Abstract
Although Phosphite (PO_3; Phi) has recently been marketed as “superior P fertilizer” for a wide range of crops, the claim regarding its potential as a fertilizer is controversial. In this study, effects of Phi at both low (0.2 mM) and high (2 mM) rates on growth and phosphorus (P) supply of celery (Apium graveolens var. dulce) were investigated under either low phosphate (PO_4; Pi) (0.1 mM) or high Pi (0.5 mM) supply. The effect of Phi was found to be strongly dependent on the P nutrient status of the plants. Addition of Phi at both rates did not influence growth of high Pi-supplied plants. However, Phi at 2 mM significantly decreased both shoot and root growth of low Pi-supplied plants. Plants grown in this treatment showed bleaching of young leaves and death of root tips and root hairs as typical toxic symptoms of Phi. Shoot P concentration was highly increased by root application of Phi, suggesting that Phi was well absorbed by roots and mobile inside the plants but also corroborating that Phi did not provide P nutrition to celery plants. No beneficial effect on plant growth was detected from the use of this material.
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Claims 6
Claim · model-written summary
Phosphite at both rates did not influence growth of celery supplied with high phosphate.
- Taxon
- celery
%2C_Elswick%2C_Northumberland_4.jpg?width=60)
Apium graveolens Dulce Groupe6 - Treatment
- Phi at both ratese1
- Outcome
- growthe1
- Direction
- did not influencee1
- Qualifier
- high Pi-supplied plantse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
%2C_Elswick%2C_Northumberland_4.jpg?width=500)
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e1“Addition of Phi at both rates did not influence growth of high Pi-supplied plants”
Claim · model-written summary
Phosphite at 2 mM significantly decreased shoot and root growth of celery supplied with low phosphate.
- Taxon
- celeryApium graveolens Dulce Groupe6
- Treatment
- Phi at 2 mMe2
- Outcome
- shoot and root growthe2
- Direction
- decreasede2
- Qualifier
- low Pi-supplied plantse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e2“However, Phi at 2 mM significantly decreased both shoot and root growth of low Pi-supplied plants”
Claim · model-written summary
Phosphite at 2 mM caused bleaching of young leaves and death of root tips and root hairs as toxic symptoms.
- Taxon
- celeryApium graveolens Dulce Groupe6
- Treatment
- Phie0
- Outcome
- bleaching of young leaves and death of root tips and root hairse0
- Qualifier
- typical toxic symptomse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e0“Plants grown in this treatment showed bleaching of young leaves and death of root tips and root hairs as typical toxic symptoms of Phi”
Claim · model-written summary
Root application of phosphite highly increased shoot P concentration.
- Taxon
- celeryApium graveolens Dulce Groupe6
- Treatment
- root application of Phie3
- Outcome
- Shoot P concentratione3
- Direction
- highly increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e3“Shoot P concentration was highly increased by root application of Phi”
Claim · model-written summary
Phosphite did not provide P nutrition to celery plants.
- Taxon
- celeryApium graveolens Dulce Groupe6
- Treatment
- Phie4
- Outcome
- P nutritione4
- Direction
- did not providee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e4“corroborating that Phi did not provide P nutrition to celery plants”
Claim · model-written summary
Use of this material gave no beneficial effect on celery growth.
- Taxon
- celeryApium graveolens Dulce Groupe6
- Treatment
- this materiale5
- Outcome
- plant growthe5
- Direction
- No beneficial effecte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“supply of celery (Apium graveolens var. dulce)”
e5“No beneficial effect on plant growth was detected from the use of this material”