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首页> 外文期刊>Australasian Plant Pathology >Incidence of Stagonospora meliloti and Acrocalymma medicaginis in lucerne crowns and roots in eastern Australia, their comparative aggressiveness to lucerne and inheritance of reaction to S-meliloti in lucerne
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Incidence of Stagonospora meliloti and Acrocalymma medicaginis in lucerne crowns and roots in eastern Australia, their comparative aggressiveness to lucerne and inheritance of reaction to S-meliloti in lucerne

机译：澳洲东部的卢塞恩冠和根中Stagonospora meliloti和Acrocalymma medicaginis的发病率，它们对卢塞恩的相对侵略性以及对卢塞恩州S-meliloti的反应遗传

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The research presented indicates that lucerne crown and root rot caused by Stagonospora meliloti is prevalent in southern New South Wales, whereas Acrocalymma medicaginis is the more commonly observed pathogen in Queensland. Although both pathogens cause reddening of internal root and crown tissue of lucerne, they can be distinguished by symptomatology. S. meliloti causes a diffuse red blotching of the internal tissue accompanied by the presence of an external lesion, whereas A. medicaginis causes red streaking at the extremity of wedge-shaped, dry-rotted tissue. Inoculation of propagules of a susceptible lucerne clone indicated that S. meliloti was the more aggressive pathogen. Although A. medicaginis does not cause leaf disease, there was a strong relationship between the leaf and root reaction of clones to S. meliloti. Inheritance of resistance to S. meliloti in lucerne appeared to be conditioned by a single dominant gene, based on segregations observed in S-1 and F-1 populations, but not in a backcross population from the same family where an excess of susceptible individuals (74% v. expected of 50%) was obtained in a cross of a resistant F-1 individual to the susceptible parent. Resistance appears to be highly heritable, however, and amenable to population improvement by breeding. A conclusion of the research is that breeding for resistance to S. meliloti for lucernes to be grown in southern Australia would appear to be a worthwhile objective. Presently, no highly resistant cultivars exist anywhere in the world.
机译：提出的研究表明，由苜蓿Stagonospora meliloti引起的卢塞恩树冠和根腐病在新南威尔士州南部普遍存在，而Acrocalymma medicaginis是昆士兰州最常见的病原体。尽管这两种病原体都会导致卢塞恩的内部根和冠状组织变红，但可以通过症状学加以区分。苜蓿链球菌引起内部组织的弥漫性红色斑点，并伴有外部病变，而药用曲霉导致楔形干枯组织的末端出现红色条纹。接种易感的卢塞恩克隆繁殖体表明，苜蓿链球菌是更具侵略性的病原体。尽管A. medicaginis不会引起叶片疾病，但克隆的根与叶片的根与叶反应之间存在着很强的关系。基于在S-1和F-1群体中观察到的隔离，卢塞恩对苜蓿链球菌的抗性传承似乎是由单个显性基因决定的，而不是来自同一家庭的回交群体，那里易感个体过多（在抗性F-1个体与易感亲本的杂交中获得了74％对预期的50％。但是，抗性似乎是高度可遗传的，并且可以通过繁殖来改善种群。该研究的结论是，为了在澳大利亚南部种植对卢塞恩的苜蓿链球菌具有抗性而进行育种似乎是一个有价值的目标。目前，世界上没有任何高抗性品种。

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