寄主品种——病原物小种寄生适合度中水平抗性与侵袭力关系的初步研究.pdf

31 1 植　物　病　理　学　报 　Vol.31　No. 1 20012 ACTA　PHYTOPATHOLOGICA　SINICA 　Feb.　　2001 : 0412-0914( 2001)01-0070-08 - * 袁军海 ,赵美琦, 曾士迈 姚裕琪,梁德霖 ( , 100094) (, 010031) : 8 2 , - , , : = () : ; ; : 432. 21: S A PRELIMINARY STUDY ON THE RELATIONSHIP BETWEEN HORIZONTAL RESISTANCE AND AGGRESSIVENESSIN THE PARASITICFITNESSOF INTERACTION BETWEEN HOST CULTIVARSAND PATHOGEN RACES YUAN Jun-hai, ZHAO ei-qi, ZENG Shi-mai (Department of Plant Pathology, China Agricultural University, Beijing 100094, China) YAO Yu-qi, LIANG De-lin (Inner ongolia Academy of Agricultural Sciences, Huhehot 010031, China) Abstract Greenhouse experiments were conducted to explore the interaction between eight: potato varieties and two races of Phy top hthora inf estans ( ontague) de Bary. The relationship between horizontal resistance and aggressiveness in the parasitic fitness of interaction between host cultivar and pathogen race was studied. It was found that in the case when no vertical re- sistance was involved or vertical resistance had been overcomed by virulence genes correspon- dingly, the product of relative horizontal resistance coefficient of cultivar and relative aggres- sivenessvalue of theraceturned to be parasiticfitness Their relativeformula was asfollowing. : relative parasitic fitness= horizontal resistanceaggressiveness Key ords parasitic fitness horizontal resistance aggressiveness: ; ; , [ 1] [ 19] , ,, : 1999-11-02; :2000-06-03 : ;(96-005-01-02-06) * :,,075131 :( 1969- ) , ,,,, 1 : - 71