Surviving floods: leaf gas films improve O2 and CO2 exchange, root aeration, and growth of completely submerged rice

Ole Pedersen; Sarah Meghan Rich; Timothy David Colmer

doi:10.1111/j.1365-313X.2008.03769.x

Surviving floods: leaf gas films improve O₂ and CO₂ exchange, root aeration, and growth of completely submerged rice

Ole Pedersen, Sarah Meghan Rich, Timothy David Colmer

Freshwater Biology

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

142 Citationer (Scopus)

Abstract

Udgivelsesdato: April 2009

Originalsprog	Engelsk
Tidsskrift	Plant Journal
Vol/bind	58
Udgave nummer	1
Sider (fra-til)	147-156
ISSN	0960-7412
DOI	https://doi.org/10.1111/j.1365-313X.2008.03769.x
Status	Udgivet - 2009

Bibliografisk note

KEYWORDS
plastrons • diffusive boundary layers • underwater photosynthesis • internal aeration • submergence tolerance • Oryza sativa

Adgang til dokumentet

10.1111/j.1365-313X.2008.03769.x

Citationsformater

@article{84f8fda01ad911df8ed1000ea68e967b,

title = "Surviving floods: leaf gas films improve O2 and CO2 exchange, root aeration, and growth of completely submerged rice",

abstract = "When completely submerged, the leaves of some species retain a surface gas film. Leaf gas films on submerged plants have recently been termed 'plant plastrons', analogous with the plastrons of aquatic insects. In aquatic insects, surface gas layers (i.e. plastrons) enlarge the gas–water interface to promote O2 uptake when under water; however, the function of leaf gas films has rarely been considered. The present study demonstrates that gas films on leaves of completely submerged rice facilitate entry of O2 from floodwaters when in darkness and CO2 entry when in light. O2 microprofiles showed that the improved gas exchange was not caused by differences in diffusive boundary layers adjacent to submerged leaves with or without gas films; instead, reduced resistance to gas exchange was probably due to the enlarged water–gas interface (cf. aquatic insects). When gas films were removed artificially, underwater net photosynthesis declined to only 20% of the rate with gas films present, such that, after 7 days of complete submergence, tissue sugar levels declined, and both shoot and root growth were reduced. Internal aeration of roots in anoxic medium, when shoots were in aerobic floodwater in darkness or when in light, was improved considerably when leaf gas films were present. Thus, leaf gas films contribute to the submergence tolerance of rice, in addition to those traits already recognized, such as the shoot-elongation response, aerenchyma and metabolic adjustments to O2 deficiency and oxidative stress.",

author = "Ole Pedersen and Rich, {Sarah Meghan} and Colmer, {Timothy David}",

note = "KEYWORDS plastrons • diffusive boundary layers • underwater photosynthesis • internal aeration • submergence tolerance • Oryza sativa",

year = "2009",

doi = "10.1111/j.1365-313X.2008.03769.x",

language = "English",

volume = "58",

pages = "147--156",

journal = "Plant Journal",

issn = "0960-7412",

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TY - JOUR

T1 - Surviving floods: leaf gas films improve O2 and CO2 exchange, root aeration, and growth of completely submerged rice

AU - Pedersen, Ole

AU - Rich, Sarah Meghan

AU - Colmer, Timothy David

N1 - KEYWORDS plastrons • diffusive boundary layers • underwater photosynthesis • internal aeration • submergence tolerance • Oryza sativa

PY - 2009

Y1 - 2009

N2 - When completely submerged, the leaves of some species retain a surface gas film. Leaf gas films on submerged plants have recently been termed 'plant plastrons', analogous with the plastrons of aquatic insects. In aquatic insects, surface gas layers (i.e. plastrons) enlarge the gas–water interface to promote O2 uptake when under water; however, the function of leaf gas films has rarely been considered. The present study demonstrates that gas films on leaves of completely submerged rice facilitate entry of O2 from floodwaters when in darkness and CO2 entry when in light. O2 microprofiles showed that the improved gas exchange was not caused by differences in diffusive boundary layers adjacent to submerged leaves with or without gas films; instead, reduced resistance to gas exchange was probably due to the enlarged water–gas interface (cf. aquatic insects). When gas films were removed artificially, underwater net photosynthesis declined to only 20% of the rate with gas films present, such that, after 7 days of complete submergence, tissue sugar levels declined, and both shoot and root growth were reduced. Internal aeration of roots in anoxic medium, when shoots were in aerobic floodwater in darkness or when in light, was improved considerably when leaf gas films were present. Thus, leaf gas films contribute to the submergence tolerance of rice, in addition to those traits already recognized, such as the shoot-elongation response, aerenchyma and metabolic adjustments to O2 deficiency and oxidative stress.

AB - When completely submerged, the leaves of some species retain a surface gas film. Leaf gas films on submerged plants have recently been termed 'plant plastrons', analogous with the plastrons of aquatic insects. In aquatic insects, surface gas layers (i.e. plastrons) enlarge the gas–water interface to promote O2 uptake when under water; however, the function of leaf gas films has rarely been considered. The present study demonstrates that gas films on leaves of completely submerged rice facilitate entry of O2 from floodwaters when in darkness and CO2 entry when in light. O2 microprofiles showed that the improved gas exchange was not caused by differences in diffusive boundary layers adjacent to submerged leaves with or without gas films; instead, reduced resistance to gas exchange was probably due to the enlarged water–gas interface (cf. aquatic insects). When gas films were removed artificially, underwater net photosynthesis declined to only 20% of the rate with gas films present, such that, after 7 days of complete submergence, tissue sugar levels declined, and both shoot and root growth were reduced. Internal aeration of roots in anoxic medium, when shoots were in aerobic floodwater in darkness or when in light, was improved considerably when leaf gas films were present. Thus, leaf gas films contribute to the submergence tolerance of rice, in addition to those traits already recognized, such as the shoot-elongation response, aerenchyma and metabolic adjustments to O2 deficiency and oxidative stress.

U2 - 10.1111/j.1365-313X.2008.03769.x

DO - 10.1111/j.1365-313X.2008.03769.x

M3 - Journal article

C2 - 19077169

VL - 58

SP - 147

EP - 156

JO - Plant Journal

JF - Plant Journal

SN - 0960-7412

IS - 1

ER -