Further Studies on Interspecific Genetic Relationships in Lactuca ^
نویسنده
چکیده
In an earlier paper, Thompson, Whitaker, and Kosar ^ reported on some genetic relationships between certain species of the 9-chromosome and of the IT-chromosome group of the genus Lactuca. Whitaker and Thompson^ presented data on some cytological aspects of these same species. In the first of these papers mention was made of 2 of the 8-chromosome species, but no compatibility relationships were^ presented. The present paper shows some of the compatibility relationships found to exist between certain of the 8-chromosome species and species of the 9and 17-chromosome groups. The studies on species relationships were undertaken for the purpose of isolating genetic factors for resistance to certain lettuce diseases, aster yellows in particular, and factors for hardiness and of determining the extent to which the species carrying such factors can be crossed with the cultivated form Lactuca sativa. This paper concludes certain phases of these studies and summarizes the contributions made to date.
منابع مشابه
PHENETIC STUDIES IN AVENA SPECIES AND POPULATIONS OF IRAN
A multivariate statistical analysis was performed on morphological characters of sixty-one populations of Avena eriantha Dur. A. clauda Dur., A. barbata Pott ex Link., A. wiestii Steud., A. fatua L., A. sterilis ssp. ludoviciana L. and A. sativa L. Factor analysis revealed that intraspecific morphological variations are due to quantitative characters. Interspecific as well as intersectional rel...
متن کاملIdentification of Drought Tolerant Lines from Interspecific Hybridization in Two Different Genetic Backgrounds of Barley under Different Irrigation Regimes
Domestication and artificial selection have reduced the level of genetic variation in barley. Inter-specific hybridization is one of the most valuable ways to restore at least part of the lost variation. This study aimed to investigate genetic diversity and screening barley lines which possessed the desired traits, as well as drought tolerance, within two F3 populations derived by crossing a cu...
متن کاملGenetic and Taxonomic Studies in Gilia: VI. Interspecific Relationships in the Leafy-stemmed Gilias
متن کامل
A study on genetic differentiation in two species of Iranian bleaks, (Alburnus mossulensis) and (Alburnus caeruleus) (Teleostei, Cyprinidae) using simple sequence repeats
The genetic structure of the genus Alburnus is not well known and the phylogenetic relationships among its species are uncertain. In the present study, simple sequence repeats (SSRs or microsatellites) were used to evaluate genetic diversity and genetic differentiation between Alburnus mossulensis Heckel, 1843 from Kashgan River in Lorestan province and Alburnus caeruleus Heckel, 1843 from Gama...
متن کاملPhylogenetic relationships and genetic diversity of the USDA Vigna germplasm collection revealed by gene-derived markers and sequencing.
Phylogenetic relationships in the USDA Vigna germplasm collection are somewhat unclear and their genetic diversity has not been measured empirically. To reveal interspecific phylogenetic relationships and assess their genetic diversity, 48 accessions representing 12 Vigna species were selected, and 30 gene-derived markers from legumes were employed. Some high-quality amplicons were sequenced. I...
متن کامل