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Authors Shoukat, E; Ahmed, MZ; Abideen, Z; Azeem, M; Ibrahim, M; Gul, B; Khan, MA
Author Full Name Shoukat, Erum; Ahmed, Muhammad Zaheer; Abideen, Zainul; Azeem, Muhammad; Ibrahim, Muhammad; Gul, Bilquees; Khan, M. Ajmal
Title Short and long term salinity induced differences in growth and tissue specific ion regulation of Phragmites karka
Source FLORA
Language English
Document Type Article
Author Keywords Ion toxicity; Leaf senescence; Nutrient selectivity; Marshy grass; Osmotic stress
Keywords Plus PHYSIOLOGICAL-RESPONSES; SALT STRESS; WATER RELATIONS; TOLERANCE; TRANSPORT; CHLORIDE; PLANTS; NA+; CL; ACCUMULATION
Abstract Plant responses to salinity vary with concentration and duration of salt exposure. This study was designed to examine Phragmites karka responses under short (0-7 days) and long term (15-30 days) salinity treatments (0 mM NaCl - non saline, 100 mM NaCl - moderate and 300 mM NaCl - high) at growth and tissue specific ion regulation level. Plant growth was unchanged in short term exposure of moderate salinity, while shoot biomass decreased after long term exposure. However, growth rate decreased from short term exposure to high salinity with severe growth reduction (80 % of control) after prolonged exposure due to enhanced leaf senescence, associated with elevated hydrogen peroxide and malondialdehyde concentration. Accumulation of Na+ and Cl- was higher in root than leaf throughout the experiment. Sodium was unchanged in juvenile leaves under salinity, while increased Na+ in adult leaves correlated with leaf senescence. Chloride increased in all plant tissues from short term salt treatment, and contributed as major osmoticum under salinity. Nutrient selective absorption increased earlier (3rd day) than selective transport under salinity that helped to maintain nutrient homeostasis. In conclusion, P. karka can resist moderate salinity for long periods, by reduction of growth, Na+ sequestration in root and adult leaves, uses Cl- as major osmoticum, and increases selective nutrient transport. Moreover, the plant withstands short term exposure to high salinity without any damage symptoms whereas long term exposure to 300 mM NaCl is toxic for the plant, because of insufficient Na+ exclusion, premature leaf senescence, and enhanced reactive oxygen species production.
Author Address [Shoukat, Erum; Ahmed, Muhammad Zaheer; Abideen, Zainul; Gul, Bilquees; Khan, M. Ajmal] Univ Karachi, Dr Muhammad Ajmal Khan Inst Sustainable Halophyte, Karachi 75270, Pakistan; [Azeem, Muhammad] Univ Karachi, Dept Bot, Karachi, Pakistan; [Ibrahim, Muhammad] Univ Karachi, Dept Chem, Karachi, Pakistan
Reprint Address Ahmed, MZ (corresponding author), Univ Karachi, Dr Muhammad Ajmal Khan Inst Sustainable Halophyte, Karachi 75270, Pakistan.
E-mail Address mzahmed@uok.edu.pk
ResearcherID Number Abideen, Zainul/O-4760-2019
Funding Agency and Grant Number DFS grant [2017-18]; Dean faculty of Science,University of Karachi
Funding Text This research was supported by DFS grant 2017-18 provided by Dean faculty of Science,University of Karachi.
Times Cited 2
Total Times Cited Count (WoS, BCI, and CSCD) 2
Publisher ELSEVIER GMBH
Publisher City MUNICH
Publisher Address HACKERBRUCKE 6, 80335 MUNICH, GERMANY
ISSN 0367-2530
29-Character Source Abbreviation FLORA
ISO Source Abbreviation Flora
Publication Date FEB
Year Published 2020
Volume 263
Article Number 151550
Digital Object Identifier (DOI) 10.1016/j.flora.2020.151550
Page Count 10
Web of Science Category Plant Sciences; Ecology
Subject Category Plant Sciences; Environmental Sciences & Ecology
Document Delivery Number KN5JU
Unique Article Identifier WOS:000514874000016
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