Effects of Hydroxamic Acids Isolated from Gramineae on Adenosine 5'-triphosphate Synthesis in Chloroplasts.

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 Physiol

journal_title

Plant physiology

authors

Queirolo CB,Andreo CS,Vallejos RH,Niemeyer HM,Corcuera LJ

doi

10.1104/pp.68.4.941

subject

Has Abstract

pub_date

1981-10-01 00:00:00

pages

941-3

issue

4

eissn

0032-0889

issn

1532-2548

journal_volume

68

pub_type

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