Multiple hormones act sequentially to mediate a susceptible tomato pathogen defense response

被引:114
作者
O'Donnell, PJ
Schmelz, E
Block, A
Miersch, O
Wasternack, C
Jones, JB
Klee, HJ [1 ]
机构
[1] Univ Florida, Dept Hort Sci, Gainesville, FL 32611 USA
[2] Univ Florida, Dept Plant Pathol, Gainesville, FL 32611 USA
[3] USDA ARS, Ctr Med Agr & Vet Entomol, Gainesville, FL 32608 USA
[4] Inst Plant Biochem, D-06018 Halle, Germany
关键词
D O I
10.1104/pp.103.030379
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Phytohormones regulate plant responses to a wide range of biotic and abiotic stresses. How a limited number of hormones differentially mediate individual stress responses is not understood. We have used one such response, the compatible interaction of tomato (Lycopersicon esculentum) and Xanthomonas campestris pv vesicatoria (Xcv), to examine the interactions of jasmonic acid (JA), ethylene, and salicylic acid (SA). The role of JA was assessed using an antisense allene oxide cyclase transgenic line and the def1 mutant to suppress Xcv-induced biosynthesis of jasmonates. Xcv growth was limited in these lines as was subsequent disease symptom development. No increase in JA was detected before the onset of terminal necrosis. The lack of a detectable increase in JA may indicate that an oxylipin other than JA regulates basal resistance and symptom proliferation. Alternatively, there may be an increase in sensitivity to JA or related compounds following infection. Hormone measurements showed that the oxylipin signal must precede subsequent increases in ethylene and SA accumulation. Tomato thus actively regulates the Xcv-induced disease response via the sequential action of at least three hormones, promoting expansive cell death of its own tissue. This sequential action of jasmonate, ethylene, and SA in disease symptom development is different from the hormone interactions observed in many other plant-pathogen interactions.
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收藏
页码:1181 / 1189
页数:9
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