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Development of anthracnose resistant hybrids of the Greater Yam (Dioscorea alata L.) and interspecific hybrids with D. nummularia Lam.

Lebot Vincent, Abraham Kuttolamadathil, Kaoh Juliane, Rogers Charles, Molisalé Tari. 2019. Springer.
Development of anthracnose resistant hybrids of the Greater Yam (Dioscorea alata L.) and interspecific hybrids with D. nummularia Lam.
ARTICLE, (2019 ) - PUBLISHEDVERSION - English (en-GB)
Springer
OPENACCESS - Cirad license, info:eu-repo/semantics/restrictedAccess, https://agritrop.cirad.fr/mention_legale.html.
Audience : RESEARCHERS
Springer Nature B.V.
Subject
H20 - Maladies des plantes, F30 - Génétique et amélioration des plantes, Igname, Résistance aux maladies, Hybride
Domains
Agriculture, Biologie, Sciences du vivant, Agronomie
Description
Controlled pollinations were conducted to develop Dioscorea alata L. hybrids resistant to anthracnose (Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. Overall, 10,410 hand pollinations were carried out with Indian (IN) and Vanuatu (VU) clones in 53 different parental combinations, including diploids (2x) and tetraploids (4x) female and male plants. Pollination efficiency and seed set were comparable for IN2x × VU2x (54.6% and 23.0%) and IN2x × IN2x (57.4% and 28.9%). However, seedling survival with better resistance to anthracnose in nursery under natural disease pressure was higher for IN2x × IN2x (67.3%) compared to IN2x × VU2x (47.8%). IN2x female clones were crossed with VU2x and VU4x male clones in 12 parental combinations each. Pollination efficiency was higher for 2x parents (54.6%) compared to 4x parents (47.0%) but seed set (32.8%) and seedling survival (71.7%) were significantly higher for crosses between IN2x × VU4x. Overall, remarkable variation in pollination efficiency, seed set and seedling survival was observed between different parental combinations even when the same pollen parent was used. Interspecific hybridization between D. alata IN2x females and D. nummularia Lam. Vanuatu polyploid male was found to be successful with considerable variation in pollination efficiency, seed set and seedling survival (49.0, 20.8 and 35.3%). The hybrids exhibited intermediate characters between the two species with high tuber yield, anthracnose resistance but with fast tuber flesh oxidation. These results demonstrate the scope of polyploid and interspecific hybridization and the need for the international exchange of germplasm for D. alata genetic improvement.
Keywords
Colletotrichum gloeosporioides, Controlled pollination, Fruit set, Polyploidy, Seed set, Seedling survival
Language
English (en-GB)
Creators
Lebot Vincent, Abraham Kuttolamadathil, Kaoh Juliane, Rogers Charles, Molisalé Tari
Contributors
Sources
Genetic Resources and Crop Evolution
Coverage
Name of newspaper
Springer