Variation for Resistance to Alternaria tenuissima and Potential Structural Mechanism among Different Cultivars of Chrysanthemum morifolium  

作　　者：Huiyun Li Ye Liu Sumei Chen Jiafu Jiang Aiping Song Weimin Fang Fadi Chen 

机构地区：[1]State Key Laboratory of Crop Genetics and Germplasm Enhancement,Key Laboratory of Landscaping,Ministry of Agriculture and Rural Affairs,College of Horticulture,Nanjing Agricultural University,Nanjing,210095,China

出　　处：《Phyton-International Journal of Experimental Botany》2020年第4期851-859,共9页国际实验植物学杂志（英文）

基　　金：This work was funded by the National Key Research and Development Program of China(2019YFD1001501);the Earmarked Fund for Jiangsu Agricultural Industry Technology System(JATS[2019]421);the Fundamental Research Funds for the Central Universities(KYYJ201905)。

摘　　要：Black spot disease,caused by the necrotrophic fungus Alternaria tenuissima(Fr.)Wiltsh(A.tenuissima),is considered a highly destructive disease of Chrysanthemum(Chrysanthemum morifolium Ramat.).A set of 17 accessions of commercial chrysanthemum cultivars were evaluated for resistance to A.tenuissima by seedling artificial inoculation.It was found that the reaction of the accessions to artificial inoculation ranged from resistant to highly susceptible.Five varieties of chrysanthemum(‘Zhongshan Taogui’,‘Jinba’,‘Zhongshan Jinguan’,‘Jinling Wanhuang’and‘Jinling Yangguang’)were resistant;two varieties of chrysanthemum(‘Zhongshan Xinggui’and‘Zhongshan Jinkui’)were moderately resistant;and others were susceptible to various degrees,four varieties of chrysanthemum(‘Zhongshan Zihe’,‘Zhongshan Jiuhong’,‘Zaoyihong’and‘Jinling Jiaohuang’)were highly susceptible,especially.Some leaf morphological features of two resistant and two highly susceptible cultivars were further researched.Trichome density,length,height,gland size and stomata density were found to be associated with plant passive resistance.Resistant varieties that were identified in present study will be promising germplasm for exploitation of breeding programmes aimed at developing A.tenuissima-resistant cultivars and increasing genetic diversity.

关 键 词：Alternaria tenuissima commercial chrysanthemum cultivars disease resistance leaf morphology 

分 类 号：S51[农业科学—作物学]