Journal
NEW PHYTOLOGIST
Volume 229, Issue 1, Pages 156-172Publisher
WILEY
DOI: 10.1111/nph.16816
Keywords
ABC transporter; Arabidopsis thaliana; cuticle; flooding stress; hyperhydricity; true leaf development; wax; waterlogging
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [2018R1A2A1A05018173]
- Research Grants Council of Hong Kong [GRF14121019, AoE/M-05/12, C4002-17G]
- Rural Development Administration, Republic of Korea [10953092019]
- Chinese University of Hong Kong [14101218]
- National Research Foundation, Korea [NRF-2019R1A2B5B02070204]
- National Research Foundation of Korea [4299990314078, 2019R1A2B5B02070204, 2018R1A2A1A05018173] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Under waterlogged conditions, abgc5 mutant seedlings exhibit severe developmental problems, suggesting that the dense cuticle layer formed by ABCG5 is essential for proper plant development in waterlogged conditions.
Germination requires sufficient water absorption by seeds, but excessive water in the soil inhibits plant growth. We therefore hypothesized that tolerance mechanisms exist that help young seedlings survive and develop in waterlogged conditions. Many ATP-BINDING CASSETTE TRANSPORTER subfamily G (ABCG) proteins protect terrestrial plants from harsh environmental conditions. To establish whether any of these proteins facilitate plant development under waterlogged conditions, we observed the early seedling growth of many ABCG transporter mutants under waterlogged conditions. abcg5seedlings exhibited severe developmental problems under waterlogged conditions: the shoot apical meristem was small, and the seedling failed to develop true leaves. The seedlings had a high water content and reduced buoyancy on water, suggesting that they were unable to retain air spaces on and inside the plant. Supporting this possibility,abcg5cotyledons had increased cuticle permeability, reduced cuticular wax contents, and a much less dense cuticle layer than the wild-type. These results indicate that proper development of plants under waterlogged conditions requires the dense cuticle layer formed by ABCG5 activity.
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