Abstract
Zinc and phosphorus are essential nutrients with low bioavailability in calcareous soils. Some plants exude organic acids to increase the solubility of these two nutrients. The objective of this study was to examine citrate exudation rates of different lupin (Feodora and Energy) and rapeseed (Dunkeld, Yickadee and Rainbow) cultivars under deficiencies of Zn and P. The plants were cultivated into three different nutrient solutions (complete, -Zn, and -P) with pH around 7. Under Zn deficiency, rapeseed cultivars lost about 80% of its shoot fresh weight, but the roots did not exude any organic acids such as citrate, malate or oxalate. Both lupin and rapeseed cultivars exuded citrate only under phosphorus deficiency. The exudation rates of Feodora and Energy were 3.89 μmol g-1 RDW h-1 and 3.45 μmol g-1 RDW h-1, respectively, while that of Dunkeld was 15.1 μmol g-1 RDW h-1. The results indicated that lupin and rapeseed lost their production under Zn deficiency but they did not exude organic acid, while under P deficiency both plants exuded citrate. Keywords: Citrate; deficiency; exudation rate; lupin; phosphorus; rapeseed; Zn [ How to Cite : Siane BAE. 2012. Citrate Root Exudation under Zn and P Deficiency. J Trop Soils , 17 (3) : 219-225. doi: 10.5400/jts.2012.17.3.219] [ Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.219 ]
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Claims 7
Claim · model-written summary
Zinc deficiency reduced rapeseed cultivar shoot fresh weight by about 80%.
- Taxon
- rapeseede0
- Material
- rapeseed cultivarse0
- Treatment
- Zn deficiencye0
- Outcome
- shoot fresh weighte0
- Direction
- loste0
- Value
- 80%e0
Not reportedComparator
Verbatim
e0“Under Zn deficiency, rapeseed cultivars lost about 80% of its shoot fresh weight”
Claim · model-written summary
Rapeseed roots did not exude citrate, malate or oxalate under zinc deficiency.
- Taxon
- rapeseede0
- Organ / stage
- rootse0
- Treatment
- Zn deficiencye0
- Outcome
- did not exude any organic acids such as citrate, malate or oxalatee0
Not reportedDirection
Verbatim
e0“Under Zn deficiency, rapeseed cultivars lost about 80% of its shoot fresh weight, but the roots did not exude any organic acids such as citrate, malate or oxalate.”
Claim · model-written summary
Lupin exuded citrate only under phosphorus deficiency.
LupinusNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both lupin and rapeseed cultivars exuded citrate only under phosphorus deficiency.”
Claim · model-written summary
Rapeseed exuded citrate only under phosphorus deficiency.
Not reportedDirection
Verbatim
e0“Both lupin and rapeseed cultivars exuded citrate only under phosphorus deficiency.”
Claim · model-written summary
Feodora citrate exudation was 3.89 μmol g-1 RDW h-1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different lupin (Feodora and Energy) and rapeseed (Dunkeld, Yickadee and Rainbow) cultivars”
e1“The exudation rates of Feodora and Energy were 3.89 μmol g-1 RDW h-1 and 3.45 μmol g-1 RDW h-1, respectively, while that of Dunkeld was 15.1 μmol g-1 RDW h-1.”
Claim · model-written summary
Energy citrate exudation was 3.45 μmol g-1 RDW h-1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different lupin (Feodora and Energy) and rapeseed (Dunkeld, Yickadee and Rainbow) cultivars”
e1“The exudation rates of Feodora and Energy were 3.89 μmol g-1 RDW h-1 and 3.45 μmol g-1 RDW h-1, respectively, while that of Dunkeld was 15.1 μmol g-1 RDW h-1.”
Claim · model-written summary
Dunkeld citrate exudation was 15.1 μmol g-1 RDW h-1.
Verbatim
e0“different lupin (Feodora and Energy) and rapeseed (Dunkeld, Yickadee and Rainbow) cultivars”
e1“The exudation rates of Feodora and Energy were 3.89 μmol g-1 RDW h-1 and 3.45 μmol g-1 RDW h-1, respectively, while that of Dunkeld was 15.1 μmol g-1 RDW h-1.”
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This paper is about lacking the nutrient, so it counts the other way round here.
- negative
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