Abstract
Abstract Plants have adapted a number of mechanisms to cope with widespread phosphorus (P) deficiency in arable lands. Crop species and even cultivars differ widely in one or more of these adaptive mechanisms hence, in P efficiency. Identification of these mechanisms is pre-requisite for long term breeding programs. Two independent experiments were conducted to study the possible mechanisms of P efficiency in Brassica cultivars. Eight Brassica cultivars ('B.S.A.', 'Toria', 'Toria Selection', 'Brown Raya', 'Peela Raya', 'Dunkeld', 'Rainbow', and 'CON-1') were selected on the basis of differences in growth under P deficiency from preliminary experiment. In the first experiment, cultivars were grown for 40 days in sand supplied either with sparingly soluble phosphate rock (PR) or soluble mono-ammonium phosphate (MAP). Cultivars differed significantly (P<0.05) for biomass production, P contents and P use efficiency. Low P availability in PR treatment resulted in significantly lower dry weights and P contents than those grown with MAP. The cultivars 'Rainbow', 'Brown Raya' and 'Dunkeld' accumulated more biomass (3.2 g/pot) and P contents (3.0 mg/pot) than other cultivars when grown with PR. Root dry weight was significantly correlated with shoot dry weight, shoot P content and total P content (r > 0.65) indicating significance of improved root growth for P acquisition. While in the second experiment cultivars were grown with adequate P for 30 days and then P was withdrawn from the nutrient solution by replacing fresh P free nutrient solution for 10 days. Induced P deficiency increased P contents in young leaves by two folds indicating remobilization of P from older leaves and shoot. Nonetheless cultivars varied for remobilization but differences in P remobilization could not explain the differences in P utilization efficiency among cultivars. Hence further experimentation to study root morphology, P uptake, and organic acid exudation by these cultivars in relation to P deficiency is recommended. Keywords: genetic variabilityP utilizationP remobilizationphosphate rock ACKNOWLEDGMENTS The financial help for this project was provided by Higher Education Commission to the senior author under Ph.D. merit scholarship program.
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Claims 11
Claim · model-written summary
Brassica cultivars differed significantly in biomass production, phosphorus content, and phosphorus use efficiency.
- Outcome
- biomass production, P contents and P use efficiencye0
BrassicaNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivars differed significantly (P<0.05) for biomass production, P contents and P use efficiency.”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Phosphate rock supply produced lower dry weights than mono-ammonium phosphate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low P availability in PR treatment resulted in significantly lower dry weights and P contents than those grown with MAP.”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Phosphate rock supply produced lower phosphorus content than mono-ammonium phosphate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low P availability in PR treatment resulted in significantly lower dry weights and P contents than those grown with MAP.”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Rainbow, Brown Raya, and Dunkeld accumulated more biomass than other cultivars with phosphate rock.
- Material
- 'Rainbow', 'Brown Raya' and 'Dunkeld'e0
- Treatment
- PRe0
- Outcome
- biomasse0
- Direction
- moree0
- Value
- 3.2 g/pote0
- Comparator
- other cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivars 'Rainbow', 'Brown Raya' and 'Dunkeld' accumulated more biomass (3.2 g/pot) and P contents (3.0 mg/pot) than other cultivars when grown with PR.”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Rainbow, Brown Raya, and Dunkeld accumulated more phosphorus than other cultivars with phosphate rock.
- Material
- 'Rainbow', 'Brown Raya' and 'Dunkeld'e0
- Treatment
- PRe0
- Outcome
- P contentse0
- Direction
- moree0
- Value
- 3.0 mg/pote0
- Comparator
- other cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivars 'Rainbow', 'Brown Raya' and 'Dunkeld' accumulated more biomass (3.2 g/pot) and P contents (3.0 mg/pot) than other cultivars when grown with PR.”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Root dry weight correlated with shoot dry weight.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weight was significantly correlated with shoot dry weight, shoot P content and total P content (r > 0.65)”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Root dry weight correlated with shoot phosphorus content.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weight was significantly correlated with shoot dry weight, shoot P content and total P content (r > 0.65)”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Root dry weight correlated with total phosphorus content.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root dry weight was significantly correlated with shoot dry weight, shoot P content and total P content (r > 0.65)”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Induced phosphorus deficiency doubled phosphorus content in young leaves.
- Treatment
- Induced P deficiencye0
- Outcome
- P contents in young leavese0
- Direction
- increasede0
- Value
- two foldse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Induced P deficiency increased P contents in young leaves by two folds”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Cultivars varied in phosphorus remobilization.
- Outcome
- remobilizatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nonetheless cultivars varied for remobilization”
e1“mechanisms of P efficiency in Brassica cultivars”
Claim · model-written summary
Differences in phosphorus remobilization did not explain cultivar differences in phosphorus utilization efficiency.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences in P remobilization could not explain the differences in P utilization efficiency among cultivars”
e1“mechanisms of P efficiency in Brassica cultivars”
The same questions in other papers
phosphorus · nutrient: content · BrassicaPositive and negative results
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1 paper more in this group
See all 5 papers →phosphorus · growth · BrassicaPositive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
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