Abstract
Zinc and phosphorus are essential nutrients with low bioavailability in calcareous soils. Some plants exude organicacids 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 onlyunder 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 8
Claim · model-written summary
Under Zn deficiency, rapeseed cultivars lost about 80% of shoot fresh weight.
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 Zn 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 cultivars 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 onlyunder phosphorus deficiency.”
Claim · model-written summary
Rapeseed cultivars exuded citrate only under phosphorus deficiency.
Not reportedDirection
Verbatim
e0“Both lupin and rapeseed cultivars exuded citrate onlyunder phosphorus deficiency.”
Claim · model-written summary
Feodora exuded citrate at 3.89 μmol g-1 RDW h-1 under phosphorus deficiency.
- Material
- Feodorae0
- Treatment
- phosphorus deficiencye1
- Outcome
- exudation ratese0
- Value
- 3.89 μmol g-1 RDW h-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
e1“Both lupin and rapeseed cultivars exuded citrate onlyunder phosphorus deficiency.”
Claim · model-written summary
Energy exuded citrate at 3.45 μmol g-1 RDW h-1 under phosphorus deficiency.
- Material
- Energye0
- Treatment
- phosphorus deficiencye1
- Outcome
- exudation ratese0
- Value
- 3.45 μmol g-1 RDW h-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
e1“Both lupin and rapeseed cultivars exuded citrate onlyunder phosphorus deficiency.”
Claim · model-written summary
Dunkeld exuded citrate at 15.1 μmol g-1 RDW h-1 under phosphorus deficiency.
Verbatim
e0“while that of Dunkeld was 15.1 μmol g-1 RDW h-1”
e1“Both lupin and rapeseed cultivars exuded citrate onlyunder phosphorus deficiency.”
e2“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”
Claim · model-written summary
Lupin lost production under Zn deficiency without organic acid exudation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lupin and rapeseed lost their production under Zn deficiency but they did not exude organic acid”
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This paper is about lacking the nutrient, so it counts the other way round here.
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