Impact of Different US Genotypes of <Emphasis Type="Italic">Phytophthora infestans</Emphasis> on Potato Seed Tuber Rot and Plant Emergence in a Range of Cultivars and Advanced Breeding Lines |
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| Authors: | William W Kirk Firas Abu-El Samen Pavani Tumbalam Phillip Wharton David Douches Christian A Thill Asunta Thompson |
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| Institution: | (1) Department of Plant Pathology, Michigan State University, 35 Plant Biology Building, East Lansing, MI 48824, USA;(2) Department of Crop and Soil Science, Michigan State University, East Lansing, MI 48824, USA;(3) Department of Horticultural Science, University of Minnesota, St. Paul, MN 55108, USA;(4) Plant Sciences Department, North Dakota State University, Fargo, ND 58105, USA |
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| Abstract: | Seed pieces of different potato cultivars and advanced breeding lines (ABLs) from north central US breeding programmes were
inoculated with different genotypes of Phytophthora infestans (US-1, US-1.7, US-8, US-11 and US-14). The effect of these genotypes of P. infestans on seed piece rot severity after re-storage was assessed using an image analysis technique. P. infestans genotypes demonstrated variable ability to cause seed piece rot and to reduce plant emergence measured as final plant stand
(%) and the relative area under the plant emergence curve (RAUEPC). The US-8 genotype of P. infestans was the most aggressive genotype, as indicated by tuber rot severity across all cultivars/ABLs tested, followed by US-14
in both years. The US-1, US-1.7 and US-11 genotypes were the least aggressive, causing only moderate seed piece rotting across
cultivars/ABLs tested. Similar trends were observed in two field experiments, where the US-8 and US-14 genotypes delayed or
reduced emergence. Values of final plant stand (%) and RAUEPC demonstrated that the cultivars/ABLs Atlantic, MSJ453-4Y and
Torridon were the least susceptible across all P. infestans genotypes. In both experiments cv. Pike was the most susceptible. Other cultivars/ABLs demonstrated variable responses to
different genotypes of P. infestans. No symptoms of P. infestans were observed on emerged plants up to 60 days after planting. The variability of susceptibility of tubers to different genotypes
of P. infestans has implications for plant breeding efforts in that the major emphasis in the past has been to breed for foliar resistance,
with limited emphasis on the reaction of the tuber. Results from this study suggest that highly aggressive genotypes of P. infestans such as US-8 may lead 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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| Keywords: | Image analysis Plant stand Potato breeding Potato late blight RAUEPC Transmission Varieties |
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