NDLI: Enhanced Tonoplast H+-ATPase Activity and Superoxide Dismutase Activity in the Halophyte Suaeda salsa Containing High Level of Betacyanin

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Enhanced Tonoplast H+-ATPase Activity and Superoxide Dismutase Activity in the Halophyte Suaeda salsa Containing High Level of Betacyanin

Content Provider	Springer Nature Link
Author	Wang, Chang Quan Xu, Cheng Wei, Ji Guo Wang, Hong Bo Wang, Shao Hai
Copyright Year	2007
Abstract	In this study, high-betacyanin Suaeda salsa seedlings were developed and used to explore whether the betacyanin accumulation is related to salinity tolerance in S. salsa. After 8 days of culture, betacyanin content decreased markedly in both high-betacyanin S. salsa seedlings and the control under nonsalt stress, but the decreases were suppressed by NaCl treatments. Betacyanin content in high-betacyanin seedlings was much higher than that in the control throughout the salt treatments. Growth of S. salsa plants was significantly promoted by NaCl treatments, and the fresh weight of high-betacyanin seedlings was much higher than that of the control when grown in 400 mmol L−1 NaCl. Similar cell sap osmolarity and K+/Na+ ratios were observed in high-betacyanin seedlings and the control. No obvious differences in V-ATPase (tonoplast H+-ATPase) activity, leaf SOD (superoxide dismutase) activity, and total chloroplast SOD (including thylakoid-bound SOD and stroma SOD) activity were detected between high-betacyanin seedlings and the control under nonsalt stress conditions. However, V-ATPase hydrolytic activity increased dramatically in S. salsa seedlings when subjected to different levels of NaCl, and the increases in V-ATPase activity in high-betacyanin seedlings were much higher than that in the control. No clear pattern was observed for NaCl-dependent activity changes of P-ATPase (plasma membrane H+-ATPase) and V-PPase (tonoplast H+-pyrophosphatase). Similar changes were demonstrated in leaf SOD activity and chloroplast SOD activity under salt stress. Both leaf SOD activity and chloroplast SOD activity were markedly enhanced with the increase of NaCl or with time, especially thylakoid-bound SOD activity. Furthermore, the increases in chloroplast SOD activity and thylakoid-bound SOD activity were much higher in high-betacyanin seedlings than that in the control at different levels of NaCl treatment. The higher V-ATPase activity, chloroplastic SOD activity, and thylakoid-bound SOD activity demonstrated in high-betacyanin seedlings, but lower in the control, suggest that high-betacyanin S. salsa seedlings may have higher potential to be energized by the electrochemical gradient for ion uptake into the vacuole and to scavenge O 2 −• in situ produced in the chloroplasts, which may lead to higher salt tolerance than the control under salt stress. Thus, betacyanin may be involved in salt tolerance of S. salsa.
Starting Page	58
Ending Page	67
Page Count	10
File Format	PDF
ISSN	07217595
Journal	Journal of Plant Growth Regulation
Volume Number	27
Issue Number	1
e-ISSN	14358107
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-11-20
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Suaeda salsa Betacyanin V-ATPase Leaf total SOD activity Chloroplastic SOD activity Forestry Agriculture Cell Biology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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