| Abstract Detail
Plant Protection abu El-samen, Firas [1], Hammerschmidt, Ray [1], Kirk, William W [1], Douches, David [2]. Impact of different genotypes of seed-borne Phytophthora infestans on the emergence of potato plants with a range of susceptibility to potato late blight. THE transmission dynamics of potato late blight inoculum from seed to sprout and ultimately to the stem are still largely unknown. In this study, different potato cultivars and advanced breeding lines (ABL) were inoculated with different genotypes of Phytophthora infestans (US-1, US-8, US-11, US-6 and US-14) and were subsequently evaluated for the effect on plant emergence after planting and tuber rot severity in storage. P. infestans genotypes demonstrated variable ability to cause tuber rot and to reduce plant emergence from inoculated tubers. In both 2003 and 2004 trials, the US-8 genotype of P. infestans was the most aggressive genotype, reflected by poor emergence across all cvs. /ABL tested, followed by US-14. The US-1, US-6 and US-11 genotypes were the least aggressive causing only moderate reduction in emergence across cvs. /ABL tested. Similar trends were observed in tuber rot severity experiments, where the US-8 and US-14 caused the most severe tuber rotting. Values of relative area under emergence progress curve (RAUEPC) demonstrated that the cvs. /ABL Atlantic, MSJ453-4Y and Torridon were least susceptible across all P. infestans genotypes. In both trials cv. Pike was the most susceptible. Other cvs. /ABL demonstrated variable responses to different genotypes of P. infestans. Few cvs. /ABL demonstrated higher levels of tuber rot severity with P. infestans genotypes other than US-8. Results from this study suggest that highly aggressive genotypes of P. infestans such as US-8 may produce limited primary inoculum due to severe tuber rotting and deterioration of tubers before emergence but despite this observation the US-8 genotype is still predominant in North America.
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Related Links:
1 - Michigan State University, Plant Pathology, 35 Plant Biology Building, Wilson Road, East Lansing, MI, 48824, United States
2 - Michigan State University, Department of Crop and Soil Sciences, 499B Plan and Soil Sciences Building, East Lansing, Michigan, 48824, United States
Keywords:
Competitive fitness
Late Blight
Seed-borne.
Session: PAA03-7
Location: Hall of Ideas Room E/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 10:30 AM
Abstract ID:102 |
