Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 67, Issue 21, Pages 6149-6159Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erw379
Keywords
Arabidopsis; lanthanum; primary root growth; reactive oxygen species; root system architecture
Categories
Funding
- Key Project of State Key Laboratory of Desert and Oasis Ecology
- China National Natural Sciences Foundation [31170228, 31272239]
- Yunnan Province Foundation for academic leader [2014HB043]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KSCX2-EW-Z-15]
- Hebei Province National Natural Sciences Foundation for Distinguished Young Scientists [C2013503042]
- Xinjiang Institute of Ecology and Geography of Chinese Academy of Sciences
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ROS is involved in lanthanum-modulated root development by inducing cell death in the root tips of primary roots.Although lanthanum (La) has been used as an agricultural plant growth stimulant for approximately 50 years, high concentrations are toxic to plants. Despite significant advances in recent years, the mechanisms underlying the effects of La on root system development remain unclear. Here, we report that a high concentration of La inhibits primary root (PR) elongation and induces lateral root (LR) development. La results in cell death in PR tips, thereby leading to the loss of meristematic cell division potential, stem cell niche activity, and auxin distribution in PR tips. Further analysis indicated that La induces reactive oxygen species (ROS) over-accumulation in PR tips. Reduction in ROS accumulation partially alleviated the inhibitory effects of La on PR elongation by improving cell survival in PR tips and thereby improving meristematic cell division potential and auxin distribution in PR tips. We also found ROS to be involved in La-induced endocytosis. Genetic analyses supported the described phenotype. Overall, our results indicate that La affects root growth, at least partially, by modulating ROS levels in roots to induce cell death in PR tips and subsequent auxin redistribution in roots, leading to remodeling of the root system architecture.
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