Major genes for resistance to beet necrotic yellow vein virus (BNYVV) in Beta vulgaris

Abstract

Inheritance of resistance to beet necrotic yellow vein virus (BNYVV) was studied in segregating F2 and backcross families obtained from crosses between resistant plants of the sugar beet selection Holly-l-4 or the wild beet accession Beta vulgaris subsp . maritima WB42 and susceptible parents . Greenhouse tests were carried out, in which seedlings were grown in a mixture of sand and infested soil . Virus concentrations of BNYVV in the rootlets were estimated by ELISA . To discriminate resistant and susceptible plants, mixtures of normal distributions were fitted to loglo virus concentrations, estimated for segregating Fl, F2 and BC populations of both accessions . The hypothesis that Holly-1-4 contained one single dominant major gene was accepted . For WB42, results fitted with the hypotheses that resistance was based on either one (or more) dominant major gene(s) showing distorted segregation, or two complementary dominant genes, which are both required for resistance . Resistance from WB42 appeared to be more effective against BNYVV than resistance from Holly-l-4 .

A new RAPD marker for beet necrotic yellow vein virus resistance gene in Beta vulgaris

“…maritima Arcang). Characteristics of both accessions were described by Scholten et al (1996). Resistant F 1 families obtained after crossing of Holly-1-4 or WB42 accessions in pairs with plants of one susceptible sugar beet genotype 261 (which is a self-fertile genotype and segregates for nuclear male sterility A:aa) and one annual beet accession from Sugar Beet Seed Institute.…”

“…Some investigations showed that resistance in WB42 is controlled by another dominant gene (Rz 2 ) (Lewellen 1995, Scholten et al 1997, Francis 1999. But, the exact number of resistance genes remained unclear (Lewellen et al 1987, Whitney 1989, Scholten et al 1996, 1997, ⎯⎯⎯⎯ 1999. However, Amiri et al (2003aAmiri et al ( , 2003b reported that the resistance to rhizomania in WB42 is controlled by one dominant gene.…”

“…(accesion Holly-1-4) and Beta vulgaris L. subsp. maritima Arcang (accesion WB42) are the most attractive sources of resistance to rhizomania (Lewellen et al 1987, Scholten et al 1996, 1997, 1999. Resistance in Holly-1-4 is controlled by a single dominant gene (Rz 1 ) (Lewellen et al 1987, Scholten et al 1996, 1997, Barzen et al 1997, Redfearn and Asher 1997.…”

“…maritima Arcang (accesion WB42) are the most attractive sources of resistance to rhizomania (Lewellen et al 1987, Scholten et al 1996, 1997, 1999. Resistance in Holly-1-4 is controlled by a single dominant gene (Rz 1 ) (Lewellen et al 1987, Scholten et al 1996, 1997, Barzen et al 1997, Redfearn and Asher 1997. Some investigations showed that resistance in WB42 is controlled by another dominant gene (Rz 2 ) (Lewellen 1995, Scholten et al 1997, Francis 1999.…”

Susceptibility and resistance of Beta vulgaris subsp. maritima to foliar rub-inoculation with Beet necrotic yellow vein virus

“…These results suggest that the factor for resistance to BNYVV in MR1 and MR2 lines is dominant and simply inherited, consistent with several previous observations that resistance to BNYVV in B. vulgaris subsp. maritima or in the Holly source is controlled by a single dominant gene (Lewellen et al 1987;Scholten et al 1996;Whitney 1989). One homogeneous plant line derived from BGRC54778 that had the YS phenotype was designated B. vulgaris subsp.…”