GENOTYPIC VARIATION IN PLANT-DISEASE RESISTANCE - PHYSIOLOGICAL RESISTANCE IN RELATION TO FIELD DISEASE TRANSMISSION
GENOTYPIC VARIATION IN PLANT-DISEASE RESISTANCE - PHYSIOLOGICAL RESISTANCE IN RELATION TO FIELD DISEASE TRANSMISSION
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DOI：
10.2307/2261502
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发表时间：
1993-06-01
影响因子：
5.5
通讯作者：
KELLY, AW
中科院分区：
文献类型：
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作者：
ALEXANDER, HM;ANTONOVICS, J;KELLY, AW
1. 白硅烯克隆基因型在花和芽接种6株紫黑穗病菌（Ustilago violace6）后的植株发病百分率存在差异。研究中采用的3种花芽接种方法对基因型的抗性排序影响不大。6株分离真菌的毒力无明显差异。多元回归分析表明，接种后的病株百分比是田间自然病害传播试验中相同基因型病害水平的重要预测因子。这一结果验证了接种法在该系统中进行大规模抗性试验的可行性。花物候是一种影响田间孢子沉积可能性的植物性状，也是田间病害水平基因型变异的重要部分。因此，在解释自然界疾病发病率模式时，应考虑生理抗性和影响传播的因素。
1. Cloned genotypes of Silene alba differed in the percentage of plants that became diseased following floral and bud inoculation with six isolates of the fungus Ustilago violacea.2. The three flower and bud inoculation methods used in the study had little effect on the resistance ranking of the genotypes.3. No differences in virulence were found among the six fungal isolates.4. Multiple regression analyses revealed that the percentage of diseased plants following inoculation was an important predictor of disease levels of the same genotypes in a field experiment with natural disease transmission. This result validates the use of inoculation methods for large-scale resistance testing in this system.5. Floral phenology, a plant trait that affects the likelihood of spore deposition in the field, also accounted for a significant portion of the genotypic variation in field disease levels.6. Thus, both physiological resistance and factors affecting transmission should be considered when interpreting patterns of disease incidence in nature.