Yang Ting, Li Jihu, Mao Yongkai, Wu Han, Lin Mingjiang, Chen Lijuan
Institute of Nanfan and Seed Industry, Guangdong Academy of Sciences, Guangzhou, 510316 Guangdong People's Republic of China.
Physiol Mol Biol Plants. 2024 Oct;30(10):1659-1671. doi: 10.1007/s12298-024-01511-z. Epub 2024 Oct 15.
Rhamnolipids (RLs) are bioactive compounds that have gained a lot of attention for their potential applications in agriculture. However, the exploration of RLs in passion fruit plants remains limited. This study aimed to investigate the role of RLs in passion fruit plants growth and defense responses. Firstly, the results demonstrated that RLs act as plant growth regulators, significantly enhancing the survival rate and root system development of passion fruit seedlings propagated by cutting. Further analyses suggested that RLs may enhance photosynthetic capacity and modulate the accumulation of indoleacetic acid (IAA) and cytokinin (CTK) in passion fruit cuttings, thereby promoting plant growth and development. Additionally, this study revealed that RLs effectively reduced susceptibility to viral pathogen telosma mosaic virus (TeMV) in passion fruit plants compared to distilled water-pretreated controls, resulting in alleviated disease symptoms. Significant up-regulation of antioxidative enzyme activities and reducing substances were observed in RL's-pretreated plants upon TeMV-inoculation compared to distilled water-pretreated ones. Moreover, RLs were found to promote other defense-related signaling pathways upon TeMV-inoculation in passion fruit plants, including salicylic acid (SA) accumulation and expression levels of defense-related genes such as pathogenesis-related gene (), phenylalanine ammonia-lyase (), transcription factors (TFs) and . Collectively, these findings underscored the positive roles played by RLs both in promoting growth and eliciting defense responses within passion fruit plants. These results provided valuable insights for designing environment-friendly management strategies for cutting propagation as well as prevention and control measures against viral diseases in passion fruits.
The online version contains supplementary material available at 10.1007/s12298-024-01511-z.
鼠李糖脂（RLs）是一类生物活性化合物，因其在农业中的潜在应用而备受关注。然而，在西番莲属植物中对鼠李糖脂的研究仍然有限。本研究旨在探究鼠李糖脂在西番莲属植物生长和防御反应中的作用。首先，结果表明鼠李糖脂可作为植物生长调节剂，显著提高扦插繁殖的西番莲幼苗的成活率和根系发育。进一步分析表明，鼠李糖脂可能增强西番莲插条的光合能力，并调节吲哚乙酸（IAA）和细胞分裂素（CTK）的积累，从而促进植物生长发育。此外，本研究还表明，与蒸馏水预处理的对照相比，鼠李糖脂能有效降低西番莲属植物对病毒病原体夜来香花叶病毒（TeMV）的易感性，从而减轻病害症状。与蒸馏水预处理的植株相比，接种TeMV后，经鼠李糖脂预处理的植株中抗氧化酶活性和还原物质显著上调。此外，发现在西番莲属植物接种TeMV后，鼠李糖脂能促进其他与防御相关的信号通路，包括水杨酸（SA）的积累以及病程相关基因（）、苯丙氨酸解氨酶（）、转录因子（TFs）和等防御相关基因的表达水平。总的来说，这些发现强调了鼠李糖脂在促进西番莲属植物生长和引发防御反应方面所起的积极作用。这些结果为设计环保的扦插繁殖管理策略以及西番莲病毒病的防控措施提供了有价值的见解。
在线版本包含可在10.1007/s12298-024-01511-z获取的补充材料。
