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首页> 外文期刊>Journal of Plant Biology >Epidermal cell response to rust hyphae and the resistance mode of tropical maize to southern corn rust (Puccinia polysora underwood)
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Epidermal cell response to rust hyphae and the resistance mode of tropical maize to southern corn rust (Puccinia polysora underwood)

机译：表皮细胞对锈菌丝的反应以及热带玉米对南方玉米锈病的抗性模式（Puccinia polysora underwood）

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摘要

Southern Corn Rust (SCR), caused byPuccinia polysora Underwood, is found primarily in the tropics, occurring especially during wet and cool winters in Hawaii. Whereas Hi38-71, a tropical Hawaiian super sweet corn, is resistant to SCR, the G24 inbred is susceptible. Anatomical traits are distinct in these two lines, with differences evident in their epidermal cell shapes, cell types, epidermal cell walls, hairs, and bulliform cells. Trichomes are found on the leaves of Hi38-71 plants and their epidermal surface cells are flat. In contrast, the epidermal surfaces of G24 leaves are circular, rough, and woolly, and are uniform in their size and pattern. These woolly epidermal leaf surfaces on the susceptible G24 provide access for disease infection while the trichomes and smooth leaves may confer more resistance in Hi38-71. Our genetic study utilized Generation Mean Analysis (GMA) of progenies derived from crosses of these two inbred lines. Resistance to SCR was scaled from 1 (resistant) to 9 (susceptible) in the winter and spring in Hawaii. Average scores for Hi38-71 and G24 were 3.1 and 6.9 respectively, while the F1 and F2 hybrids were both highly resistant to the rust. Both additive and dominant effects for SCR resistance were highly significant, as were their epistatic interactions [aa] and [dd]. However, the additive x dominance interaction was not. Therefore, a single dominant gene in inbred line Hi38-71 might be involved in determining its high resistance to SCR.
机译：南方玉米锈病（SCR）是由多角紫菜（Puccinia polysora Underwood）引起的，主要发现于热带地区，特别是在夏威夷的阴凉冬季。 Hi38-71（一种热带夏威夷超甜玉米）对SCR具有抗性，而G24自交系易感。这两条系的解剖特征不同，它们的表皮细胞形状，细胞类型，表皮细胞壁，毛发和牛状细胞明显不同。滴虫在Hi38-71植物的叶子上发现，它们的表皮表面细胞是平坦的。相比之下，G24叶片的表皮表面是圆形，粗糙和羊毛状，并且大小和样式均一。易感G24上的这些毛状表皮叶片表面为疾病感染提供了途径，而毛状体和光滑的叶片可能在Hi38-71中赋予了更大的抗性。我们的遗传研究利用了这两个自交系杂交后代的后代平均均值分析（GMA）。在夏威夷的冬季和春季，对SCR的抵抗力从1（抵抗力）提高到9（敏感度）。 Hi38-71和G24的平均得分分别为3.1和6.9，而F1 和F2 杂种均具有很高的抗锈性。 SCR抗性的加性效应和显性效应以及它们的上位相互作用[aa]和[dd]都非常显着。但是，不存在加性x优势相互作用。因此，近交系Hi38-71中的单个显性基因可能参与确定其对SCR的高抗性。

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