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Cytogenetics of the Festuca-Lolium Complex: Relevance to by Prem P. Jauhar

By Prem P. Jauhar

Provided listed below are glossy and classical elements of cytogenetics in addition to biotechnology when it comes to development of the Festuca-Lolium staff of grasses. Festuca and its shut relative Lolium are very worthwhile genera of temperate agriculture. those interesting genera comprise a few hugely effective, nutritious, and well-adapted grasses generic for agricultural and leisure reasons worldwide. The publication is organizedinto 15 chapters dedicated to taxonomy and systematics; species evolution and divergence via raise in chromosome quantity in addition to via switch in DNA content material; genetic keep an eye on of chromosome pairing and its breeding and phylogenetic implications; B chromosomes, triggered polyploidy and haploidy inrelation to varietal development; broad hybridization, genome relationships, and plant development; genomic stability relating to hybrid fertility and hererosis breeding; biotechnology and its capability functions in plant development. it really is of precise curiosity to geneticists, taxonomists, evolutionists, biotechnologists, and plant breeders.

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Extra resources for Cytogenetics of the Festuca-Lolium Complex: Relevance to Breeding

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On the basis of ability to hybridize, and fertility and meiotic chromosome pairing in the F\ hybrids, Borrill et al. (1977) found that the closest affinity was amongst the species within section Montanae (F. donax, F. drymeja, and F. altissima). There was also strong affinity between these species and F. scariosa, and a weak link with F. pratensis (Bovinae) and F. polesica (Ovinae). C. Gmel. are closely related. Although the spicate loliums can be readily distinguished from the paniculate festucas and vulpias, the change from a spike to a panicle or Cytotaxonomic Affinities 25 vice versa could have occurred in one step by a mutational event.

Although the spicate loliums can be readily distinguished from the paniculate festucas and vulpias, the change from a spike to a panicle or Cytotaxonomic Affinities 25 vice versa could have occurred in one step by a mutational event. , from panicle to spike (Essad 1962). For example, a spontaneous mutationaltransformation turned a spike into panicle in L. multiflorum (Fig. 1). Simply because this spontaneous mutant resembles a paniculate festuca, should it be called F. multiflorum? This observation simply shows the weakness of using inflorescence type alone in making generic distinctions.

The genus Festuca may be more ancient than Lolium, because it has a more diverse geographical distribution and a preponderance of polyploids (Malik and Thomas 1966a). , lenkin 1933, 1955b; Peto 1933; Crowder 1953a; Carnahan and Hill 1955; Wit 1959b; Beddows 1965; Essad 1964; Lewis 1966; lauhar 1975b, 1976). The intergeneric hybrids show very good chromosome pairing (Peto 1933; see lauhar 1975b, 1976 and references therein), and the species of the two genera bear considerable resemblance to each other.

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