Abstract：
:Calcium transport by purified endomembrane vesicles from roots of Pisum sativum L. was studied. Two types of ATP-dependent transport were demonstrated, protonophore-sensitive calcium/proton antiport and protonophore-insensitive transport. The former was predominantly located in the tonoplast, while the latter was associated with the plasma membrane and Golgi apparatus. Calcium uptake by membranes of low buoyant density (tonoplast) was inhibited by nitrate and was not sensitive to sodium orthovanadate while that by membranes of high buoyant density (plasma membrane, Golgi apparatus) was inhibited by sodium orthovanadate and insensitive to nitrate. Endoplasmic reticulum also took up calcium in the presence of ATP; however, because of its imperfect separation from the tonoplast, the nature of the calcium-transport system present could not be fully characterised. None of the calcium transporters were stimulated by calmodulin or inhibited by calmodulin inhibitors.
journal_name
Plantajournal_title
Plantaauthors
Butcher RD,Evans DEdoi
10.1007/BF00394597subject
Has Abstractpub_date
1987-10-01 00:00:00pages
273-9issue
2eissn
0032-0935issn
1432-2048journal_volume
172pub_type
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