An Xia, Chen Jie, Liu Tingting, Li Wenlue, Luo Xiahong, Zou Lina
Zhejiang Xiaoshan Institute of Cotton & Bast Fiber Crops, Zhejiang Institute of Landscape Plants and Flowers, Zhejiang Academy of Agricultural Sciences, Hangzhou 311251, China.
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Plants (Basel). 2022 May 29;11(11):1448. doi: 10.3390/plants11111448.
Kenaf ( L.) is an indispensable fiber crop that faces increasing salinity stress. In previous studies regarding the molecular mechanisms of how kenaf may respond to salt stress, no metabolic evidences have been reported. Meanwhile, studies regarding kenaf stems under adverse growth conditions have not been conducted. In the present study, multiple-layer evidences including physiological, transcriptomic, and metabolic data regarding how kenaf stems were affected by the salt stress are provided, wherein the stem growth, especially the lignification process, is retarded. Meanwhile, the transcriptomic data indicated genes involved in the photosynthesis are significantly repressed while the multiple flavonoid metabolism genes are enriched. As to the metabolic data, the content variation for the growth-promotion phytohormones such as IAA and the stress-responding ones including ABA are within or without expectations, implying these phytohormones played complicated roles when the kenaf stems encounter salt stress. However, the metabolite variations did not always agree with the expression levels of corresponding key pathway genes, possibly because the metabolite could be biosynthesized or catabolized in multiple pathways. Collectively, our data may enlighten, more specifically, downstream studies on kenaf responses against salinity and other adverse conditions.
红麻（L.）是一种不可或缺的纤维作物，面临着日益增加的盐胁迫。在先前关于红麻如何应对盐胁迫的分子机制的研究中，尚未报道代谢方面的证据。同时，尚未开展关于红麻茎在不利生长条件下的研究。在本研究中，提供了包括生理、转录组和代谢数据在内的多层证据，以说明盐胁迫如何影响红麻茎，其中茎的生长，尤其是木质化过程受到抑制。同时，转录组数据表明参与光合作用的基因受到显著抑制，而多种类黄酮代谢基因则富集。关于代谢数据，促进生长的植物激素如吲哚乙酸（IAA）以及应激响应激素如脱落酸（ABA）的含量变化符合或不符合预期，这意味着这些植物激素在红麻茎遭遇盐胁迫时发挥了复杂的作用。然而，代谢物变化并不总是与相应关键途径基因的表达水平一致，这可能是因为代谢物可以通过多种途径进行生物合成或分解代谢。总体而言，我们的数据可能更具体地启发关于红麻对盐度和其他不利条件响应的下游研究。
