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The mechanism of resistance to paraquat is strongly temperature dependent in resistant Hordeum leporinum Link and H. glaucum Steud. by Edison Purba; Christopher Preston; Stephen B. Powles is a Agricultural and Biological Sciences article available to read on EtoBox.

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Paraquat-resistant biotypes of the closelyrelated weed species Hordeum leporinum Link and H. 91aucum Steud. are highly resistant to paraquat when grown during the normal winter growing season. However, when grown and treated with paraquat in summer, these biotypes are markedly less resistant to paraquat. This reduced resistance to paraquat in summer is primarily a result of increased temperature following herbicide treatment. The mechanism governing this decrease in resistance at high temperature was examined in H. leporinum. No differences were observed between susceptible and resistant biotypes in the interaction of paraquat with isolated thylakoids when assayed at 15, 25, or 35~ About 98 and 65% of applied paraquat was absorbed through the leaf cuticle of both biotypes at 15 and 30 ~ respectively. Following application to leaves, more herbicide was translocated in a basipetal direction in the susceptible biotype compared to the resistant biotype at 15 ~ However, at 30 ~ more paraquat was translocated in a basipetal direction in the resistant biotype. Photosynthetic activity of young leaf tissue from within the leaf sheath which had not been directly exposed to paraquat was measu

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Author

Edison Purba; Christopher Preston; Stephen B. Powles

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1995

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)