Effect of cytokinins on tobacco mosaic virus production in local-lesion and systemic hosts
1969; Elsevier BV; Volume: 38; Issue: 1 Linguagem: Inglês
10.1016/0042-6822(69)90124-x
ISSN1096-0341
AutoresG. E. Milo, B. I. Sahai Srivastava,
Tópico(s)Plant-Microbe Interactions and Immunity
ResumoWhen Nicotiana glutinosa leaves, immediately after inoculation with tobacco mosaic virus (TMV) were floated on 0.1–20 mg/l of kinetin (K), kinetin riboside (KR), N6-benzyladenine (BAD), N6-benzylaminopurine (BAP), or N6-isopentenyladenosine (IPA), lesion formation was inhibited but virus production was stimulated. In Phaseolus vulgaris L. var. Pinto (another local-lesion host), however, K, KR, and IPA severely, and BAP or BAD to a lesser extent, inhibited lesion formation and virus production. In addition, BAD caused a substantial increase in lesion size whereas IPA and BAP reduced the lesion size. When TMV-inoculated leaves of Nicotiana tabacum L. var. Wisconsin 38 and of Nicotiana rustica (two systemic hosts) were treated with the cytokinins, virus production was stimulated with all cytokinins except KR, which inhibited virus production in N. rustica. No consistent effect of cytokinins on chlorophyll retention in healthy or virus-infected leaves from the plants was noted. These results show that the effect of cytokinins on viruses appears to be very specific and may depend on particular host, virus system, cytokinin and its concentration, and other factors.
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