Search Results

You are looking at 21 - 30 of 2,181 items for :

  • Refine by Access: All x
Clear All
Free access

Nihat Guner, Luis A. Rivera-Burgos, and Todd C. Wehner

ringspot virus type-W Scientia Hort. 94 297 307 Guner, N. Wehner, T.C. 2008 Overview of potyvirus resistance in watermelon. In: M. Pitrat (ed.). Cucurbitaceae 2008: Proc. of the IX th EUCARPIA Meeting on Genetics and Breeding of Cucurbitaceae. Avignon

Free access

Ying Li, Liyi Zhang, Zhen Zhang, Peihua Cong, and Zong-Ming Cheng

, P.A. Hofstee, M.E. Brewer, L.R. 2002 Genetic variability and preliminary heritability estimates of resistance to scab ( Venturia inaequalis ) in an apple genetics population N. Z. J. Crop Hort. Sci. 30 83 92 Calenge, F. Durel, C.E. 2006 Both stable

Free access

U. Lavi, J. Hillel, A. Vainstein, E. Lahav, and D. Sharon

1 Dept. of Fruit Trees, Genetics and Breeding, ARO, P.O. Box 6, Bet-Dagan 50250, Israel. 2 Dept. of Genetics, Faculty of Agriculture, The Hebrew Univ. of Jerusalem, Rehovot 76100, Israel. 3 Dept. of Horticulture and the Otto Warburg Center for

Open access

Bingqiang Wei, Lanlan Wang, Paul W. Bosland, Gaoyuan Zhang, and Ru Zhang

Trends Genet. 23 81 90 Elston, R.C. 1984 The genetic analysis of quantitative trait differences between two homozygous lines Genetics 108 733 744 Gai, J. Wang, J. 1998 Identification and estimation of a QTL model and its effects Theor. Appl. Genet. 97

Free access

Luwbia Aranda, Timothy G. Porch, Mark J. Bassett, Laura Lara, and Perry B. Cregan

the advent of the common bean genome sequence, SNP markers, and tools such as mutagenesis populations and TILLING ( Porch et al., 2009 ), novel methods are available for identifying genes of interest. Although the genetics of Cl have been studied

Free access

Thomas S. Brettin and Ken C. Sink

We have used isozyme techniques (SGE) to assess variation and begin construction of a genetic map of the Asparagus officinalis genome. Isozyme extraction buffers, electrophoretic buffer systems, and isozyme stability during storage were evaluated. Isozyme expression under different environmental conditions was also examined. Thirty-four enzymes were evaluated for their usefulness as genetic markers in A. officinalis. Of these 34, 13 had sufficient activity and resolution on the gels for isozyme analysis. Of the 13 enzyme systems resolved, polymorphisms were observed in aconitase, endopeptidase, malate dehydrogenase, phosphoglucomutase, and shikimate dehydrogenase. Segregation of putative alleles is presented for ACON, END, MDH, PGM and SKDH isozymes. Co-segregation data showed linkage between a SKDH locus and a PGM locus. The isozyme analysis also included Asparagus densiflorus `Sprengeri' and revealed that aspartate aminotransaminase, endopeptidase, and triosephosphate isomerase would be potentially useful for verification of cell fusion products between the two species.

Free access

Yonatan Elkind, Arie Gurnick, and Nachum Kedar

The objective of this study was to elucidate the genetic control of the semideterminate growth habit in tomato (Lycopersicon esculentum Mill.). A semideterminate tomato line was crossed with determinate and indeterminate lines; their F1, F2, and backcrosses were grown; and the growth habit recorded and analyzed. Plants with six or more inflorescences on the main stem were defined as semideterminate, while those with fewer were defined as determinate. The F2 and backcross to determinate were bimodal, indicating a single recessive gene for semideterminate, which was denoted as sdt. The goodness-of-fit chi square for a single recessive gene model was 88% and 69% for F2 and backcross generations, respectively. In the cross between semideterminate and indeterminate types, the results indicated control by two genes, sp and sdt, with the sp+ indeterminate type epistatic over semideterminate. The goodness-of-fit to this model was 70% and 82% for F2 and backcross generations, respectively.

Free access

Liang L. Hong, Kittipat Ukoskit, and Paul G. Thompson

Parents and progeny of four biparental crosses were analyzed for RAPD marker segregation. A range of 57 to 122 primers were tested in each cross, with an average of 82. Average polymorphic primers and band numbers were 22 and 53, respectively. Of the 212 polymorphic bands, phenotypic segregation ratios were as follows: 133 fitted 1 dominant: 1 recessive, 58 fitted 3:1, 11 fitted ratios 4:1 to 19:1 and 10 were distorted. The 1:1 and 3:1 ratios were expected for either diploid or hexaploid segregation, and the 4:1 to 19:1 are exclusive to hexploid. A total of 14 pairs of markers were linked at map distances ranging from 2.1 to 36.5 cM. One common pair of linked markers was found in two separate crosses.

Free access

Kimberly H. Krahl and William M. Randle

Petunia hybrida Vilm. is one of the major bedding plants grown worldwide, and, like most bedding plants, is grown primarily for its seasonal floral display. While increased floral and reflowering capacity have been the focus of breeding programs for many ornamental species, floral longevity has received little direct attention. Increased floral longevity would enhance the value of any crop grown for floral effect. In this study, four parental genotypes (two with short flower life, two with long flower life) were crossed in a partial diallel mating design to create six F1 families. The F1 individuals were then selfed and backcrossed to the appropriate parents to create F2 and backcross families. Data from parental and F1 genotypes were analyzed to determine general and specific combining ability for floral longevity in petunia. Results indicated the presence of significant additive gene effects and nonsignificant nonadditive gene effects for floral longevity in this germplasm. However, aberrant F2 and backcross family means were observed in all families. For each family, F2 and backcross means were lower than expected given normal Mendelian segregation. Further experiments will be necessary to elucidate the causes for the deviate F2 and backcross family means before specific recommendations for selecting for increased floral longevity in petunia can be made.