Oxygen in the air and oxygen dissolved in the floodwater both sustain growth of aquatic adventitious roots in rice
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Oxygen in the air and oxygen dissolved in the floodwater both sustain growth of aquatic adventitious roots in rice. / Lin, Chen; Peralta Ogorek, Lucas León; Pedersen, Ole; Sauter, Margret.
In: Journal of Experimental Botany, Vol. 72, No. 5, eraa542, 2021, p. 1879-1890.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Oxygen in the air and oxygen dissolved in the floodwater both sustain growth of aquatic adventitious roots in rice
AU - Lin, Chen
AU - Peralta Ogorek, Lucas León
AU - Pedersen, Ole
AU - Sauter, Margret
PY - 2021
Y1 - 2021
N2 - Flooding is an environmental stress that leads to a shortage of O2 that can be detrimental for plants. When flooded, deepwater rice grow floating adventitious roots to replace the dysfunctional soil-borne root system, but the features that ensure O2 supply and hence growth of aquatic roots have not been explored. We investigate the sources of O2 in aquatic adventitious roots and relate aerenchyma and barriers for gas diffusion to local O2 gradients, as measured by microsensor technology, to link O2 distribution in distinct root zones to their anatomical features. The mature root part receives O2 exclusively from the stem. It has aerenchyma that, together with suberin and lignin depositions at the water–root and cortex–stele interfaces, provides a path for longitudinal O2 movement toward the tip. The root tip has no diffusion barriers and receives O2 from the stem and floodwater, resulting in improved aeration of the root tip over mature tissues. Local formation of aerenchyma and diffusion barriers in the mature root channel O2 towards the tip which also obtains O2 from the floodwater. These features explain aeration of floating roots and their ability to grow under water.
AB - Flooding is an environmental stress that leads to a shortage of O2 that can be detrimental for plants. When flooded, deepwater rice grow floating adventitious roots to replace the dysfunctional soil-borne root system, but the features that ensure O2 supply and hence growth of aquatic roots have not been explored. We investigate the sources of O2 in aquatic adventitious roots and relate aerenchyma and barriers for gas diffusion to local O2 gradients, as measured by microsensor technology, to link O2 distribution in distinct root zones to their anatomical features. The mature root part receives O2 exclusively from the stem. It has aerenchyma that, together with suberin and lignin depositions at the water–root and cortex–stele interfaces, provides a path for longitudinal O2 movement toward the tip. The root tip has no diffusion barriers and receives O2 from the stem and floodwater, resulting in improved aeration of the root tip over mature tissues. Local formation of aerenchyma and diffusion barriers in the mature root channel O2 towards the tip which also obtains O2 from the floodwater. These features explain aeration of floating roots and their ability to grow under water.
U2 - 10.1093/jxb/eraa542
DO - 10.1093/jxb/eraa542
M3 - Journal article
C2 - 33206163
VL - 72
SP - 1879
EP - 1890
JO - Journal of Experimental Botany
JF - Journal of Experimental Botany
SN - 0022-0957
IS - 5
M1 - eraa542
ER -
ID: 251739068