the potato tuberworm, phthorimaea operculella (zeller), is a major pest of potato in both store and field. in this research, host preference, biology and life table parameters of this pest were studied on leaves of 12 potato germplasm including seven commercial cultivars (agria, ausonia, sprit, satina, savalan, kondor, morene) and five iranian clones (pi396156-5, pi397045-15, pi397097-2, pi3970...

Five cycles of germination NaC1 tolerant alfalfa and the source population, 'Mesa Sirsa', were germinated in four salt solutions (NaC1, NaNO3, KC1, and KNO3) and Mannitol to try to determine the general mechanism involved in seed germination salt tolerance. Average germination over all germplasm sources in NaC1, NaNO3, KC1, KNO3, and Mannitol were 44.80, 38.88, 36.24, 29.07, and 60.93 percent, ...

The role of cereal germplasm banks is to collect, maintain, preserve, and distribute seeds representing the genetic diversity of crop species. While germplasm resources have traditionally been used in breeding efforts to improve a crop plant, they have also proved useful in both applied and basic research efforts to give insight into the biology of a crop plant (Harlan, 1975; Hyland, 1977; Spra...

This study reports on the cryostorage of embryogenic lines derived from selected mature Quercus robur trees, following application of the PVS2-vitrification based procedure. In seven oak genotypes, embryo recovery levels ranging from 57-92% were obtained when 4-6 mg embryo clumps were precultured for 3 days on 0.3 M sucrose basal medium, treated with PVS2 solution for 60 min at 24 degrees C, an...

Breeding progress in black raspberry (Rubus occidentalis L.) has been limited by a lack of genetic diversity in elite germplasm. Black raspberry cultivars have been noted for showing very few phenotypic differences and seedlings from crosses between cultivars for a lack of segregation for important traits. Despite these challenges, little molecular work has been done to explore genetic diversit...

examining all accessions in the core collection for a desired characteristic. This information is then used to A core collection (831 accessions) has been developed to represent determine which clusters of accessions in the entire germthe U.S. Arachis hypogaea L. germplasm collection. This core collection has been shown to be effective in improving the efficiency of plasm collection should be e...

Abstract The European honey bee Apis mellifera is the main pollinator for most crops used human consumption. However, a number of diseases, parasites, pesticides and other factors that generally result in widely described colony collapse disorder weakens colonies. In order to maintain existing germ lines facilitate creation new disease-resistant lines, it necessary ensure consistent breeding wo...

Exotic germplasm, that is, germplasm without commercial applicability, can broaden the genetic base in upland cotton (Gossypium hirsutum L.). The objectives of this study were to determine combining ability and identify parents from exotic germplasm for breeding. Twelve regionally adapted exotic germplasm lines were crossed with one cultivar and three elite germplasm lines in a North Carolina D...