4.7 Article

Foliar water uptake via cork warts in mangroves of the Sonneratia genus

期刊

PLANT CELL AND ENVIRONMENT
卷 44, 期 9, 页码 2925-2937

出版社

WILEY
DOI: 10.1111/pce.14129

关键词

dehydration; kinetics; pathway; sclereids; seasonality; surface conductance

资金

  1. Australian Research Council [DP170104091, DP180102969, DP150104437]

向作者/读者索取更多资源

A novel foliar water uptake pathway was characterized in Sonneratia species, with slow and steady rates of water uptake over a 12-hour period. Leaf conductance to surface water (K-surf) increased with longer leaf wetting durations and more negative leaf water potentials at the start of wetting, but declined by 68% between wet and dry seasons. Results suggest that foliar water uptake via cork warts may be rate limited and regulated in Sonneratia sp.
Foliar water uptake (FWU) occurs in plants of diverse ecosystems; however, the diversity of pathways and their associated FWU kinetics remain poorly resolved. We characterized a novel FWU pathway in two mangrove species of the Sonneratia genus, S. alba and S. caseolaris. Further, we assessed the influence of leaf wetting duration, wet-dry seasonality and leaf dehydration on leaf conductance to surface water (K-surf). The symplastic tracer dye, disodium fluorescein, revealed living cells subtending and encircling leaf epidermal structures known as cork warts as a pathway of FWU entry into the leaf. Rehydration kinetics experiments revealed a novel mode of FWU, with slow and steady rates of water uptake persistent over a duration of 12 hr. K-surf increased with longer durations of leaf wetting and was greater in leaves with more negative water potentials at the initiation of leaf wetting. K-surf declined by 68% between wet and dry seasons. Our results suggest that FWU via cork warts in Sonneratia sp. may be rate limited and under active regulation. We conclude that FWU pathways in halophytes may require ion exclusion to avoid uptake of salt when inundated, paralleling the capacity of halophyte roots for ion selectivity during water acquisition.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据