Genetic relationships between Discorea alata L. cultivars
Isozyme variation was studied to determine genetic relationships among 269 cultivars of #Dioscorea alata# originating from the South Pacific, Asia, Alrica and the Caribbean. Four polymorphic enzyme systems (MDH, PGI, SkDH' 6PGD) revealed 66 isozyme phenotypes, or zymotypes, each uniquely characterized by the presence or absence of 27 electromorphs. Identical zymotypes were found to be distributed in different geographical areas and vice versa, different zymotypes exist within the same geographic zone. Subsequently, distinct local cultivars from the New Caledonia germplasm collection were rated and 131 morphotypes were identified by 25 morpho-agronomic descriptors. Four major groups of morphotypes were identified and compared with the zymotypes of the described accessions. Each of the 131 cultivars was also analysed for the physico-chemical characteristics of the tubers (percent dry matter, percent starch, total minerals, proteins content, polyphenolic compounds, P, K and Ca contents) and three major chemotypic groups were identified. No correlations were found between morphotypes, zymotypes and chemotypes of accessions grown in a common garden. Many cultivars exhibited variation in qualitative traits, such as anthocyan pigmentation, probably as a result of human selection of somatic mutations. The most widespread #D. alta# cultivars exhibit a narrow genetic base. However, the existing genetic variation is also due to ancient sexuel recombinations as demonstrated by the isozyme patterns. #Dioscorea alata# might be a true species and not a putative cultigen as previously reported.
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Subjects: | F30 - Génétique et amélioration des plantes, Dioscorea alata, variété, isoenzyme, variation génétique, tubercule, propriété physicochimique, http://aims.fao.org/aos/agrovoc/c_2289, http://aims.fao.org/aos/agrovoc/c_8157, http://aims.fao.org/aos/agrovoc/c_15987, http://aims.fao.org/aos/agrovoc/c_15975, http://aims.fao.org/aos/agrovoc/c_7998, http://aims.fao.org/aos/agrovoc/c_1521, |
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dig-cirad-fr-3903942024-01-27T23:22:54Z http://agritrop.cirad.fr/390394/ http://agritrop.cirad.fr/390394/ Genetic relationships between Discorea alata L. cultivars. Lebot Vincent, Trilles B., Noyer Jean-Louis, Modesto J.. 1998. Genetic Resources and Crop Evolution (45) : 499-509.https://doi.org/10.1023/A:1008603303314 <https://doi.org/10.1023/A:1008603303314> Genetic relationships between Discorea alata L. cultivars Lebot, Vincent Trilles, B. Noyer, Jean-Louis Modesto, J. eng 1998 Genetic Resources and Crop Evolution F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 Isozyme variation was studied to determine genetic relationships among 269 cultivars of #Dioscorea alata# originating from the South Pacific, Asia, Alrica and the Caribbean. Four polymorphic enzyme systems (MDH, PGI, SkDH' 6PGD) revealed 66 isozyme phenotypes, or zymotypes, each uniquely characterized by the presence or absence of 27 electromorphs. Identical zymotypes were found to be distributed in different geographical areas and vice versa, different zymotypes exist within the same geographic zone. Subsequently, distinct local cultivars from the New Caledonia germplasm collection were rated and 131 morphotypes were identified by 25 morpho-agronomic descriptors. Four major groups of morphotypes were identified and compared with the zymotypes of the described accessions. Each of the 131 cultivars was also analysed for the physico-chemical characteristics of the tubers (percent dry matter, percent starch, total minerals, proteins content, polyphenolic compounds, P, K and Ca contents) and three major chemotypic groups were identified. No correlations were found between morphotypes, zymotypes and chemotypes of accessions grown in a common garden. Many cultivars exhibited variation in qualitative traits, such as anthocyan pigmentation, probably as a result of human selection of somatic mutations. The most widespread #D. alta# cultivars exhibit a narrow genetic base. However, the existing genetic variation is also due to ancient sexuel recombinations as demonstrated by the isozyme patterns. #Dioscorea alata# might be a true species and not a putative cultigen as previously reported. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/390394/1/390394.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1023/A:1008603303314 10.1023/A:1008603303314 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=89967 info:eu-repo/semantics/altIdentifier/doi/10.1023/A:1008603303314 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1023/A:1008603303314 |
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F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 |
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F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 Lebot, Vincent Trilles, B. Noyer, Jean-Louis Modesto, J. Genetic relationships between Discorea alata L. cultivars |
description |
Isozyme variation was studied to determine genetic relationships among 269 cultivars of #Dioscorea alata# originating from the South Pacific, Asia, Alrica and the Caribbean. Four polymorphic enzyme systems (MDH, PGI, SkDH' 6PGD) revealed 66 isozyme phenotypes, or zymotypes, each uniquely characterized by the presence or absence of 27 electromorphs. Identical zymotypes were found to be distributed in different geographical areas and vice versa, different zymotypes exist within the same geographic zone. Subsequently, distinct local cultivars from the New Caledonia germplasm collection were rated and 131 morphotypes were identified by 25 morpho-agronomic descriptors. Four major groups of morphotypes were identified and compared with the zymotypes of the described accessions. Each of the 131 cultivars was also analysed for the physico-chemical characteristics of the tubers (percent dry matter, percent starch, total minerals, proteins content, polyphenolic compounds, P, K and Ca contents) and three major chemotypic groups were identified. No correlations were found between morphotypes, zymotypes and chemotypes of accessions grown in a common garden. Many cultivars exhibited variation in qualitative traits, such as anthocyan pigmentation, probably as a result of human selection of somatic mutations. The most widespread #D. alta# cultivars exhibit a narrow genetic base. However, the existing genetic variation is also due to ancient sexuel recombinations as demonstrated by the isozyme patterns. #Dioscorea alata# might be a true species and not a putative cultigen as previously reported. |
format |
article |
topic_facet |
F30 - Génétique et amélioration des plantes Dioscorea alata variété isoenzyme variation génétique tubercule propriété physicochimique http://aims.fao.org/aos/agrovoc/c_2289 http://aims.fao.org/aos/agrovoc/c_8157 http://aims.fao.org/aos/agrovoc/c_15987 http://aims.fao.org/aos/agrovoc/c_15975 http://aims.fao.org/aos/agrovoc/c_7998 http://aims.fao.org/aos/agrovoc/c_1521 |
author |
Lebot, Vincent Trilles, B. Noyer, Jean-Louis Modesto, J. |
author_facet |
Lebot, Vincent Trilles, B. Noyer, Jean-Louis Modesto, J. |
author_sort |
Lebot, Vincent |
title |
Genetic relationships between Discorea alata L. cultivars |
title_short |
Genetic relationships between Discorea alata L. cultivars |
title_full |
Genetic relationships between Discorea alata L. cultivars |
title_fullStr |
Genetic relationships between Discorea alata L. cultivars |
title_full_unstemmed |
Genetic relationships between Discorea alata L. cultivars |
title_sort |
genetic relationships between discorea alata l. cultivars |
url |
http://agritrop.cirad.fr/390394/ http://agritrop.cirad.fr/390394/1/390394.pdf |
work_keys_str_mv |
AT lebotvincent geneticrelationshipsbetweendiscoreaalatalcultivars AT trillesb geneticrelationshipsbetweendiscoreaalatalcultivars AT noyerjeanlouis geneticrelationshipsbetweendiscoreaalatalcultivars AT modestoj geneticrelationshipsbetweendiscoreaalatalcultivars |
_version_ |
1792491351912218624 |