Abstract:
:Two hydroxamic acids isolated from maize extracts, 2,4-dihydroxy-7-methoxy-1,4-(2H)-benzoxazin-3(4H)-one (DIMBOA) and the 2-O-beta-d-glucopyranoside of DIMBOA, inhibit photophosphorylation by spinach chloroplasts. Both cyclic and noncyclic photophosphorylations were inhibited to the same extent. The concentrations producing 50% inhibition for DIMBOA and its glucoside were about 1 and 4 millimolar, respectively. These compounds inhibit coupled electron transport but do not affect basal or uncoupled electron transport. Both acids inhibit the ATPase activities of membrane-bound coupling factor 1 (CF(1)) and of purified CF(1). On the basis of these results, it is concluded that DIMBOA and its glucoside act as energy transfer inhibitors of photophosphorylation.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Queirolo CB,Andreo CS,Vallejos RH,Niemeyer HM,Corcuera LJdoi
10.1104/pp.68.4.941subject
Has Abstractpub_date
1981-10-01 00:00:00pages
941-3issue
4eissn
0032-0889issn
1532-2548journal_volume
68pub_type
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