Burns, Earl R.; Buchanan, Gale A.; Carter, Mason C. published the article 《New site for herbicidal action pinpointed》. Keywords: herbicide plant mechanism; amitrole wheat carotene production; chlorophyll photodestruction pyriclor.They researched the compound: 2,3,5-Trichloropyridin-4-ol( cas:1970-40-7 ).Application of 1970-40-7. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:1970-40-7) here.
In wheat, the herbicides amitrole (3-amino-s-triazole)(I) [61-82-5], dichlormate (3,4-dichlorobenzyl methylcarbamate) [1966-58-1], and pyriclor (2,3,5-trichloro-4-pyridinol) [1970-40-7] inhibited β-carotene (II) [7235-40-7] synthesis, not chlorophyll [1406-65-1] synthesis. The pronounced chlorosis which followed treatment with these herbicides resulted from the photodestruction of chlorophyll in plants lacking II.
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Reference:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem