Wild Lathyrus species as genetic resources for improvement of Grasspea (L.sativus)
Wild Lathyrus species as genetic resources for improvement of Grasspea (L.sativus)
This was a study of five wild species of Lathyrus to determine whether they were useful as genetic resources for the improvement of the Grasspea, Lathyrus sativus. The five species were: L.blepharicarpus, L.cicera, L.gorgoni, L.marmoratus and L.pseudocicera. These species are thought to be taxonomically close to each other and L.sativus.
The first objective was to explore the genetic diversity of the five species, including the breeding systems and the levels of neurotoxin ODAP in their seeds. A wide range of genetic variation was quantified. L.cicera and L.marmoratus were found to be consistently overlapping, and on further investigation were found to be close, with a problem of circumscription and separation between them. The hypothesis put forward was that either L.marmoratus is a geographical segregate of L. cicera, or that introgression occurs between the two species. There is a need for further study to resolve this problem. Levels of ODAP in L.marmoratus was found to be significantly lower than in the other species. There were also low ODAP individuals present in L.gorgoni and L.pseudocicera. These species are thus of potential in improving the L.sativus crop.
The second objective was to examine the possibilities for hybridisation both within the species and with L.sativus as a preliminary for transferring genes from them. The techniques of ovule rescue and embryo culture were seen to be highly successful in increasing both the species crosses from which hybrid materials were obtained, and the actual numbers of successful hybrids. The gene pool of L.sativus was effectively extended: we now believe that with sufficient detailed work, all hybrids between the five species may one day be achieved.
The third objective was to produce some of the interspecific hybrids. Hybrids were produced for new species combinations and several stored for further use. Of six confirmed but sterile hybrids, four were new combinations, and of seven confirmed hybrids yielding viable F2 seed, five were new combinations.
University of Southampton
1993
Kearney, John Philip
(1993)
Wild Lathyrus species as genetic resources for improvement of Grasspea (L.sativus).
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This was a study of five wild species of Lathyrus to determine whether they were useful as genetic resources for the improvement of the Grasspea, Lathyrus sativus. The five species were: L.blepharicarpus, L.cicera, L.gorgoni, L.marmoratus and L.pseudocicera. These species are thought to be taxonomically close to each other and L.sativus.
The first objective was to explore the genetic diversity of the five species, including the breeding systems and the levels of neurotoxin ODAP in their seeds. A wide range of genetic variation was quantified. L.cicera and L.marmoratus were found to be consistently overlapping, and on further investigation were found to be close, with a problem of circumscription and separation between them. The hypothesis put forward was that either L.marmoratus is a geographical segregate of L. cicera, or that introgression occurs between the two species. There is a need for further study to resolve this problem. Levels of ODAP in L.marmoratus was found to be significantly lower than in the other species. There were also low ODAP individuals present in L.gorgoni and L.pseudocicera. These species are thus of potential in improving the L.sativus crop.
The second objective was to examine the possibilities for hybridisation both within the species and with L.sativus as a preliminary for transferring genes from them. The techniques of ovule rescue and embryo culture were seen to be highly successful in increasing both the species crosses from which hybrid materials were obtained, and the actual numbers of successful hybrids. The gene pool of L.sativus was effectively extended: we now believe that with sufficient detailed work, all hybrids between the five species may one day be achieved.
The third objective was to produce some of the interspecific hybrids. Hybrids were produced for new species combinations and several stored for further use. Of six confirmed but sterile hybrids, four were new combinations, and of seven confirmed hybrids yielding viable F2 seed, five were new combinations.
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Published date: 1993
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Local EPrints ID: 462848
URI: http://eprints.soton.ac.uk/id/eprint/462848
PURE UUID: 68e7d19b-3e1a-4630-9822-3d5d43f20e6b
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Date deposited: 04 Jul 2022 20:15
Last modified: 04 Jul 2022 20:15
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Author:
John Philip Kearney
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