Abstract:
:Respiratory control ratios between 2.0 and 9.0 were obtained by comparison of the respiratory rates of cabbage mitochondria in the presence and in the absence of individual components of the system used to provide ADP and by comparing the rates before and after exhaustion of added ADP. These results indicate that respiration in cabbage mitochondria is controlled by the availability of ADP, which serves as the phosphate acceptor. Pentachlorophenol (PCP), 2,4-dinitrophenol (DNP), gramicidin and oleic acid inhibited phosphorylation to a greater extent than respiration in the cabbage mitochondria, but these reagents did not stimulate respiration in the absence of a phosphate acceptor. Respiration was stimulated by DNP only in the presence of added ATP.2,4-Dinitrophenol, pentachlorophenol, dicumarol and gramicidin did not stimulate ATPase activity either in the presence or absence of added Mg(2+). Oleic acid stimulated ATPase activity in the presence of added Mg(2+), but did not stimulate respiration even in the presence of added ATP. The ATP-(32)Pi exchange rate was increased many fold in the presence of added Mg(2+). Oleic acid and 2,4-dinitrophenol inhibited the exchange almost completely.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Lotlikar PD,Remmert LFdoi
10.1104/pp.43.3.327subject
Has Abstractpub_date
1968-03-01 00:00:00pages
327-32issue
3eissn
0032-0889issn
1532-2548journal_volume
43pub_type
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