番茄中与抗根结线虫和根腐线虫感染相关的苯酚积累。
Phenol accumulation related to resistance in tomato to infection by root-knot and lesion nematodes.
作者信息
Hung C, Rohde R A
出版信息
J Nematol. 1973 Oct;5(4):253-8.
Host-parasite relationships of Meloidogyne incognita acrita and Pratylenchus penetrans were compared on three closely related cultivars of tomato: 'Nemared', resistant to root-knot nematodes; 'Hawaii 7153', moderately resistant; and 'B-5', susceptible. Root-knot nematode larvae induced typical galls on the roots of B-5; larvae that entered Nemared were walled-off by necrotic cells; both reactions occurred in Hawaii 7153. Lesion nematodes caused surface lesions which were initially similar on all cultivars. Five weeks after infection, they penetrated into the stele of the B-5 roots, whereas in Nemared and Hawaii 7153, injury was confined to the cortex. Chlorogenic acid was identified as the major phenofic compound in healthy tomato roots. Nemared contained the highest concentration of the acid and B-5 the lowest. Histochemical tests showed that chlorogenic acid was concentrated in the endodermis. The localized accumulation of chlorogenic acid and its oxidized products in host root cells infected by nematodes was concluded to be an important mechanism of resistance.
在三种亲缘关系密切的番茄品种上比较了南方根结线虫（Meloidogyne incognita acrita）和穿刺短体线虫（Pratylenchus penetrans）与寄主的关系：抗根结线虫的‘Nemared’；中度抗性的‘夏威夷7153’；以及感病的‘B - 5’。根结线虫幼虫在‘B - 5’的根部诱导形成典型的根瘤；侵入‘Nemared’的幼虫被坏死细胞包围；这两种反应在‘夏威夷7153’中都有发生。潜根线虫造成的表面损伤在所有品种上最初相似。感染五周后，它们侵入‘B - 5’根部的中柱，而在‘Nemared’和‘夏威夷7153’中损伤局限于皮层。绿原酸被鉴定为健康番茄根中的主要酚类化合物。‘Nemared’中该酸的浓度最高，‘B - 5’中最低。组织化学测试表明绿原酸集中在内皮层。线虫感染的寄主根细胞中绿原酸及其氧化产物的局部积累被认为是一种重要的抗性机制。
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