Abstract:
:Verapamil and nifedipine, known as calcium channel blockers, inhibited the phytochrome-mediated movements induced on Cassia fasciculata leaflets by a light-off signal, whereas they had no effect on the ;blue' pigment-mediated movements induced by a light-on signal. LaCl(3) inhibited both types of reactions, but the inhibition of light-induced opening needed a 10 times higher concentration than that of dark-induced closure. Bay K 8644, an activator of calcium channels, increased the rate of dark-induced closure, whereas it had no effect on the light-induced opening. These data suggest that calcium ions are not mobilized in the same way in the two types of movements: possibly from external stores in the phytochrome-mediated reaction and from internal stores in the ;blue' pigment-mediated reaction.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Roblin G,Fleurat-Lessard P,Bonmort Jdoi
10.1104/pp.90.2.697subject
Has Abstractpub_date
1989-06-01 00:00:00pages
697-701issue
2eissn
0032-0889issn
1532-2548journal_volume
90pub_type
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