Journal ArticleDOI
Salinity-Induced Potassium Deficiency Causes Loss of Functional Photosystem II in Leaves of the Grey Mangrove, Avicennia marina, Through Depletion of the Atrazine-Binding Polypeptide
TLDR
The atrazine-binding polypeptide of photosystem II is identified as one site of sensitivity to salinity-induced K+ deficiency in Avicennia marina grown in low and high salinity nutrient solution.Abstract:
Photosynthetic properties were studied in relation to the ionic composition of leaves of Avicennia marina grown in low and high salinity (i.e. 50 and 500 mol m-3 NaCl) nutrient solution containing either 0.01 or 10 mol m-3 K+. Leaves accumulated high concentrations of NaCl, but changes in photosynthesis were associated with changes in leaf K+ concentrations. The effects occurred at two levels. (1) With decrease in leaf K+ from 379 to 167 mol m-3, a 21% decline in light and CO2 saturated rates of oxygen evolution per leaf area was consistent with a 24% decrease in chlorophyll content. (2) Leaves containing only 103 mol m-3 K+ showed drastic loss of light and CO2 saturated photosynthetic capacity (42%) and photochemical dysfunctioning under limiting light conditions as manifest in a 38% decrease in quantum yield. Thylakoids isolated from these low K+ leaves showed no decrease in per chlorophyll concen- trations of photosystem I, cytochrome f/b complex and ATPase, but had 37% fewer atrazine-binding sites (corresponding to photosystem II reaction centres) than those from leaves with higher K+ concentrations. The decline in atrazine-binding sites in isolated thylakoids was sufficient to account for the loss of quantum yield in intact leaves. These results identify the atrazine-binding polypeptide of photosystem II as one site of sensitivity to salinity-induced K+ deficiency.read more
Citations
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Journal ArticleDOI
Salt tolerance and salinity effects on plants: a review.
TL;DR: The ability of plants to tolerate salt is determined by multiple biochemical pathways that facilitate retention and/or acquisition of water, protect chloroplast functions, and maintain ion homeostasis as mentioned in this paper.
Journal ArticleDOI
Environmental drivers in mangrove establishment and early development: A review
Ken W. Krauss,Catherine E. Lovelock,Karen L. McKee,Laura López-Hoffman,Sharon M.L. Ewe,Wayne P. Sousa +5 more
TL;DR: In this paper, a review of the mangrove literature focusing on eco-physiological and growth constraints to the establishment and early development of seedlings in the intertidal zone is presented.
Journal ArticleDOI
Effects of salt stress on basic processes of photosynthesis
P. Sudhir,S.D.S. Murthy +1 more
TL;DR: Both multiple inhibitory effects of salt stress on photosynthesis and possible salt stress tolerance mechanisms in cyanobacteria and plants are reviewed.
Journal ArticleDOI
Ecophysiology of mangroves
TL;DR: In this paper, a functional understanding of the physical and biological processes underlying mangrove ecosystem dynamics is presented. But this process is not suitable for the management of mangroves.
Journal ArticleDOI
Effects of Nutrient Enrichment on Growth and Herbivory of Dwarf Red Mangrove (Rhizophora Mangle)
TL;DR: It is concluded that phosphorus availability is a major factor limiting red mangrove growth at my study site in the interior of Twin Cays and that sclerophylly in oligotrophic ecosystems may be an adaptive mechanism related to nutrient conservation, and that it is associated with redMangrove survival in phosphorus-deficient soil rather than an adaptation to herbivory.
References
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Journal ArticleDOI
Copper enzymes in isolated chloroplasts. polyphenoloxidase in beta vulgaris
TL;DR: Evidence that a copper enzyme, polyphenoloxidase (otherwise known as tyrosinase or catecholase), is localized in the chloroplasts of spinach beet (chard), Beta vu?garis is presented.
Journal ArticleDOI
Membrane protein damage and repair: Selective loss of a quinone-protein function in chloroplast membranes.
TL;DR: It is suggested that quinone anions, which may interact with molecular oxygen to produce an oxygen radical, selectively damage the apoprotein of the secondary acceptor of PSII, thus rendering it inactive and thereby blocking photosynthetic electron flow under conditions of high photon flux densities.
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Regulation of protein metabolism: Coupling of photosynthetic electron transport to in vivo degradation of the rapidly metabolized 32-kilodalton protein of the chloroplast membranes
TL;DR: In Spirodela oligorrhiza, mature chloroplasts copiously synthesize and degrade a 32-kilodalton membrane protein, with degradation coupled to electron transport rather than phosphorylation.
Journal ArticleDOI
Salt Tolerance in Plants
TL;DR: The physiological Basis of Salt Tolerance of Plants, as Affected by Various Types of Salinity, is described.
Journal ArticleDOI
Relationship between inhibitor binding by chloroplasts and inhibition of photosynthetic electron transport.
W. Tischer,H. Strotmann +1 more
TL;DR: The results suggest that triazines, triazinones, pyridazinone derivatives, biscarbamates and phenylureas interfere with the same electron carrier of the photosynthetic electron transport chain, according to the same molecular mechanism.