Transport of Salicylic Acid in Tobacco Necrosis Virus-Infected Cucumber Plants.
AUTOR(ES)
Molders, W.
RESUMO
The transport of salicylic acid (SA) was studied in cucumber (Cucumis sativus L.) using 14C-labeled benzoic acid that was injected in the cotyledons at the time of inoculation. Primary inoculation with tobacco necrosis virus (TNV) on the cotyledons led to an induction of systemic resistance of the first primary leaf above the cotyledon against Colletotrichum lagenarium as early as 3 d after inoculation. [14C]SA was detected in the phloem or in the first leaf 2 d after TNV inoculation, whereas [14C]benzoic acid was not detected in the phloem during the first 3 d after TNV inoculation of the cotyledons, indicating phloem transport of [14C]SA from cotyledon. In leaf 1, the specific activity of [14C]SA decreased between 1.7 and 8.6 times compared with the cotyledons, indicating that, in addition to transport, leaf 1 also produced more SA. The amount of SA transported after TNV infection of the cotyledon was 9 to 160 times higher than in uninfected control plants. Thus, SA can be transported to leaf 1 before the development of systemic acquired resistance, and SA accumulation in leaf 1 results both from transport from the cotyledon and from synthesis in leaf 1.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=158003Documentos Relacionados
- Local and Systemic Biosynthesis of Salicylic Acid in Infected Cucumber Plants.
- Salicylic acid is a systemic signal and an inducer of pathogenesis-related proteins in virus-infected tobacco.
- The ORF1 Products of Tombusviruses Play a Crucial Role in Lethal Necrosis of Virus-Infected Plants
- RNA-directed RNA polymerases from healthy and from virus-infected cucumber.
- Examination of potato virus X proteins synthesized in infected tobacco plants.
