Aluminum-induced high IAA concentration may explain the Al susceptibility in Citrus limonia

Aluminum-induced high IAA concentration may explain the Al susceptibility in Citrus limonia

In acidic soils (pH < 5.0), aluminum (Al) occurs as Al 3+ , which is phytotoxic and reduces the root growth by hormonal imbalance and/or cell wall rigidity. However, the explanations for the decrease in root growth are not clear. A 60-day study was held with ‘Rangpur’ lime ( Citrus limonia ) plan...

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Bibliographic Details
Published in:Plant growth regulation Vol. 87; no. 1; pp. 123 - 137
Main Authors: Silva, Carolina M. S., Cavalheiro, Mariana F., Bressan, Anna C. G., Carvalho, Brenda M. O., Banhos, Otavia F. A. A., Purgatto, Eduardo, Harakava, Ricardo, Tanaka, Francisco A. O., Habermann, Gustavo
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-01-2019
Springer Nature B.V
Subjects:
Acidic soils
Agriculture
Aluminum
Biomedical and Life Sciences
Cell walls
Citrate synthase
Citrus limonia
Exudation
Gene expression
Genes
Indoleacetic acid
Life Sciences
Original Paper
Pectin
Pectinesterase
Plant Anatomy/Development
Plant growth
Plant Physiology
Plant Sciences
Rigidity
Soil lime
Auxin
‘Rangpur’ lime
Al
Efflux channels
Gene expression
Root growth
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Summary:In acidic soils (pH < 5.0), aluminum (Al) occurs as Al 3+ , which is phytotoxic and reduces the root growth by hormonal imbalance and/or cell wall rigidity. However, the explanations for the decrease in root growth are not clear. A 60-day study was held with ‘Rangpur’ lime ( Citrus limonia ) plants grown in nutrient solution containing 0 and 1480 µM Al. We measured plant biometric data and used root apices to analyze auxin (IAA), the expression of some Al-responsive genes that had been differentially expressed in a transcriptome analysis and anatomical profiles. We found up-regulated expression of multidrug and toxic compound exudation ( Cl-MATE channel), citrate synthase ( Cl-CS ) and pectin methylesterase inhibitor ( Cl-PMEI ) genes, but while Cl-PMEI expression was increased after 7 days, Cl-CS and Cl-MATE were up-regulated only after 60 days, suggesting that the timing of these events was ineffective against Al. These results could be associated with the Al-induced decrease in root growth and anatomical root damage. In addition, genes related to IAA cell transport were not differentially expressed in the transcriptome analysis. Therefore, high IAA and up-regulation of auxin-related small RNAs suggest Al-induced high IAA concentration rather than Al-induced disruption in IAA distribution in root cells of this species.
ISSN:0167-6903
1573-5087
DOI:10.1007/s10725-018-0458-5