Abstract
Both temperature and soil moisture vary greatly in the surface layers of the soil through which seedlings grow following germination. The work presented studied the impact of these environmental variables on post-germination carrot growth to nominal seedling emergence. The rapid pre-crook downward growth of both the hypocotyl and root was consistent with their requirement for establishment in soil drying from the surface. At all temperatures, both hypocotyl and root growth rates decreased as water stress increased and there was a very distinct temperature optimum that tended to occur at lower temperatures as water stress increased. A model based on the thermodynamics of reversible protein denaturation was adapted to include the effects of water potential in order to describe these growth rate responses. In general, the percentage of seedlings that reached the crook stage (start of upward hypocotyl growth) decreased at the extremes of the temperature range used and was progressively reduced by increasing water stress. A model was developed to describe this response based on the idea that each seedling within a population has lower and upper temperature thresholds and a water potential threshold which define the conditions within which it is able to grow. This threshold modelling approach which applies growth rates within a distribution of temperature and water potential thresholds could be used to simulate seedling growth by dividing time into suitable units.
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Claims 5
Claim · model-written summary
Pre-crook downward growth of the carrot hypocotyl and root was rapid.
- Taxon
- carrot
Daucus carotae0 - Organ / stage
- hypocotyl and roote1
- Outcome
- pre-crook downward growthe1
- Qualifier
- establishment in soil drying from the surfacee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-germination carrot growth”
e1“The rapid pre-crook downward growth of both the hypocotyl and root was consistent with their requirement for establishment in soil drying from the surface”
Claim · model-written summary
Hypocotyl and root growth rates of carrot decreased as water stress increased, at all temperatures.
- Taxon
- carrotDaucus carotae0
- Organ / stage
- hypocotyl and roote2
- Treatment
- water stresse2
- Outcome
- hypocotyl and root growth ratese2
- Direction
- decreasede2
- Qualifier
- At all temperaturese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-germination carrot growth”
e2“At all temperatures, both hypocotyl and root growth rates decreased as water stress increased”
Claim · model-written summary
The carrot temperature optimum for growth occurred at lower temperatures as water stress increased.
- Taxon
- carrotDaucus carotae0
- Treatment
- water stresse3
- Outcome
- temperature optimume3
- Direction
- lowere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-germination carrot growth”
e3“there was a very distinct temperature optimum that tended to occur at lower temperatures as water stress increased”
Claim · model-written summary
The percentage of carrot seedlings reaching the crook stage decreased at the extremes of the temperature range.
- Taxon
- carrotDaucus carotae0
- Organ / stage
- crook stagee4
- Treatment
- extremes of the temperature range usede4
- Outcome
- percentage of seedlings that reached the crook stagee4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-germination carrot growth”
e4“the percentage of seedlings that reached the crook stage (start of upward hypocotyl growth) decreased at the extremes of the temperature range used”
Claim · model-written summary
The percentage of carrot seedlings reaching the crook stage was progressively reduced by increasing water stress.
- Taxon
- carrotDaucus carotae0
- Organ / stage
- crook stagee4
- Treatment
- increasing water stresse5
- Outcome
- percentage of seedlings that reached the crook stagee4
- Direction
- progressively reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-germination carrot growth”
e4“the percentage of seedlings that reached the crook stage (start of upward hypocotyl growth) decreased at the extremes of the temperature range used”
e5“was progressively reduced by increasing water stress”
The same questions in other papers
drought · growth · Daucus carota (carrot)Positive and negative results
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- positive
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See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.