Ultrastructure of compatible and incompatible interactions of soybean roots infected with the plant pathogenic oomycete Phytophthora sojae

大豆疫霉 生物 吸器 卵菌 毒力 游动孢子 超微结构 植物 疫霉菌 附着胞 病菌 过敏反应 菌丝 寄主(生物学) 发芽 微生物学 植物抗病性 基因 孢子 遗传学
作者
K. Enkerli,Charles W. Mims,Michael G. Hahn
出处
期刊:Canadian journal of botany [Canadian Science Publishing]
卷期号:75 (9): 1493-1508 被引量:122
标识
DOI:10.1139/b97-864
摘要

Compatible and incompatible interactions of two soybean isolines containing either Rps1a or Rps1b resistance genes with races 2 and 8 of Phytophthora sojae were examined by light and electron microscopy. Phytophthora sojae race 2 is virulent on Rps1b plants and avirulent on Rps1a plants. Race 8 shows the reverse reaction; it is avirulent on Rps1b plants, but virulent on Rps1a plants. All combinations of races and cultivars were examined at times ranging from 30 min to 20 h postinoculation. Zoospore encystment, germination, and infection occurred within 30 min in all interactions. No evidence of appressorium formation was found. Wall appositions in epidermal cells adjacent to hyphae were very frequent by 30 min postinoculation. Differences between compatible and incompatible interactions became evident as early as 4 h postinoculation. The major difference appeared to relate to timing of host responses, which lead to two different types of relationships. In compatible interactions, P. sojae exhibited a short biotrophic phase with the establishment of many haustoria without triggering visible plant responses in cortical cells until approximately 10 h postinoculation. By 15 h postinoculation, almost the entire root was necrotic, wall appositions were abundant, and vascular tissue was colonized. The incompatible interaction was characterized by a nearly complete absence of haustoria, rapid host cell necrosis, and formation of many wall appositions by 4 h postinoculation. The pathogen rarely penetrated beyond the endodermis of the resistant host and colonization of vascular tissue was rare. Overall there were clear ultrastructural differences between compatible and incompatible interactions of soybean with P. sojae. These data support a strong correlation of resistance with host cell death, formation of wall appositions, and absence of root stele colonization. Key words: Phytophthora sojae, Glycine max, host–pathogen interaction, ultrastructure.

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