Growth, Photosynthesis, and Gene Expression of Bermudagrass in Response to Salinity and Shade Stress

IF 1.2 4区 农林科学 Q3 HORTICULTURE
Xiaoyan Liu, Xiao Xu, Mingxia Ji, Erick Amombo, Jinmin Fu
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引用次数: 0

Abstract

Soil salinization is an environmental problem globally. Bermudagrass (Cynodon dactylon) has long been used for soil restoration in saline-alkali land. Urbanization and the compound planting pattern combining trees, bushes, and grasses induced shading are becoming one of the most significant environmental constraints on the management of bermudagrass, which directly affects photosynthetic characteristics. Salinity and shade have become the most important environmental constraints on lawn development and implementation. Previous studies have shown that the plant physiological response under combined stress was different from that under single stress. The purpose of this research was to investigate the effects of salinity stress, shade stress, and the combined stress on bermudagrass. Shade nets were used to simulate shade stress to 85% shade. The NaCl concentration gradient for salinity stress was 1.0% for 7 days, 1.5% for 7 days, and 2.0% for 13 days, respectively. The combined stress combines the two approaches mentioned previously. The results showed that the salinity stress significantly inhibited the plant height, leaf relative water content, chlorophyll content, the chlorophyll a fluorescence induction (OJIP) curve and other photosynthetic parameters of bermudagrass while increasing electrolyte leakage when compared with control. Shade stress significantly enhanced the plant height, chlorophyll content, electrolyte leakage, the OJIP curve, and other photosynthetic parameters. Under the combined stress, the plant height and relative water content did not change significantly, but the photosynthetic parameters such as chlorophyll content and the OJIP curve increased. Furthermore, under the combined stress, the photosynthesis-related genes were regulated. Salinity stress inhibited the photosynthetic ability of bermudagrass more than shade stress, while the combined stress exhibited a considerably better photosynthetic ability. These findings provide information for the usage of bermudagrass in salinized shade conditions.
百慕草生长、光合作用及基因表达对盐度和荫凉胁迫的响应
土壤盐碱化是全球性的环境问题。狗牙根(Cynodon dactylon)长期以来一直被用于盐碱地的土壤修复。城市化和树木、灌木和草相结合的复合种植模式正在成为狗牙根管理的最重要的环境制约因素之一,这直接影响了狗牙根的光合特性。盐碱和荫蔽已成为制约草坪开发和实施的最重要的环境因素。以往的研究表明,复合胁迫下植物的生理反应与单一胁迫下不同。本研究的目的是研究盐度胁迫、遮荫胁迫和复合胁迫对狗牙根的影响。遮荫网用于模拟遮荫应力至85%遮荫。盐度胁迫的NaCl浓度梯度分别为7天1.0%、7天1.5%和13天2.0%。组合应力结合了前面提到的两种方法。结果表明,与对照相比,盐度胁迫显著抑制了狗牙根的株高、叶片相对含水量、叶绿素含量、叶绿素a荧光诱导曲线等光合参数,同时增加了电解质渗漏。遮荫胁迫显著提高了株高、叶绿素含量、电解质渗漏、OJIP曲线等光合参数。在复合胁迫下,株高和相对含水量没有显著变化,但叶绿素含量和OJIP曲线等光合参数增加。此外,在复合胁迫下,光合作用相关基因受到调控。盐度胁迫比遮荫胁迫更能抑制狗牙根的光合能力,而复合胁迫表现出更好的光合性能。这些发现为狗牙根在盐碱遮荫条件下的使用提供了信息。
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来源期刊
CiteScore
3.80
自引率
0.00%
发文量
31
审稿时长
2 months
期刊介绍: The Journal of the American Society for Horticultural Science publishes papers on the results of original research on horticultural plants and their products or directly related research areas. Its prime function is to communicate mission-oriented, fundamental research to other researchers. The journal includes detailed reports of original research results on various aspects of horticultural science and directly related subjects such as: - Biotechnology - Developmental Physiology - Environmental Stress Physiology - Genetics and Breeding - Photosynthesis, Sources-Sink Physiology - Postharvest Biology - Seed Physiology - Postharvest Biology - Seed Physiology - Soil-Plant-Water Relationships - Statistics
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