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Ca^(2+)-Calmodulin is Involved in Betacyanin Accumulation Induced by Dark in C_3 Halophyte Suaeda salsa 被引量:3

Ca^(2+)-Calmodulin is Involved in Betacyanin Accumulation Induced by Dark in C_3 Halophyte Suaeda salsa
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摘要 The C3 halophyte Suaeda salsa was used to investigate the roles of Ca^2+, Ca^2+ channels, and calmodulin (CAM) in betacyanin metabolism. Seeds of S. salsa were cultured in both the dark and light for 3 days. The fresh weight and betacyanin content were much higher in S. salsa seedlings formed in the dark than in seedlings formed in the light. The addition of Ca^2+ to the half-strength MS nutrient solution promoted betacyanin accumulation in the dark, whereas Ca^2+ depletion by EGTA suppressed the dark-induced betacyanin accumulation in shoots of S. salsa. The Ca^2+ channel blocker LaCl3 also inhibited dark-induced betacyanin accumulation. The highest activity of CaM and the maximum betacyanin content decreased by 51% and 45%, respectively, in shoots of S. salsa seedlings treated with the potent CaM antagonist chlorpromazine in the dark. Furthermore, the other CaM antagonist N-(6-aminohexyl)-5-chloro-l-naphthalenesulfonamide (W-7) also inhibited the activity of CaM and dark-dependent betacyanin accumulation, whereas its less active structural analog N-(6-aminohexyl)- 1-naphthalenesulfonamide (W-5) had little effect on the responses to dark of S. salsa seedlings. These results suggest that Ca^2+, Ca^2+-regulated ion channels, and CaM play an important role in dark-induced betacyanin accumulation in the shoots of the C3 halophyte S. salsa. The C3 halophyte Suaeda salsa was used to investigate the roles of Ca^2+, Ca^2+ channels, and calmodulin (CAM) in betacyanin metabolism. Seeds of S. salsa were cultured in both the dark and light for 3 days. The fresh weight and betacyanin content were much higher in S. salsa seedlings formed in the dark than in seedlings formed in the light. The addition of Ca^2+ to the half-strength MS nutrient solution promoted betacyanin accumulation in the dark, whereas Ca^2+ depletion by EGTA suppressed the dark-induced betacyanin accumulation in shoots of S. salsa. The Ca^2+ channel blocker LaCl3 also inhibited dark-induced betacyanin accumulation. The highest activity of CaM and the maximum betacyanin content decreased by 51% and 45%, respectively, in shoots of S. salsa seedlings treated with the potent CaM antagonist chlorpromazine in the dark. Furthermore, the other CaM antagonist N-(6-aminohexyl)-5-chloro-l-naphthalenesulfonamide (W-7) also inhibited the activity of CaM and dark-dependent betacyanin accumulation, whereas its less active structural analog N-(6-aminohexyl)- 1-naphthalenesulfonamide (W-5) had little effect on the responses to dark of S. salsa seedlings. These results suggest that Ca^2+, Ca^2+-regulated ion channels, and CaM play an important role in dark-induced betacyanin accumulation in the shoots of the C3 halophyte S. salsa.
出处 《Journal of Integrative Plant Biology》 SCIE CAS CSCD 2007年第9期1378-1385,共8页 植物学报(英文版)
基金 Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP,20050445003) Shandong Natural Science Foundation(Z2004D03) Science Foundation of Shandong University of Technology.
关键词 BETACYANIN Ca^2+ CALMODULIN DARKNESS Suaeda salsa. betacyanin Ca^2+ calmodulin darkness Suaeda salsa.
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