Phenotypic variability for qualitative and quantitative attributes of certain grape hybrids

Abstract

The present investigation was carried out during 1986 and 1987 at IIHR, Bangalore, to evaluate the hybrids of the crosses Anab-e-Shahi, Angurb Kalan, Bangalore Blue, Black Champa, Convent Large Black, Thompson Seedless and Queen of the Vineyard, with respect to growth, fruitfulness, yield, quality, petiole nutrient contents and resistance to diseases. The salient findings of these investigations were seen as considerable variations in stem girth observed among the hybrids and parents. The hybrids 5/12 and 4/30 from the cross Anab-e-Shahi x Black Champa, hybrids 9/3 from the cross Anab-e-Shahi x Queen of the Vineyard and hybrids 29/4 and 29/5 from the cross Black Champa x Thompson Seedless had more trunk girth than rest of the hybrids. The hybrids 8/29, 29/4 and 29/5 appeared to be highly vigorous, while rest of the hybrids had low vigour. The hybrids 26/8 registered the minimum pruning weight. The percentage of increase in pruning weight of the hybrids was from 88.68% to 153.26% over the best parent, indicating for the tendency of the hybrids vigour. The parent Black Champa as a seed parent and Queen of the Vineyard as a pollen parent appeared to be best combiner for imparting high vigour to the progeny. The hybrids 4/30 had highest number of shoots. The hybrids 7/12 and 8/24 had minimum number of shoots. The hybrids which recorded the lowest angle of the shoot was 7/12 and 8/24. The hybrid 4/30 recorded the lowest shoot length in the both season, while the hybrid 29/5 recorded the highest shoot length in growth season and the hybrid 5/12 in fruiting season. Cane diameter increased invariably in hybrids compared to their parents. The genotypes with high number of shoots had less percentage of cane maturity. The hybrids 29/4 and 29/5 from the crosses Black Champa x Thompson Seedless had invariably number of leaves the better parent Bangalore Blue had the highest tolerance to all the diseases. While Anab-e-Shahi and Thompson Seedless appeared to be highly susceptible. The hybrid 30/40 had the least incident of anthracnose, while the hybrid 29/5 was highly susceptible. The hybrid 21/28 had higher downy mildew disease tolerance among all the progenies, while the hybrid 5/12, 7/12 and 26/8 were moderately tolerant. Hybrids 4/30, 8/24, 29/3 and 29/4 were highly susceptible.