[免疫抑制剂在马铃薯-病原菌疫病发病机制中的作用]

[Immunosuppressors in pathogenesis of potato-pathogen blight].

作者信息

Ozeretskovskaia O L, Vasiukova N I, Perekhod E A, Chalenko G I, Il'inskaia L I, Gerasimova N G

机构信息

Bach Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 117071 Russia.

出版信息

Prikl Biokhim Mikrobiol. 2001 Sep-Oct;37(5):593-600.

PMID:11605474

Abstract

The properties and effects of two plant resistance suppressors (1,3-beta-1,6-beta-glucan and a pentasaccharide of xyloglucan origin) involved in the pathosystem of potato (Solanum tuberosum) and the causal agent of blight (Phytophthora infestans (Mont) de Bary) were compared. The microbial 1,3-beta-1,6-beta-glucan suppressed the defense response over a narrow concentration range (10(-2) M), whereas the plant pentasaccharide had a broad range of effective concentrations (10(-12) to 10(-6) M). In the pathosystem of potato-causal agent of late blight, the beta-glucan caused a local and race-specific suppressor effect on the plant host defense response. In contrast, the pentasaccharide caused both local and systemic suppression of potato resistance, and the presence of terminal fucosyl residue in the xyloglucan oligosaccharine played a decisive role in its effect. The recognition of both suppressors by potato cell membrane sites is discussed.

摘要

比较了参与马铃薯（Solanum tuberosum）与晚疫病病原菌（致病疫霉（Mont）de Bary）病理系统的两种植物抗性抑制因子（1,3-β-1,6-β-葡聚糖和木葡聚糖来源的五糖）的特性和作用效果。微生物1,3-β-1,6-β-葡聚糖在较窄的浓度范围（10⁻² M）内抑制防御反应，而植物五糖具有广泛的有效浓度范围（10⁻¹²至10⁻⁶ M）。在马铃薯-晚疫病病原菌病理系统中，β-葡聚糖对植物宿主防御反应产生局部和小种特异性的抑制作用。相比之下，五糖对马铃薯抗性产生局部和系统性抑制，木葡聚糖寡糖中末端岩藻糖基残基的存在对其作用起决定性作用。文中讨论了马铃薯细胞膜位点对这两种抑制因子的识别。