PHENYLPROPANOID ACCUMULATION AND SYMPTOM EXPRESSION IN THE LETHAL LEAF-SPOT MUTANT OF MAIZE
PHENYLPROPANOID ACCUMULATION AND SYMPTOM EXPRESSION IN THE LETHAL LEAF-SPOT MUTANT OF MAIZE
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DOI：
10.1016/s0885-5765(05)80050-5
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发表时间：
1994-05-01
影响因子：
2.7
通讯作者：
DUNKLE, LD
中科院分区：
文献类型：
--
作者：
OBANNI, M;HIPSKIND, J;DUNKLE, LD
玉米（Zea mays L.）致死性叶斑病（LLS）突变体的症状表达，研究了由纯合隐性Ils基因调节的疾病病变模拟物，以评估病变发展的速率，并比较在受影响的LLS叶组织中积累的酚类化合物与在用真菌异柄旋孢菌接种的野生型姊妹植物中积累的酚类化合物。在LLS突变体和C.异株虫一个p-香豆酸酯积累在LLS病变在其发展过程中，但未检测到未接种的LLS控制或在叶片接种真菌。与真菌病原体引起的典型病变不同，也与玉米其他疾病模拟物中的病变不同，LLS植物中的病变也没有被界定并达到有限的大小。LLS植物中的病变以增加的速率扩大，直到叶片上没有活组织。因此，LLS病变扩大，而不管与真菌诱导的病变中的病变划界相关的苯丙素衍生物的积累。这些数据表明，病变终止信号或因素提出限制病变扩大疾病模拟LLS植物是不存在的。
Symptom expression in the lethal leaf spot (LLS) mutant of maize (Zea mays L.), a disease lesion mimic conditioned by the homozygous recessive Ils gene, was investigated to assess the rate of lesion development and to compare the phenolic compounds that accumulate in affected LLS leaf tissue with those that accumulate in wild-type sib-plants inoculated with the fungus Cochliobolus heterostrophus. Several esters of phenylpropanoids, including caffeic acid and ferulic acid, accumulated during lesion development in both the LLS mutant and in lesions incited by C. heterostrophus. A p-coumaric acid ester accumulated in the LLS lesions during their development but was not detected in uninoculated LLS controls or in leaves inoculated with the fungus. Unlike typical lesions incited by fungal pathogens and unlike the lesions in other disease mimics of maize, the lesions in LLS plants did nor become delimited and attain a finite size. Lesions in LLS plants expanded at increasing rates until no living tissue remained on the leaf blade. Thus, LLS lesions expanded regardless of the accumulation of phenylpropanoid derivatives that are associated with lesion delimitation in fungal-induced lesions. The data suggest that lesion termination signals or factors proposed to restrict lesion expansion in disease mimics are absent from LLS plants.