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首页> 外文期刊>Plant Disease >Characteristics of Resistance to Phytophthora Root and Crown Rot in Cucurbita pepo
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Characteristics of Resistance to Phytophthora Root and Crown Rot in Cucurbita pepo

机译：甘草骨质植物抗植物抗植物的特征及冠腐

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摘要

Root and crown rot incited by Phytophthora capsici causes considerable annual losses in squash-producing regions in the United States. 'Spineless Perfection' zucchini and 'Cougar' straightneck squash {Cucurbita pepo L.), partially resistant and susceptible to root and crown rot, respectively, were investigated for differences in root and crown physical factors and the histology of crown infection by P. capsici. The pH and titratable acidity of healthy root and crown tissue from tissue extracts were not significantly different between cultivars (P = 0.05). Crude fiber content (%) of blended and oven-dried root and crown tissue from healthy plants was similar between cultivars. However, dry matter (%) was highest for Cougar (P = 0.05). Colonies of P.capsici grown from mycelial plugs in root exudates collected from each cultivar were similar in diameter. Whole mounts and histological sections of healthy and infected crown tissue revealed that vascular bundles and metaxylem vessels were more abundantin crowns of Spineless Perfection than Cougar. Twelve to 48 h post inoculation (hpi), mycelia in the crown ofeach cultivar was limited to the cortex and hypodermal tissue. By 72 hpi, hyphae were observed in the cortex and endodermal tissue of Cougar and were concentrated in the phloem and parenchyma cells surrounding vascular bundles. Mycelia were limited to the outer cortex in Spineless Perfection. Mycelia and occluding material were present in the majority of metaxylem vessels of Cougar but not Spineless Perfection at 92 hpi; dissolution of parenchyma cells surrounding vascular bundles was apparent in Cougar. The vascular occlusions observed in Cougar may be responsible for plant wilting, a common disease symptom. Additional straightneck, crookneck, scallop, and acorn squash (C. pepo ssp. ovifera), and zucchini, marrow, and pumpkin (C. pepo ssp. pepo) cultivars were evaluated in a greenhouse study for resistance to root and crown rot. Cucurbita pepo ssp. ovifera cultivars were significantly more susceptible than C. pepo ssp. pepo to root and crown rot (P < 0.0001). Growing C. pepo ssp. pepo cultivars may be beneficial in an integrated Phytophthora management program.
机译：植物和植物腐烂的植物和植物腐烂在美国的南瓜生产区域造成相当大的年损失。 “无螺旋完美”西葫芦和“Cougar'Stricentneck壁球（Cougurnita Pepo L.）分别进行了部分抵抗和易受根和冠状腐蚀的，用于根和冠状物理因素的差异以及P. Capsici的皇冠感染的组织学。来自组织提取物的健康根和冠组织的pH和滴定酸度在品种之间没有显着差异（P = 0.05）。来自健康植物的混合和烘箱干根和冠组织的粗纤维含量（％）在品种之间相似。然而，干物质（％）对于Cougar最高（P = 0.05）。从每种品种收集的根部渗出物中的p.Capsici的殖民地直径相似。健康和受感染的冠组织的整个坐骑和组织学部分揭示了血管束和甲状腺肿的血管比美洲狮从无骨肉般的完美冠。接种后12至48小时（HPI）后，菌壁中的菌丝菌菌丝菌菌丝体仅限于皮层和皮下复枝组织。通过72 HPI，在COUGAR的皮质和内胚层组织中观察到菌丝，并浓缩在血管束周围的韧皮肌和实质细胞中。菌丝体仅限于无骨完美的外皮。菌丝体和闭塞材料存在于大多数美洲曲的血管血管中，但在92 HPI的无骨完美中存在;血管束周围的牙科细胞的溶解在美洲狮显而易见。在美洲狮观察到的血管闭塞可能是植物萎缩，常见的疾病症状。额外的直接直视，Crookneck，扇贝和橡子南瓜（C.Pepo SSP。Ovifera）和夏南瓜，骨髓和南瓜（C.Pepo SSP。Pepo SSP。Pepo）在温室研究中评估了对根和皇冠腐蚀的温室研究。 Cucurbita Pepo SSP。 Ovifera品种明显比C.Pepo SSP更容易受到影响。 Pepo到根和冠腐（p <0.0001）。生长C. Pepo SSP。 Pepo品种在综合的植物策划方案中可能有益。

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  • 来源
    《Plant Disease》 |2017年第5期|共7页
  • 作者

    Charles S. Krasnow; Raymond Hammerschmidt; Mary K. Hausbeck;

  • 作者单位

    Department of Plant Soil and Microbial Sciences Michigan State University East Lansing 48824;

    Department of Plant Soil and Microbial Sciences Michigan State University East Lansing 48824;

    Department of Plant Soil and Microbial Sciences Michigan State University East Lansing 48824;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物保护;
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