Abstract
Plants acquire phosphorus (P) primarily as inorganic phosphate (Pi) from the soil. Under Pi deficiency, plants induce an array of physiological and morphological responses, termed phosphate starvation response (PSR), thereby increasing Pi acquisition and use efficiency. However, the mechanisms by which plants adapt to Pi deficiency remain to be elucidated. Here, we report that deposition of a β-1,3-glucan polymer called callose is induced in Arabidopsis thaliana root hairs under Pi deficiency, in a manner independent of PSR-regulating PHR1/PHL1 transcription factors and LPR1/LPR2 ferroxidases. Genetic studies revealed PMR4 (GSL5) callose synthase being required for the callose deposition in Pi-depleted root hairs. Loss of PMR4 also reduces Pi acquisition in shoots and plant growth under low Pi conditions. The defects are not recovered by simultaneous disruption of SID2, mediating defense-associated salicylic acid (SA) biosynthesis, excluding SA defense activation from the cause of the observed pmr4 phenotypes. Grafting experiments and characterization of plants expressing PMR4 specifically in root hair cells suggest that a PMR4 pool in the cell type contributes to shoot growth under Pi deficiency. Our findings thus suggest an important role for PMR4 in plant adaptation to Pi deficiency.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-nc-nd. Read at the source ↗
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 6
Claim · model-written summary
Phosphate deficiency induces callose deposition in Arabidopsis root hairs independently of PHR1/PHL1 and LPR1/LPR2.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Organ / stage
- root hairse0
- Treatment
- Pi deficiencye0
- Gene
- PHR1/PHL1e0
- Outcome
- callosee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deposition of a β-1,3-glucan polymer called callose is induced in Arabidopsis thaliana root hairs under Pi deficiency, in a manner independent of PSR-regulating PHR1/PHL1 transcription factors and LPR1/LPR2 ferroxidases”
Claim · model-written summary
PMR4 is required for callose deposition in phosphate-depleted root hairs.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- root hairse0
- Gene
- PMR4e0
- Outcome
- callose depositione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PMR4 (GSL5) callose synthase being required for the callose deposition in Pi-depleted root hairs”
t0“Arabidopsis thaliana”
Claim · model-written summary
Loss of PMR4 reduces shoot phosphate acquisition under low phosphate.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- Loss of PMR4e0
- Gene
- PMR4e0
- Outcome
- Pi acquisition in shootse0
- Direction
- reducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loss of PMR4 also reduces Pi acquisition in shoots and plant growth under low Pi conditions.”
t0“Arabidopsis thaliana”
Claim · model-written summary
Loss of PMR4 reduces plant growth under low phosphate.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- Loss of PMR4e0
- Gene
- PMR4e0
- Outcome
- plant growthe0
- Direction
- reducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loss of PMR4 also reduces Pi acquisition in shoots and plant growth under low Pi conditions.”
t0“Arabidopsis thaliana”
Claim · model-written summary
Disrupting SID2 did not recover the pmr4 defects.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- simultaneous disruption of SID2e0
- Gene
- SID2e0
- Outcome
- The defectse0
- Direction
- not recoverede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The defects are not recovered by simultaneous disruption of SID2, mediating defense-associated salicylic acid (SA) biosynthesis”
t0“Arabidopsis thaliana”
Claim · model-written summary
Root hair PMR4 appears to contribute to shoot growth during phosphate deficiency.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- PMR4e0
- Outcome
- shoot growthe0
- Qualifier
- under Pi deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a PMR4 pool in the cell type contributes to shoot growth under Pi deficiency”
t0“Arabidopsis thaliana”
The same questions in other papers
phosphorus · molecular: metabolites · Arabidopsis thaliana (thale cress)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- negative
- negative
3 papers more in this group
See all 7 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.