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Inheritance of resistance to tobacco-etch virus in Capsicum frutescens and in Capsicum annuum

Inheritance of resistance to tobacco-etch virus in Capsicum frutescens and in Capsicum annuum

Phytopath 46(7): 371-375

Resistance to the tobacco-etch virus in Capsicum frutescens L., Plant Introduction 152225 from Peru, and in C. annuum L. var. Cayenne, South Carolina 46252, was inherited monofactorially and determined by recessive genes. These 2 genes have been assigned the symbols etf and eta, the superscripts denoting their respective species origin. The corresponding dominant alleles have been designated by the symbols etf+ and eta+. It is not known whether the genes etf and eta are alleles. These genes are postulated to determine a slow rate of multiplication of the virus and masking of symptoms, thus permitting a sharp separation of susceptible from resistant plants 3 weeks after inoculation. In C. annuum (S.C. 46252), one or more modifying genes that increase the resistance level to apparent immunity are postulated to account for the occurrence of such plants in F2 and among the selfed progeny of highly resistant parent plants. Whereas absolute immunity in S. C. 46252 seems improbable, the possibility of its attainment by selection of minor genes for resistance cannot be excluded. Of the 2 resistances, that of S. C. 46252 is probably the higher, and therefore the better for use in breeding. Moreover, the sterility barrier that was encountered in the interspecific cross C. frutescens F2 (P. I. 152225 x Tabasco) x C. annuum var. Pimiento is a deterrent to the use of P.I. 152225 for breeding varieties of C. annuum resistant to tobacco-etch virus. Most of the commercial pepper varieties that are grown in the United States fall in the C. annuum group.

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