Abstract
Sechium edule (Jacq.) Sw. (Cucurbitaceae) is a species native to Mexico and Central America. The collection, characterization, and evaluation of accessions maintained in genebanks is essential for the conservation of this species. However, there are no specific varietal descriptors that differ from those used in a phenetic approach and are adapted to international registration guidelines to help distinguish, improve, cluster, and protect intraspecific variants of common use and those obtained by breeding. Therefore, 65 morphological descriptors (qualitative and quantitative) were evaluated in 133 accessions obtained from Mexico, Guatemala, and Costa Rica located in the National Germplasm Bank of S. edule in Mexico. These characteristics were observed to be phenetically stable for five generations under the same agroclimatic conditions. In addition, an analysis of amplified fragment length polymorphism (AFLP) was applied to 133 samples from a set of 245 accessions. According to the multivariate analysis, 26 of the 65 descriptors evaluated (qualitative and quantitative) enabled differentiation of varieties of S. edule. The AFLP analysis showed a high level of polymorphism and genetic distance between cultivated accessions and their corresponding wild ancestor. The variations in S. edule suggest that the morphological characteristics have differentiated from an essentially derived initial edible variety (ancestral original variety), but unlike other cucurbits, there is no evidence of the ancestral edible for Sechium since the seed is unorthodox and there are no relicts.
Funder
the Plant Transgenic Design Initiative (P-TraD) at Tsukuba Plant Innovation Research Center, University of Tsukuba, Japan
Subject
Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics
Reference40 articles.
1. Identificación de descriptores morfológicos relevantes para la distinción de variedades y líneas élites de arroz venezolano con fines de protección intelectual;Agron. Trop.,2008
2. Phenomics of elite heirlooms of peppers (Capsicum annuum L.) from the Spanish centre of diversity: Conventional and high-throughput digital tools towards varietal typification;Fita;Sci. Hort.,2020
3. UPOV (2004). Arroz (Oryza sativa L.). Directrices Para la Ejecución del Examen de la Distinción, la Homogeneidad y la Estabilidad, Unión Internacional para la Protección de las Obtenciones Vegetales.
4. Phylogenetics of the genus Sechium P. Brown: A review;Spanish J. Agric. Res.,2021
5. Lira-Saade, R. (1996). Chayote. Sechium edule (Jacq.) Sw, IPGRI.
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