Properties of root water transport in canola ( Brassica napus ) subjected to waterlogging at the seedling, flowering and
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Properties of root water transport in canola (Brassica napus) subjected to waterlogging at the seedling, flowering and podding growth stages Mengmeng Liu & Xiangfeng Tan & Xuehui Sun & Janusz J. Zwiazek
Received: 12 May 2020 / Accepted: 5 August 2020 # Springer Nature Switzerland AG 2020
Abstract Aims The objective was to clarify the role of root water transport in waterlogged canola plants. We examined the hypothesis that waterlogging triggers root suberization and lignification, which reduces the effectiveness of apoplastic bypass and increases the dependence of roots on the aquaporin-mediated water transport, and that this effect varies depending on the growth stage. Methods Brassica napus plants at the seedling, flowering and podding growth stages were waterlogged for up to 8 days. Growth, gas exchange, leaf water potentials, and root hydraulic conductance were measured in addition to relative contributions of the aquaporin-mediated and apoplastic root water transport, gene expression levels of plasma membrane intrinsic proteins (BnPIPs), and lignin and suberin deposition in roots. Results Waterlogging decreased dry weights, gas exchange, leaf water potentials and root hydraulic conductivity more in plants at the seedling stage than other growth stages. It also accelerated root suberization and lignification resulting in an increase of a relative Responsible Editor: Stefan K. Arndt. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04669-z) contains supplementary material, which is available to authorized users. M. Liu : X. Tan : X. Sun : J. J. Zwiazek (*) Department of Renewable Resources, University of Alberta, 442 Earth Sciences Building, Edmonton T6G 2E3, Canada e-mail: [email protected]
contribution of aquaporin-mediated water transport. The transcript levels of BnPIPs increased with an increasing duration of waterlogging. Conclusions Effects on root water transport played an important role in the sensitivity of canola seedlings to waterlogging. Increased relative contribution of aquaporin-mediated water transport in waterlogged plants was accompanied by enhanced root suberization and lignification. The evidence points to the importance of maintaining functional aquaporins in plant survival of waterlogging. Keywords Apoplastic pathway . Aquaporins . Gas exchange . Root hydraulic conductance . Water relations
Introduction Waterlogging is a major constraint to plant growth and survival across the globe, especially in the areas with high precipitation and poor soil drainage. It is also a common factor limiting the productivity of many agricultural crops including canola (Brassica napus) (Perboni et al. 2012). Canola is one of the most important oilseed crops in the world including Canada. The crop is seeded shortly after the snowmelt in Canada and as a rice rotation crop in paddy fields in China (Xu et al. 2015b), which leads to high risks of waterlogging. Distinct yield reductions in canola may occur after 3 to 30 days of flooding
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