Abstract
Adventitious roots of rice (Oryza sativa) acclimatize to root-zone O(2) deficiency by increasing porosity, and induction of a barrier to radial O(2) loss (ROL) in basal zones, to enhance longitudinal O(2) diffusion towards the root tip. Changes in root-zone gas composition that might induce these acclimatizations, namely low O(2), elevated ethylene, ethylene-low O(2) interactions, and high CO(2), were evaluated in hydroponic experiments. Neither low O(2) (0 or 0.028 mol m(-3) O(2)), ethylene (0.2 or 2.0 microl l(-1)), or combinations of these treatments, induced the barrier to ROL. This lack of induction of the barrier to ROL was despite a positive response of aerenchyma formation to low O(2) and elevated ethylene. Carbon dioxide at 10 kPa had no effect on root porosity, the barrier to ROL, or on growth. Our findings that ethylene does not induce the barrier to ROL in roots of rice, even though it can enhance aerenchyma formation, shows that these two acclimatizations for improved root aeration are differentially regulated.
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Claims 4
Claim · model-written summary
Low O2, ethylene, or their combinations did not induce the barrier to radial oxygen loss in rice roots.
- Taxon
- rice
Oryza sativat0 - Treatment
- low O(2) (0 or 0.028 mol m(-3) O(2))e1
- Outcome
- barrier to ROLe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Root aeration in rice”
e1“Neither low O(2) (0 or 0.028 mol m(-3) O(2)), ethylene (0.2 or 2.0 microl l(-1)), or combinations of these treatments, induced the barrier to ROL”
Claim · model-written summary
Low O2 and elevated ethylene gave a positive response in aerenchyma formation in rice roots.
- Taxon
- riceOryza sativat0
- Treatment
- low O(2) and elevated ethylenee2
- Outcome
- aerenchyma formatione2
- Direction
- positive responsee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Root aeration in rice”
e2“This lack of induction of the barrier to ROL was despite a positive response of aerenchyma formation to low O(2) and elevated ethylene”
Claim · model-written summary
Carbon dioxide at 10 kPa had no effect on root porosity, the barrier to radial oxygen loss, or growth of rice.
- Taxon
- riceOryza sativat0
- Treatment
- Carbon dioxide at 10 kPae3
- Outcome
- root porosity, the barrier to ROL, or on growthe3
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Root aeration in rice”
e3“Carbon dioxide at 10 kPa had no effect on root porosity, the barrier to ROL, or on growth”
Claim · model-written summary
Ethylene-induced aerenchyma and the radial O2 loss barrier in rice roots are differentially regulated.
- Taxon
- riceOryza sativat0
- Compound
- ethylenee4
- Outcome
- these two acclimatizations for improved root aeration are differentially regulatede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Root aeration in rice”
e4“ethylene does not induce the barrier to ROL in roots of rice, even though it can enhance aerenchyma formation, shows that these two acclimatizations for improved root aeration are differentially regulated”
The same questions in other papers
co2 · growth · Oryza sativa (rice)Positive and negative results
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