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首页> 外文期刊>Mycologia >PUCCINIA RUGISPORA - AN UNUSUAL MICROCYCLIC RUST ENDEMIC TO HAWAII
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PUCCINIA RUGISPORA - AN UNUSUAL MICROCYCLIC RUST ENDEMIC TO HAWAII

机译：PUCCINIA RUGISPORA-夏威夷特有的微环锈病

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摘要

Puccinia rugispora, a recently-described microcyclic rust on the endemic forest tree Zanthoxylum dipetalum (Rutaceae) in Hawaii, forms telia deep within the leathery leaf tissue of its host. Teliospores exhibited unusual germination behavior by production of a sequence of two spherical vesicle-like germination structures from each cell rather than germ tubes or elongate metabasidia as in most rusts. A sterigma bearing a basidiospore was produced on one or both of the globoid segments. Direct production of a germ tube from the distal-most segment of the germination structure at times also was observed. Karyogamy occurred in the young teliospore, followed by migration of the nucleus into the germination structure, where one or more mitotic divisions provided one or two large diploid nuclei for each segment. One of the nuclei migrated into the developing basidiospore and underwent meiosis, producing four small nuclei in the basidiospore. Whereas this behavior is atypical of the rusts in general, it agrees with unusual teliospore germination and nuclear behaviors observed in other Hawaiian rusts which have evolved with their hosts in isolation from continental forms. [References: 16]
机译：Puccinia rugispora是最近在夏威夷的特有森林树Zanthoxylum dipetalum（Rutaceae）上描述的微环锈，在其寄主的皮革状叶组织内深处形成telia。通过从每个细胞中产生一系列的两个球形囊泡状发芽结构，而不是像大多数锈病中那样，胚芽管或细长的亚基生芽孢，芽孢表现出不同寻常的发芽行为。在一个或两个球形部分上产生带有担子孢子的立体视。还观察到有时从发芽结构的最远段直接产生胚芽管。核型发育发生在年轻的孢子体中，随后细胞核迁移到发芽结构中，其中一个或多个有丝分裂分裂为每个区段提供一个或两个大二倍体核。其中一个核迁移到发育中的孢子孢子并进行了减数分裂，在孢子孢子中产生了四个小核。尽管这种行为通常是铁锈的非典型现象，但它与其他夏威夷铁锈中观察到的异常的孢子萌发和核行为是一致的，这些夏威夷铁锈的发芽与寄主分离，与大陆形式隔离。 [参考：16]

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