Abstract:
:Johnsongrass (Sorghum halepense (L.) Pers.) is sensitive to methanearsonate, foliar application resulting in a topkill. Investigation of the pattern of photosynthesis by radioautography revealed an accumulation of malate in methanearsonate-treated leaves. Accumulation of malate was attributed to an inhibition of NADP(+)-malic enzyme which was found to be sensitive to sulfhydryl group reagents including arsenosomethane, CH(3)AsO. Methanearsonate was found to act as an oxidant in the Hill reaction using spinach chloroplasts, the photoproduct being a sulfhydryl group reagent.These results suggest that methanearsonate inhibits CO(2) release from malate in bundle sheath cells, depriving the plant of its source of carbon for sucrose production. The mechanism of inhibition of enzymes sensitive to sulfhydryl group reagents by arsenosomethane is addressed.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Knowles FC,Benson AAdoi
10.1104/pp.71.2.235subject
Has Abstractpub_date
1983-02-01 00:00:00pages
235-40issue
2eissn
0032-0889issn
1532-2548journal_volume
71pub_type
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