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首页> 外文期刊>Mycologia >Nonlinear colony extension of Sclerotinia minor and S. sclerotiorum.
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Nonlinear colony extension of Sclerotinia minor and S. sclerotiorum.

机译：小核盘菌和 S的非线性菌落扩展。硬化菌。

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Fungal colonies initially extend exponentially and reach a constant linear extension rate determined solely by their growth in the peripheral zone. However the radial extension rates of Sclerotinia sclerotiorum and S. minor accelerate over time on PDA. Experiments were conducted to analyze the variable extension rates of the two Sclerotinia species and compare them with those of Verticillium dahliae and Cladosporium sp. In addition, the effects of starter disk size, disk position in the parent colony, the age of the parent colony, the concentration of potato dextrose broth and of incubation temperature also were determined. While the growth of Cladosporium sp. and V. dahliae followed established linear trends, the radial extension of S. sclerotiorum and S. minor colonies continuously accelerated over time until they reached the edge of the (150 mm diam) Petri dish. A polynomial model fitted the radial extension of colonies of Sclerotinia spp. Furthermore the accelerating colony extension rate was partly due to increasing colony radius. The rates of extension from mycelial disks transferred from the parental colony were positively correlated with the radius of the mycelial disks transferred. The rates of extension also were dependent on where the transferred disks were taken from parent colonies and the age and radius of the parent colony. On potato dextrose agar medium the extension rates of colonies of S. sclerotiorum and S. minor also were affected by broth concentration and temperature. With increasing nutrient concentration colony extension rates increased and were highest at 25 C. This study revealed a novel pattern of radial growth for Sclerotinia spp. that diverged from the established growth patterns of fungal colonies. Knowledge of the differences in growth behavior may be exploited in the laboratory studies on fungal competition and hyperparasitism and potentially in disease control strategies.
机译：真菌菌落最初以指数形式延伸，并达到恒定的线性延伸速率，该速率仅由它们在周围区域的生长决定。然而，菌核菌菌和 S的放射状延伸率。次要随着时间的推移在PDA上加速。进行了实验，以分析两种 Sclerotinia 菌种的可变延伸率，并将其与 Verticillium dahliae 和 Cladosporium sp的延伸率进行比较。另外，还确定了起始盘大小，亲代中盘的位置，亲代的年龄，马铃薯葡萄糖肉汤浓度和孵育温度的影响。而 Cladosporium sp的生长。和 V。大丽花遵循既定的线性趋势，即 S的径向延伸。硬化菌和 S。小菌落随时间不断加速，直到到达（150毫米直径）培养皿的边缘。多项式模型拟合了菌核菌的菌落的径向延伸。此外，加速的菌落扩展速率部分是由于菌落半径的增加。从亲代菌落转移的菌丝盘的延伸率与转移的菌丝盘的半径正相关。扩展速率还取决于从亲本菌落中取出转移盘的位置以及亲本菌落的年龄和半径。在马铃薯葡萄糖琼脂培养基上，iS菌落的扩展速率。硬化菌和 S。未成年人也受到肉汤浓度和温度的影响。随着营养物浓度的增加，菌落扩展速率增加，并在25°C时最高。这项研究揭示了菌核菌的放射状生长的新模式。与已建立的真菌菌落生长模式不同。在真菌竞争和超寄生虫的实验室研究中以及潜在的疾病控制策略中，可以利用生长行为差异的知识。

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