eHALOPH - Halophytes Database

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
Source	PLANT CELL AND ENVIRONMENT
Language	English
Document Type	Article
Author Keywords	bypass flow; Casparian bands; mangroves; salt glands; salt secretion; suberin; xylem sap
Keywords Plus	ORYZA-SATIVA L.; RADIAL OXYGEN LOSS; REDUCES SODIUM UPTAKE; SALINITY TOLERANCE; BYPASS-FLOW; CASPARIAN BANDS; MULTISERIATE EXODERMIS; SYMPLASTIC PATHWAYS; APOPLASTIC BARRIERS; SUBERIN LAMELLAE
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	WILEY-BLACKWELL
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
Plants associated with this reference	Avicennia officinalis Bruguiera cylindrica