Host: The Japanese Society of Plant Physiologists
Pages 0084
Three SIP members of A. thaliana are localized in the ER in a cell-specific manner (FEBS Lett. 2005). SIP1;1 and SIP2;1, but not SIP1;2, have water channel activity. Actual substrates and physiological role are unknown. Here we examined effect of various stimuli on expression of SIP genes. Database shows that SIP1;2 expression was enhanced by silver nitrate, an inhibitor of ethylene action. We also considered ethylene receptor in the ER.
Silver nitrate and silver thiosulfate enhanced SIP1;2 markedly. However the gene was not affected by an ethylene precursor ACC. There was no change in SIP mRNA levels in ethylene insensitive or ethylene-over producing mutant lines. SIPs may not be directly associated to ethylene action. SIP1;2 expression was reduced by the treatment with tunicamycin. Other reagents including paraquat, copper and zinc had no effect. SIP genes may be constitutively expressed and response to a few specific stimuli such as silver ion.
