Abstract
Roots often continue to elongate while shoot growth is inhibited in plants subjected to low-water potentials. The cause of this differential response to water deficit was investigated. We examined hypocotyl and root growth, polysome status and mRNA populations, and abscisic acid (ABA) content in etiolated soybean (Glycine max [L.] Merr. cv Williams) seedlings whose growth was inhibited by transfer to low-water potential vermiculite or exogenous ABA. Both treatments affected growth and dry weight in a similar fashion. Maximum inhibition of hypocotyl growth occurred when internal ABA levels (modulated by ABA application) reached the endogenous level found in the elongating zone of seedlings grown in water-deficient vermiculite. Conversely, root growth was affected to only a slight extent in low-water potential seedlings and by most ABA treatments (in some, growth was promoted). In every seedling section examined, transfer of seedlings into low-water potential vermiculite caused ABA levels to increase approximately 5- to 10-fold over that found in well-watered seedlings. Changes in soluble sugar content, polysome status, and polysome mRNA translation products seen in low-water potential seedlings did not occur with ABA treatments sufficient to cause significant inhibition of hypocotyl elongation. These data suggest that both variation in endogenous ABA levels, and differing sensitivity to ABA in hypocotyls and roots can modulate root/shoot growth ratios. However, exogenous ABA did not induce changes in sugar accumulation, polysome status, and mRNA populations seen after transfer into low-water potential vermiculite.
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Claims 6
Claim · model-written summary
Water deficit and ABA similarly affected growth and dry weight.
- Taxon
- soybean
Glycine maxt0 - Outcome
- growth and dry weighte0
- Direction
- affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both treatments affected growth and dry weight in a similar fashion.”
t0“Soybean”
Claim · model-written summary
Hypocotyl growth inhibition peaked when ABA reached the level in water deficient seedlings.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- hypocotyle0
- Compound
- internal ABAe0
- Outcome
- hypocotyl growthe0
- Direction
- Maximum inhibitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum inhibition of hypocotyl growth occurred when internal ABA levels (modulated by ABA application) reached the endogenous level found in the elongating zone of seedlings grown in water-deficient vermiculite.”
t0“Soybean”
Claim · model-written summary
Root growth was only slightly affected by low water potential and most ABA treatments.
- Taxon
- soybeanGlycine maxt0
- Outcome
- root growthe0
- Direction
- affected to only a slight extente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth was affected to only a slight extent in low-water potential seedlings and by most ABA treatments”
t0“Soybean”
Claim · model-written summary
Some ABA treatments promoted root growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ABA treatmentse0
- Outcome
- growthe0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by most ABA treatments (in some, growth was promoted)”
t0“Soybean”
Claim · model-written summary
Low water potential raised ABA five to tenfold throughout sampled sections.
- Taxon
- soybeanGlycine maxt0
- Treatment
- low-water potential vermiculitee0
- Outcome
- ABA levelse0
- Direction
- increasee0
- Value
- approximately 5- to 10-folde0
- Comparator
- well-watered seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“transfer of seedlings into low-water potential vermiculite caused ABA levels to increase approximately 5- to 10-fold over that found in well-watered seedlings.”
t0“Soybean”
Claim · model-written summary
ABA treatment did not reproduce the soluble sugar, polysome or translation changes from water deficit.
- Taxon
- soybeanGlycine maxt0
- Treatment
- ABA treatmentse0
- Outcome
- soluble sugar content, polysome status, and polysome mRNA translation productse0
- Direction
- did not occure0
- Comparator
- low-water potential seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Changes in soluble sugar content, polysome status, and polysome mRNA translation products seen in low-water potential seedlings did not occur with ABA treatments sufficient to cause significant inhibition of hypocotyl elongation.”
t0“Soybean”
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