Evaluation of factors contributing to diurnal changes in O<sub>2</sub> concentrations in floodwater of deepwater rice fields

Setter, Tim L.; Kupkanchanakul, T.; Waters, I.; Greenway, H.

doi:10.1111/j.1469-8137.1988.tb00248.x

Cited by 15 publications

(8 citation statements)

References 12 publications

(3 reference statements)

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“…Diurnal fluctuations of O 2 in the floodwater can result in hypoxic conditions at dawn following a night period where net O 2 uptake has occurred because of the system respiration (Setter et al . ). During the day, the O 2 produced by underwater photosynthesis by plants and microalgae can again raise the O 2 concentration that peaks in the late afternoon (Ram et al .…”

Section: Discussionmentioning

confidence: 97%

The mechanism of improved aeration due to gas films on leaves of submerged rice

Verboven

Pedersen

et al. 2014

Plant Cell & Environment

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Some terrestrial wetland plants, such as rice, have super-hydrophobic leaf surfaces which retain a gas film when submerged. O2 movement through the diffusive boundary layer (DBL) of floodwater, gas film and stomata into leaf mesophyll was explored by means of a reaction-diffusion model that was solved in a three-dimensional leaf anatomy model. The anatomy and dark respiration of leaves of rice (Oryza sativa L.) were measured and used to compute O2 fluxes and partial pressure of O2 (pO2 ) in the DBL, gas film and leaf when submerged. The effects of floodwater pO2 , DBL thickness, cuticle permeability, presence of gas film and stomatal opening were explored. Under O2 -limiting conditions of the bulk water (pO2 < 10 kPa), the gas film significantly increases the O2 flux into submerged leaves regardless of whether stomata are fully or partly open. With a gas film, tissue pO2 substantially increases, even for the slightest stomatal opening, but not when stomata are completely closed. The effect of gas films increases with decreasing cuticle permeability. O2 flux and tissue pO2 decrease with increasing DBL thickness. The present modelling analysis provides a mechanistic understanding of how leaf gas films facilitate O2 entry into submerged plants.

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Section: Discussionmentioning

confidence: 97%

The mechanism of improved aeration due to gas films on leaves of submerged rice

Verboven

Pedersen

et al. 2014

Plant Cell & Environment

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“…Combined field measurements have been operated in open chambers and mesocosms under a strict mixing regime under natural temperature and light conditions both for phytoplankton (e.g., Markager and Sand-Jensen, 1989), submerged aquatic plants (e.g., Liboriussen et al, 2005), and flooded terrestrial plants (e.g., Setter et al, 1988). …”

Section: Underwater Photosynthesis – Approaches and Methodsmentioning

confidence: 99%

Underwater Photosynthesis of Submerged Plants – Recent Advances and Methods

Pedersen¹,

Colmer²,

2013

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We describe the general background and the recent advances in research on underwater photosynthesis of leaf segments, whole communities, and plant dominated aquatic ecosystems and present contemporary methods tailor made to quantify photosynthesis and carbon fixation under water. The majority of studies of aquatic photosynthesis have been carried out with detached leaves or thalli and this selectiveness influences the perception of the regulation of aquatic photosynthesis. We thus recommend assessing the influence of inorganic carbon and temperature on natural aquatic communities of variable density in addition to studying detached leaves in the scenarios of rising CO2 and temperature. Moreover, a growing number of researchers are interested in tolerance of terrestrial plants during flooding as torrential rains sometimes result in overland floods that inundate terrestrial plants. We propose to undertake studies to elucidate the importance of leaf acclimation of terrestrial plants to facilitate gas exchange and light utilization under water as these acclimations influence underwater photosynthesis as well as internal aeration of plant tissues during submergence.

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“…Total submergence of shoots. Many amphibious and aquatic plants extend their internodes or petioles more quickly when completely submerged in water, thereby shortening the duration of submergence and decreasing the likelihood of asphyxiation by oxygen and carbon dioxide shortage , which is especially acute during the night (Setter et al 1988). A survey of several species of Rumex has linked their different abilities to survive submergence with, amongst other characteristics, the potential for increased elongation rates under water ).…”

Section: Promotion Of Shoot Extension By Submergencementioning

confidence: 99%