Inheritance of Resistance to Pea Mosaic Virus in Pisum sativum

The high level of resistance to pea mosaic virus in the pea cultivar Bonneville is conferred by a single recessive gene. This factor, tentatively designated Pmv, is closely linked to mo, cyv, and sbm-2, which confer resistance to bean yellow mosaic virus, clover yellow mosaic virus, and the lentil strain of pea seedborne mosaic virus, respectively. These four genes are part of a cluster situated in linkage group 2. In the heterozygous condition mo was influenced by temperature, but cyv, pmv, and sbm-2 were no

Inheritance of resistance to plantago mottle virus in Pisum sativum L

Resistance to plantago mottle virus (PIMV) in pea (Pisum sativum) was determined to be conferred by a single dominant gene, designated Pmv. Although many PIMV-resistant pea cultivars are resistant also to bean yellow mosaic virus (BYMV), no linkage was detected between Pmv and mo, the factor conditioning resistance to BYM

Inheritance of Resistance to the NL-8 Strain of Bean Common Mosaic Virus in Pisum sativum

The NL-8 strain of bean common mosaic virus (BCMV-NL8) can infect Pisum sativum systemically without causing appreciable symptoms. The presence of the virus in susceptible genotypes can be ascertained by enzymelinked immunosorbent assays (ELISA) or indicator hosts. Resistance to BCMV-NL8 was found in domestic cultivars known to be resistant resistant to bean yellow mosaic virus (BYMV) and five other viruses. In crosses involving the multiresistant cultivar Bonneville and two susceptible lines, resistance to BCMV-NL8 was conferred by a single recessive gene, to which the symbol bcm is tentatively assigned. This gene is closely linked to a cluster of other resistance genes present on chromosome 2, conferring resistance to BYMV, clover yellow vein virus, pea mosaic virus, lentil strain of pea seed-borne mosaic virus, and watermelon mosaic virus 2. BCMV-NL8 was not detected in seeds of seven pea lines systemically infected with this viru

Inheritance of resistance to clover yellow vein virus in Pisum sativum

Most of the cultivars of Pisum sativum resistant to bean yellow mosaic virus (BYMV) were found to be resistant to clover yellow vein virus (CYVV). However, some accessions from Ethiopia (PI 193586 and PI 193835) and India (PI 347464, PI 347465, PI 347466, PI 347467, and PI 347492) were resistant to CYVV, but susceptible to BYMV. Conversely, others from China (PI 391630) and the USSR (PI 262818) were resistant to BYMV, but susceptible to CYVV, indicating that resistance to these two viruses is conferred by distinct genetic entitles. In the BYMV+CYVV-resistant cultivar Bonneville, resistance to CYVV was found to be inherited monogenlcally recessive (cyv). This gene appears to be closely linked to that conferring resistance to BYMV (mo), which is located on the second chromosome. In the accessions from Ethiopia and India, resistance to CYVV is conditioned by a second recessive gene (cyv-2), that is situated in a different linkage group. In the lines from China and the USSR, resistance to BYMV is conferred by mo. The possible origin of two distinct genes for resistance to the same isolate of CYVV is discusse

Inheritance of Resistance to a Third Pathotype of Pea Seed-Borne Mosaic Virus in Pisum sativum

Resistance to a newly recognized pathotype of pea seed-borne mosaic virus, PSbMV-P4, was found in PI 347492, an accession of Pisum sativum from India. In cross and backcross populations between PI 347492 and the susceptible cultivars Bonneville, Ranger, and PI 269816, resistance was determined to be monogenically recessive. The symbol sbm-4 is proposed for the gene conferring resistance to this pathotype of PSbM

Inheritance of Resistance to a Lentil Strain of Pea Seed-Borne Mosaic Virus in Pisum sativum

In Pisum sativum, two independently inherited single recessive genes were found to confer resistance to the same pathotype of pea seed-borne mosaic virus from lentil (PSbMV-L1). The gene sbm-2, present in the domestic cultivar Bonneville, was determined to be closely linked to mo, which conditions resistance to bean yellow mosaic virus and watermelon mosaic virus 2 and is known to be located in Pisum linkage group 2. The second gene, sbm-3, was found in PI 347492, a bean yellow mosaic virus-susceptible line from India, and apparently is located in a different linkage group. Both genes, independently of each other, confer resistance to PSbMV-L1, but whether they are repetitive entities remains to be determine

Resistance to papaya ringspot virus in Cucumis metuliferus and its relationship to resistance to watermelon mosaic virus 1

In cross and backcross populations of Pi 292190—an accession of Cucumis metuliferus (Naud.) Mey. resistant to papaya ringspot virus (PRVS)—with a susceptible line (Acc. 2459) of the same species, resistance to thia virus was conferred by a single dominant gene. Clones of F2 and testcross plants inoculated with PRSV or watermelon mosaic virus 1 (WMV-1) reacted Identically, suggesting that the factor for resistance to PRSV is closely linked to Wmv, or may be the same factor. PRSV and WMV-1 are known to be closely related serologically. Acc. 2459 of C. , metuliferus (‘horned cucumber' or ‘jelly melon') is a valuable host for the propagation of isolates of PRS

Inheritance of Resistance to cucumber Mosaic Virus in a Transgenic Tomato Line Expressing the Coat Protein Gene of the White Leaf Strain

In tomato (Lycopersicon esculentum Mill.), the coat protein (CP) gene of the white leaf strain of cucumber mosaic virus (CMV-WL) conferred a high level of resistance against American, Asian, European, and Oceanian strains belonging to both sero-groups of CMV. An analysis of genetic populations deriving from crosses and back-crosses of a homozygous CMV-resistant tomato line (TT5-007-11) with susceptible cultivars revealed that (1) the high level of resistance is conferred by a single dominant gene to which the symbol Cmv is assigned; (2) in grafts between CMV-resistant and -infected plants, the resistant plants developed systemic symptoms, indicating that they are not immune; (3) the CMV resistance is independent of the virus inoculum titer, and it can be effectively used for the production of F1 commercial hybrids; (4) the two markers, neomycin phosphotransferase II (NPT-II) and (β-glucuronidase (GUS), present in transgenic plants are not completely reliable for predicting resistance; and (5) Cmv confers resistance to most CMV strains containing satellltes (RNA5). but one mutant satellite derived from CMV-WL infected transgenic plants. This is the first report of a satellite that can interfere with the function of a CP gene. The valuable breeding line TT5-007-11 is resistant also to tobacco mosaic virus (Tm-22), Verticillium wilt, and Phytophthora infestans (Race 0

A Marker Locus, Adh-1, for Resistance to Pea Enation Mosaic Virus in Pisum sativum

Linkage between Adh-1, the locus specifying the more anoda) isozyme of alcohol dehydrogenase, and En, the locus controlling resistance to pea enation mosaic virus, was investigated in the garden pea, Pisum sativum L. A recombination frequency of 4% was observed between the two loci, indicating that Adh-1 may be a practical marker for En. The use of Adh-1 in combination with other loci as brackets around En, thereby increasing the reliability of an indirect screen, is also discusse