| a single dominant locus, ren4, confers rapid non-race-specific resistance to grapevine powdery mildew. | in the present study we screened the progeny of vitis vinifera × v. romanetii populations segregating for resistance to powdery mildew and determined the presence of a single, dominant locus, ren4, conferring rapid and extreme resistance to the grapevine powdery mildew fungus erysiphe necator. in each of nine ren4 pseudo-backcross 2 (pbc(2)) and pbc(3) populations (1,030 progeny), resistance fit a 1:1 segregation ratio and overall segregated as 543 resistant progeny to 487 susceptible. in full-s ... | 2011 | 21091183 |
| protein-precipitable tannin in wines from vitis vinifera and interspecific hybrid grapes (vitis ssp.): differences in concentration, extractability, and cell wall binding. | although they possess significant viticultural advantages, interspecific hybrid grapes (vitis spp.) are reported to produce wine with lower tannin concentrations than european wine varieties (vitis vinifera). however, extensive quantitative data on this phenomenon as well as mechanistic explanations for these differences are lacking. a survey of primarily commercial wines from the finger lakes american viticultural area (new york) using a protein precipitation method determined that hybrid-based ... | 2014 | 25017417 |
| behavior of 3-isobutyl-2-hydroxypyrazine (ibhp), a key intermediate in 3-isobutyl-2-methoxypyrazine (ibmp) metabolism, in ripening wine grapes. | 3-isobutyl-2-hydroxypyrazine (ibhp) is thought to be a key intermediate in both the biosynthesis and degradation of the herbaceous smelling 3-isobutyl-2-methoxypyrazine (ibmp), but its behavior during the growing season is not well understood. first, an improved method for ibhp quantification was developed. a deuterated ibhp standard was added to samples prior to isolation by mixed-mode cation exchange solid phase extraction. extracts were silylated prior to quantification by gc-ms. a limit of d ... | 2012 | 23163527 |