Stomatal closure in oxygen-stressed plants

Sojka, R.E. (1992) Stomatal closure in oxygen-stressed plants. Soil Science. 154:269-280.

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Abstract

Stomatal closure of plants in flooded soil,
as determined by leaf gas exchange, has
been recognized since 1973, and for simple
hypoxia since 1975. At least 58 species
have been shown to close stomata with hypoxic
or flooded conditions. Various factors
interact to affect the relationship between
rhizosphere oxygen availability, as
measured by soil oxygen diffusion rate
(ODR), and degree of stomatal closure.
These factors include root temperature,
species, plant growth stage, plant mineral
nutrition, and duration and nature of hypoxia.
Soil water content, bulk density,
and temperature also influence ODR. Abscisic
acid accumulation in leaves appears
to induce stomatal closure, as a stress response
to root hypoxia, through its effect
on potassium ion regulation of guard cell
turgor. Stomatal closure generally persists
well beyond actual soil hypoxia. Photosynthesis
is reduced by root hypoxia, both by
reduction of leaf gas exchange and by a
lowering of the photosynthetic rate at a
given leaf gas exchange rate. This phenomenon
deserves greater attention in evaluating
and modelling of crop response to soil
hypoxia and as a sensitive indicator of severity
of soil hypoxic stress.

Item Type:	Article
NWISRL Publication Number:	0787
Subjects:	Mass Import - unclassified
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:53
Last Modified:	01 Dec 2016 22:31
Item ID:	588
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/588