Search Results

You are looking at 51 - 60 of 5,192 items for :

Clear All

factors could be minimized and the results would be more broadly applicable. Our first screening project involved primarily common rootstocks and other citrus selections ( Castle and Manthey, 1998 ). The selections ranked in terms of Fe 3+ reduction rates

Free access

Since the 1980s, there has been consistent progress in breeding and selection of cold-hardy, disease-resistant grape cultivars that are adapted to the cool, humid climates of the eastern and central United States. Many of these cultivars are based

Open Access

using cold-hardy C. japonica and C. oleifera selections. The cold-hardiness of ornamental camellia cultivars and hybrids has been documented in International Camellia Society reports ( https://camellia.iflora.cn/Cutivars/Country ). They are mostly

Open Access

breeding. Recent reports revealed not all grapefruit and pummelo cultivars contain high level of FCs ( Widmer, 2005 ; Widmer and Haun, 2005 ); some selections and low acid mutants have undetectable (read zero) or little amount of the components. Currently

Free access

Realized heritability estimates of bolting percentage, pink root and fusarium basal rot severities and incidences, and percentage of single-centered bulbs were estimated for half-sib families of an intermediate-day, open-pollinated onion (Allium cepa L.) population using selection response analysis. Half-sib families were selected based upon an index that equally weighted bolting percentage, pink root and fusarium basal rot severities and incidences, percentage of single-centered bulbs, and bulb quality. Families were subjected to one cycle of half-sib family recurrent selection. Pink root and fusarium basal rot severity was reduced by 17% and 7%, respectively, with realized heritability estimates of 1.28 and 0.65, respectively. More progress for pink root severity was made than was selected. Disease incidence was reduced by 18% and 12%, respectively, with heritability estimates of 0.65 and 0.60, respectively. Very little progress was made for the percentage of single-centered bulbs and this was reflected in a heritability estimate of 0.17. Selection based upon multiple characters at the same time may reduce the effectiveness of making improvements in a single trait. However even with low to moderate heritability, improvements were made, and suggest that further improvements can be made through selection.

Free access

Abstract

Bruce 12-4 is a plum selection released for breeding purposes that possesses an unusual combination of disease resistance, tree longevity, cold hardiness and other characteristics. The seedling requires chilling of 700 hr of temperature below 7.2°C (45°F). This seedling has consistently produced high yields of fruit in central Alabama (Fig. 1).

Open Access

Abstract

A heterogeneous cucumber (Cucumis sativus L.) population (mostly gynoecious) was evaluated at five locations for single-plant fruit yield at the mature-fruit stage in 1981. Seeds from the highest-yielding plants were then harvested, combined, and partitioned into five lots. Seeds were combined such that each location received only the superior genotypes from the other four locations. This procedure was continued for an additional four cycles using two types of selection: single-plant selection for fruit number at the mature-fruit stage (1981–82) and half-sib family selection at the once-over harvest stage (1983–84). In 1985, yield improvement from selection was measured by compositing the seeds of the selected plants or families from each of the four cycles and five locations and planting them at the five locations. No progress was made for total, marketable, or early yield. Percentage of culls was reduced an average of 0.7% per cycle. Genotype by environment interaction among the diverse locations may have prevented progress for yield.

Open Access

China ( Dirr, 2016 ; Hu, 1989 ). It has been widely used as an ornamental and traditional medicine in China, Japan, and Korea ( Chen et al., 2018 ; Jo et al., 2019 ; Tezuka et al., 2013 ). To date, no selections or cultivars of the species have been

Open Access

-used cultivars were ‘Strawberry Festival’ and ‘Florida Radiance’, which occupied ≈60% and 10% of planted acreage, respectively. The UF strawberry breeding program has sought to improve fruit quality attributes over time through phenotypic recurrent selection

Free access

(NTEP), including the 2007 and 2013 National Bermudagrass Tests ( NTEP, 2007 , 2013 ). In addition, three OSU experimental lines were included in this test: OKS 2009-3, OKS 2011-1, and OKS 2011-4. These latter three selections were included because of

Full access