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Version 3.24
Publication Type J
Authors Krishnamurthy, P; Jyothi-Prakash, PA; Qin, L; He, J; Lin, QS; Loh, CS; Kumar, PP
Author Full Name Krishnamurthy, Pannaga; Jyothi-Prakash, Pavithra A.; Qin, Lin; He, Jie; Lin, Qingsong; Loh, Chiang-Shiong; Kumar, Prakash P.
Title Role of root hydrophobic barriers in salt exclusion of a mangrove plant Avicennia officinalis
Language English
Document Type Article
Author Keywords bypass flow; Casparian bands; mangroves; salt glands; salt secretion; suberin; xylem sap
Abstract Salt exclusion at the roots and salt secretion in the leaves were examined in a mangrove, Avicennia officinalis. The non-secretor mangrove Bruguiera cylindrica was used for comparative study of hydrophobic barrier formation in the roots. Bypass flow was reduced when seedlings were previously treated with high salt concentration. A biseriate exodermis was detected in the salt-treated roots, along with an enhanced deposition of hydrophobic barriers in the endodermis. These barriers reduced Na+ loading into the xylem, accounting for a 90-95% salt exclusion in A.officinalis. Prominent barriers were found in the roots of B.cylindrica even in the absence of salt treatment. A cytochromeP450 gene that may regulate suberin biosynthesis was up-regulated within hours of salt treatment in A.officinalis roots and leaves, corresponding with increased suberin deposition. X-ray microanalysis showed preferential deposition of Na+ and Cl- in the root cortex compared with the stele, suggesting that the endodermis is the primary site of salt exclusion. Enhanced salt secretion and increased suberin deposition surrounding the salt glands were seen in the leaves with salt treatment. Overall, these data show that the deposition of apoplastic barriers increases resistance to bypass flow leading to efficient salt exclusion at the roots in mangroves.
Author Address [Krishnamurthy, Pannaga; Jyothi-Prakash, Pavithra A.; Lin, Qingsong; Loh, Chiang-Shiong; Kumar, Prakash P.] Natl Univ Singapore, Dept Biol Sci, Singapore 117543, Singapore; [Krishnamurthy, Pannaga; Jyothi-Prakash, Pavithra A.; Loh, Chiang-Shiong] Natl Univ Singapore, NUS Environm Res Inst NERI, Singapore 117411, Singapore; [Qin, Lin; He, Jie] Nanyang Technol Univ, Nat Sci & Sci Educ Acad Grp, Natl Inst Educ, Singapore 637616, Singapore
Reprint Address Kumar, PP (reprint author), Natl Univ Singapore, Dept Biol Sci, Singapore 117543, Singapore.
E-mail Address dbskumar@nus.edu.sg
ResearcherID Number Kumar, Prakash/A-6236-2009; Lin, Qingsong/H-9794-2012
ORCID Number Kumar, Prakash/0000-0002-0963-1664; Lin, Qingsong/0000-0001-9117-8514
Funding Agency and Grant Number Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Programme; NRF-EWI-IRIS [2P 10004/81, R-706-000-010-272]; Singapore-Peking-Oxford Research Enterprise [COY-15-EWI-RCFSA/N197-1]
Funding Text This research was supported by the Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Programme and administered by the Environment & Water Industry Programme Office (EWI) of the PUB, Singapore, NRF-EWI-IRIS (2P 10004/81) (R-706-000-010-272). We acknowledge the Keppel Club and NParks Singapore for granting us permission to collect mangrove samples from Berlayer Creek and Sungei Buloh Wetland Reserves (Permit No. NP/RP1 2002-1). Financial support from the Singapore-Peking-Oxford Research Enterprise, COY-15-EWI-RCFSA/N197-1, to P.A.J. is gratefully acknowledged. The authors declare that they have no conflict of interests.
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Cited Reference Count 90
Times Cited 14
Total Times Cited Count (WoS, BCI, and CSCD) 14
Publisher City HOBOKEN
Publisher Address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
ISSN 0140-7791
29-Character Source Abbreviation PLANT CELL ENVIRON
ISO Source Abbreviation Plant Cell Environ.
Publication Date JUL
Year Published 2014
Volume 37
Issue 7
Beginning Page 1656
Ending Page 1671
Digital Object Identifier (DOI) 10.1111/pce.12272
Page Count 16
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number AJ3CX
Unique Article Identifier WOS:000337544200014
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