The inheritance and nature of a symptomless infection by a Willamette strain of pea streak virus in Pisum sativum L. Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bn999994h

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  • Pea streak virus (Marmor trifolii Holmes) is widespread and occasionally destructive in Eastern Oregon and Washington, and in many other pea growing areas. Since control by the use of insecticides to kill the insect vector is only partially successful, resistant varieties of peas are needed. In a study to confirm the mode of inheritance of resistance to a strain of pea streak virus (PSV), resultant data suggested that resistance is governed by a single recessive gene. Resistant plants were infected and supported a substantial virus concentration, but were symptomless. The virus concentration in resistant plants, as determined by local-lesion assay in Chenopodium amaranticolor, approximated that of plants showing severe symptoms. The effects of various environmental factors on symptom expression by several types of peas were studied to facilitate studies and breeding. The symptom expression was affected by seasonal change, soil fertility, and plant growth conditions. Plant height was reduced by PSV infection in susceptible varieties but not in the symptomless or resistant type of plants. Symptom expression was more pronounced when plants were grown in soils which did not favor vigorous growth. When growth was reduced by chemical retardants or excess fertilizer, symptoms were more pronounced.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-11-16T20:15:05Z (GMT) No. of bitstreams: 1 TSAIDEAN-DUAN1970.pdf: 956958 bytes, checksum: 66ff435693b783e932067cb1aec41556 (MD5)
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