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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Control ofPhytophthora melonisdamping-off treated with 24-epibrassinolide and a histological study of cucumber hypocotyl
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Control ofPhytophthora melonisdamping-off treated with 24-epibrassinolide and a histological study of cucumber hypocotyl

机译：用24倍纤氯化物治疗血小阴素晶体滴水的对照及黄瓜胚囊的组织学研究

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The oomycetePhytophthora meloniscauses a severe disease in cucumber plants in Asia. In this study, the diameter of cucumber hypocotyl in the resistant variety 'Shantou qing gua' was significantly larger than that of the susceptible variety 'Zhongnong No. 20'. The significantly lower incidence of disease and less invasive hyphae on the epidermis and transverse section of hypocotyls in P plants of the resistant variety than those in susceptible cultivars were also observed. Brassinosteroids are a class of phytohormones that affect plant growth and development and are involved in regulating plant resistance to a variety of biotic and abiotic stresses. 24-Epibrassinolide root drenching significantly enhanced the thickening of cucumber hypocotyl. Thick hypocotyls showed strong resistance toP. melonis, indicating that it significantly reduced the incidence of disease and retarded the hyphae extension for both resistant and susceptible cucumbers. 24-Epibrassinolide pretreatment had no significant effect on the elongation of cucumber hypocotyl. Further histological observation showed that under the condition of infection withP. melonis, exogenous 24-epibrassinolide could induce lignin deposition in external phloem and xylem vessel cell wall of the cucumber hypocotyl vascular bundle. There is also an accumulation of callose in the external phloem sieve plate, which activates the resistance responses in cell walls. It is worth mentioning that in both inoculated and uninoculated conditions, exogenous 24-epibrassinolide enhanced lignin formation in external phloem and xylem vessel cell wall of the vascular bundle. This increased the content of lignin in hypocotyl as well as the number of vascular bundles in the hypocotyl base. The above results show that 24-epibrassinolide constitutively regulates the thickening of cucumber hypocotyl and the development of vascular bundle, hence preventing phytophthora infection and inducing plant resistance to disease.
机译：Oomycetephytophthora Meloniscauses在亚洲黄瓜植物中的严重疾病。在这项研究中，耐药品种“汕头清关岛”中黄瓜缺口的直径显着大于易感品种“中龙”第20号“。还观察到抗性多样性的P植物表皮和横截面上显着降低的疾病和较少的侵袭性菌丝比抗易感品种的抗损伤的横截面。芸苔类化合物是一类影响植物生长和发育的植物激素，并参与调节植物抵抗各种生物和非生物胁迫。 24-呕血素醇根浸透显着增强了黄瓜缺口的增厚。厚的下胚轴显示出强抗性顶部。甜瓜，表明它显着降低了疾病的发病率，并延迟了抗腐蚀性和易感黄瓜的菌丝延伸。 24-呕血素醇醚预处理对黄瓜缺口的伸长无显着影响。进一步的组织学观察表明，在感染的条件下。甜瓜，外源24倍刺激蛋白可以在外部韧皮肌和木瓜血管围筒中诱导木质素沉积。外部Phloem筛板中还存在胼uem，其激活细胞壁中的电阻响应。值得一提的是，在接种和未征收的条件下，外源24倍刺激素增强了血管束的外部韧皮肌和木质血管细胞壁中的木质素形成。这增加了幼杆基的木质素的含量以及缺杆基碱中的血管束的数量。上述结果表明，24倍氧化物醇素组成型调节黄瓜缺杆子的增稠以及血管束的发育，因此预防植物培序感染和诱导植物对疾病的抗性。

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