Abstract
Phenotypic plasticity enables plants to adjust their morphology and phenology to variable environments. Although potentially important for crop breeding and management, the physiology and genetics of plasticity traits are poorly understood, and few models exist for their study. In the previous paper of this series, the structural-functional model EcoMeristem was described and field validated for vegetative-stage rice. This study applies the model to an experimental study on phosphorus deficiency effects on two morphologically contrasting rice cultivars, IR64 and Azucena, grown in controlled environments under hydroponics culture. Phosphorus deficiency caused severe biomass growth reductions in the shoot but not in the root, thus increasing the root / shoot weight ratio. It also inhibited tiller formation and leaf elongation, prolonged the phyllochron, and increased carbohydrate reserve pools in the plant. Analysis aided by the model identified inhibition of leaf extension and tillering as primary effects of the stress. Physiological feedback probably led to longer phyllochron, greater reserve accumulation and root growth stimulation. The main effect of P deficiency appeared to be a reduction in demand for assimilates in the shoot while photosynthetic radiation use efficiency remained nearly constant, resulting in spill-over of excess assimilates into reserve compartments and root growth. The results are discussed in the light of future applications of EcoMeristem for phenotyping and genetic analyses of phenotypic plasticity.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Phosphorus deficiency severely reduced shoot biomass growth.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- shoote0
- Treatment
- Phosphorus deficiencye0
- Outcome
- biomass growthe0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus deficiency caused severe biomass growth reductions in the shoot but not in the root”
t0“rice”
Claim · model-written summary
Phosphorus deficiency did not reduce root biomass growth.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote0
- Treatment
- Phosphorus deficiencye0
- Outcome
- biomass growthe0
- Direction
- not in the roote0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus deficiency caused severe biomass growth reductions in the shoot but not in the root”
t0“rice”
Claim · model-written summary
Phosphorus deficiency increased the root to shoot weight ratio.
- Taxon
- riceOryza sativat0
- Treatment
- phosphorus deficiencyt0
- Outcome
- root / shoot weight ratioe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus increasing the root / shoot weight ratio”
t0“rice. 2. Simulating genotype responses to phosphorus deficiency”
Claim · model-written summary
Phosphorus deficiency inhibited tiller formation and leaf elongation.
- Taxon
- riceOryza sativat0
- Treatment
- phosphorus deficiencyt0
- Outcome
- tiller formation and leaf elongatione0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It also inhibited tiller formation and leaf elongation”
t0“rice. 2. Simulating genotype responses to phosphorus deficiency”
Claim · model-written summary
Phosphorus deficiency prolonged the phyllochron.
- Taxon
- riceOryza sativat0
- Treatment
- phosphorus deficiencyt0
- Outcome
- phyllochrone0
- Direction
- prolongede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prolonged the phyllochron”
t0“rice. 2. Simulating genotype responses to phosphorus deficiency”
Claim · model-written summary
Phosphorus deficiency increased carbohydrate reserve pools.
- Taxon
- riceOryza sativat0
- Treatment
- phosphorus deficiencyt0
- Outcome
- carbohydrate reserve poolse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased carbohydrate reserve pools in the plant”
t0“rice. 2. Simulating genotype responses to phosphorus deficiency”
Claim · model-written summary
Model-aided analysis identified inhibited leaf extension and tillering as primary stress effects.
- Taxon
- riceOryza sativat0
- Outcome
- inhibition of leaf extension and tilleringe0
- Qualifier
- primary effects of the stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis aided by the model identified inhibition of leaf extension and tillering as primary effects of the stress”
t0“rice”
Claim · model-written summary
Physiological feedback probably led to longer phyllochron, reserve accumulation and root growth stimulation.
- Taxon
- riceOryza sativat0
- Outcome
- longer phyllochron, greater reserve accumulation and root growth stimulatione0
- Qualifier
- Physiological feedbacke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Physiological feedback probably led to longer phyllochron, greater reserve accumulation and root growth stimulation”
t0“rice”
Claim · model-written summary
The main P deficiency effect appeared to be reduced shoot assimilate demand.
- Taxon
- riceOryza sativat0
- Treatment
- P deficiencye0
- Outcome
- demand for assimilates in the shoote0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“main effect of P deficiency appeared to be a reduction in demand for assimilates in the shoot”
t0“rice”
Claim · model-written summary
Photosynthetic radiation use efficiency remained nearly constant.
- Taxon
- riceOryza sativat0
- Outcome
- photosynthetic radiation use efficiencye0
- Direction
- remained nearly constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthetic radiation use efficiency remained nearly constant”
t0“rice”
Claim · model-written summary
Excess assimilates appeared to spill into reserves and root growth.
- Taxon
- riceOryza sativat0
- Outcome
- reserve compartments and root growthe0
- Qualifier
- spill-over of excess assimilatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spill-over of excess assimilates into reserve compartments and root growth”
t0“rice”
The same questions in other papers
phosphorus · growth · Oryza sativa (rice)Positive and negative results
132 papers in the same direction as this paper · 32 in the opposite direction · 1 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
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See all 166 papers →phosphorus · yield · Oryza sativa (rice)Positive and negative results
418 papers in the same direction as this paper · 46 in the opposite direction · 10 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- positive
- no effect
471 papers more in this group
See all 475 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.