Chen Youjun, Chen Chen, Zhou Qingping, Hu Jian, Lei Yingxia, Liu Wenhui
Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station, Chengdu, China.
Institute of the Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu, China.
Front Plant Sci. 2022 Jan 28;12:785971. doi: 10.3389/fpls.2021.785971. eCollection 2021.
The rhizosheath is a critical interface supporting the exchange of resources between plants and their associated environment of soil. Favorable microenvironment of rhizosphere soil provides the rhizosheath formed and then promotes desert plant survival. However, it remains unclear how rhizosheath benefits the colonization of pioneer plants in alpine desert under changing environment. In this study, we investigated the effect of different soil moisture and sterilization treatments (three moisture levels and unsterilized or sterilized soil) on rhizosheath forming process of (), a sand-inhabiting and drought-resistant pioneer plant of the Tibetan Plateau desert. The results showed that in both unsterilized and sterilized soil, increasing soil moisture first increased and then decreased rhizosheath weight, with the highest value is 25%. During rhizosheath formation, developing rhizosheaths were selectively enriched in the bacterial genera and . These suggest the existence of a highly specialized signal recognition system during rhizosheath formation that involves the accumulation of bacteria. These bacterial species exhibited different roles in the process of rhizosheath formation and is an advantageous strategy for .
根鞘是支持植物与其相关土壤环境之间资源交换的关键界面。根际土壤的有利微环境促使根鞘形成，进而促进沙漠植物的存活。然而，在不断变化的环境下，根鞘如何有利于高寒沙漠先锋植物的定殖仍不清楚。在本研究中，我们调查了不同土壤水分和灭菌处理（三种水分水平以及未灭菌或灭菌土壤）对青藏高原沙漠的一种沙生耐旱先锋植物——（此处原文物种名缺失）根鞘形成过程的影响。结果表明，在未灭菌和灭菌土壤中，土壤水分增加时根鞘重量先增加后降低，最高值为25%。在根鞘形成过程中，发育中的根鞘在细菌属 和 中被选择性富集。这些表明在根鞘形成过程中存在一个高度专业化的信号识别系统，该系统涉及细菌的积累。这些细菌物种在根鞘形成过程中发挥着不同作用，并且是（此处原文内容不完整）的一种有利策略。
