Altered Phenotypic Response to Peronospora parasitica in Brassica juncea Seedlings Following Prior Inoculation with an Avirulent or Virulent Isolate of Albugo candida

被引:0
作者
U.S. Singh
N.I. Nashaat
K.J. Doughty
R.P. Awasthi
机构
[1] Plant–Pathogen Interaction Division,IACR
[2] G.B. Pant University of Agriculture and Technology (GBPUAT),Rothamsted
[3] Agriculture Center Monheim,Department of Plant Pathology
来源
European Journal of Plant Pathology | 2002年 / 108卷
关键词
compatibility; incompatibility; induced resistance; induced susceptibility;
D O I
暂无
中图分类号
学科分类号
摘要
A study was made of the biological interactions between an isolate of Peronospora parasitica compatible with Brassica juncea and two isolates of Albugo candida either incompatible or compatible with the host species. Prior inoculation with the incompatible isolate of A. candida induced resistance to subsequently inoculated P. parasitica. The degree of resistance was proportional to the zoosporangia concentration of the incompatible isolate and induced resistance was more marked in the cotyledon receiving the inducing inoculum compared to the opposite cotyledon and subsequently emerging true leaves that had not been pre-inoculated. Induction of resistance was also observed if the incompatible isolate of A. candida and P. parasitica were co-inoculated simultaneously. However, the effect was greater the longer the interval between inoculations, up to a period of 4 days. When the incompatible isolate of A. candida was inoculated 4h after P. parasitica, there was no marked effect on resistance to the latter. In contrast, prior inoculation with the compatible isolate of A. candida increased susceptibility to P. parasitica inoculated subsequently. However, pre- or co-inoculation with P. parasitica suppressed the development of the compatible isolate of A. candida. A spectrum of responses was observed when one cotyledon was inoculated simultaneously with both the incompatible and compatible isolates of A. candida and followed subsequently with P. parasitica after different time intervals. In such combinations, a transition was observed in the host response to P. parasitica from induced resistance/reduced susceptibility, which increased up to 24h following a simultaneous inoculation with incompatible + compatible isolates of A. candida to an almost neutral reaction after 72h to induced susceptibility after 96h. This range of altered responses appeared to reflect the outcome of the differing kinetics and counter-effects of resistance and susceptibility induction.
引用
收藏
页码:555 / 564
页数:9
相关论文
共 66 条
[1]  
Adhikari KN(1998)Susceptibility in oats to stem rust induced by co-infection with leaf rust Plant Pathology 47 420-426
[2]  
McIntosh RA(1992)Induction of inaccessibility to Journal of Phytopathology 134 97-102
[3]  
Arase S(1994) by pre-inoculation of Plant Varieties and Seeds 7 85-89
[4]  
Fujita K(2001) in rice leaf-sheath cells European Journal of Plant Pathology 107 103-111
[5]  
Bisht IS(1987)White rust ( Canadian Journal of Plant Pathology 9 276-8
[6]  
Agrawal RC(1994)) severity in mustard ( Physiological and Molecular Plant Pathology 44 1-477
[7]  
Singh R(1991)) and its effect on seed yields Annals of Applied Biology 118 469-27
[8]  
Bostock RM(1975)Signal interaction in induced resistance to pathogens and insect herbivores Physiological Plant Pathology 6 19-607
[9]  
Karban R(1996)Phytoalexin accumulation in rapeseed leaves challenged with white rust ( Phytopathology 86 602-739
[10]  
Thaler JS(1998)) Phytopathology 88 735-383