Dynamic Genetic Analysis of Resistance to Alternaria Leaf Blight in Carrot
OU Cheng-gang1，CAO Qiong-wen1，ZHAO Zhi-wei1，REN Huai-fu2，LI Cheng-jiang 2* ，ZHUANG Fei-yun 1，3*
1 Key Laboratory of Horticultural Crop Biology and Germplasm Innovation，Ministry of Agriculture and Rural Affairs；
Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 10008，China；2 Suzhou Academy
of Agricultural Science，Suzhou 234000，Anhui，China；3 Xining Vegetable Institute，Xining 810016，Qinghai，China
Taking additive-dominance genetic model，and using 19 orange carrot lines as experiment
material to prepare their 63 F1 crosses，this paper studied the dynamic genetic law of Alternaria leaf blight
resistance during 3 stages．The results indicated that the additive effect was the major genetic effect，which
reached significant level during median and late stages（VA=0.656 and 0.551）and increased significantly in
median stage，indicating that this stage was the suitable time to study related resistant genes．The dominance
effect was increased significantly and reached the highest value（VD=0.311）in late stage．There were narrow
heritability and broad heritability existed in Alternaria leaf blight resistence．The highest were 0.574 and 0.827，
indicating that selecting resistant parent could improve disease resistance in offspring．Five parent materials，
which could significantly improve Alternaria leaf blight resistence in offspring，were obtained．They were
P12，P14，P15，P16，P17．
