计,每个治疗重复四次。生物刺激剂的应用减轻了盐对植物重量的有害影响,高度,叶数,和叶面积。在50mMNaCl下产率增加了75%,51%,31%,34%,33%的人使用蚯蚓粪,PGPR,富里酸,氨基酸,和壳聚糖,分别。生物刺激剂提高了气孔导度(58-189%),叶绿素含量(4-10%),营养吸收(15-109%),和水状态(9-107%)。它们还将MDA含量降低了26-42%。PGPR(1.0mlL-1),蚯蚓粪(2毫升升1),富里酸(40毫克升1)特别有效,促进增长,产量,苯酚,和矿物质含量,同时在盐水条件下降低硝酸盐含量。
结论:生物刺激剂激活了抗氧化防御系统,提供一个可持续的,缓解水培莴苣盐胁迫的经济有效解决方案。
BACKGROUND: The utilization of high-quality water in agriculture is increasingly constrained by climate change, affecting availability, quality, and distribution due to altered precipitation patterns, increased evaporation, extreme weather events, and rising salinity levels. Salinity significantly challenges salt-sensitive vegetables like lettuce, particularly in a greenhouse. Hydroponics water quality ensures nutrient solution stability, enhances nutrient uptake, prevents contamination, regulates pH and electrical conductivity, and maintains system components. This study aimed to mitigate salt-induced damage in lettuce grown via the floating culture method under 50 mM NaCl salinity by applying biostimulants.
RESULTS: We examined lettuce\'s physiological, biochemical, and agronomical responses to salt stress after applying biostimulants such as amino acids, arbuscular mycorrhizal fungi, plant growth-promoting rhizobacteria (PGPR), fulvic acid, and chitosan. The experiment was conducted in a greenhouse with a randomized complete block design, and each treatment was replicated four times. Biostimulant applications alleviated salt\'s detrimental effects on plant weight, height, leaf number, and leaf area. Yield increases under 50 mM NaCl were 75%, 51%, 31%, 34%, and 33% using vermicompost, PGPR, fulvic acid, amino acid, and chitosan, respectively. Biostimulants improved stomatal conductance (58-189%), chlorophyll content (4-10%), nutrient uptake (15-109%), and water status (9-107%). They also reduced MDA content by 26-42%. PGPR (1.0 ml L‒1), vermicompost (2 ml L‒1), and fulvic acid (40 mg L‒1) were particularly effective, enhancing growth, yield, phenol, and mineral content while reducing nitrate levels under saline conditions.
CONCLUSIONS: Biostimulants activated antioxidative defense systems, offering a sustainable, cost-effective solution for mitigating salt stress in hydroponic lettuce cultivation.