Genetic diversity in a germplasm collection of Brassica rapa subsp rapa
L. from northwestern Spain |
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Authors: | Guillermo Padilla María Elena Cartea Víctor Manuel Rodríguez Amando Ordás |
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Institution: | (1) Misión Biológica de Galicia, Consejo Superior de Investigaciones Científicas (CSIC), Apartado 28, E-36080 Pontevedra, Spain |
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Abstract: | In Galicia (northwestern Spain), Brassica rapa subsp. rapa L. includes turnips, turnip greens, and turnip tops. The objectives of this study are (i) to determine the genetic diversity
and morphological resemblances among the B. rapa landraces of northwestern Spain in order to have information relative to the resources preserved, and (ii) to evaluate their
agronomic characteristics, considering the three potential products that can be harvested. A collection of 120 landraces was
evaluated for 34 morphological and agronomical traits by an augmented design at two locations. Two landraces were the most
promising for turnips production (MBG-BRS0183 and MBG-BRS0256), two showed the best characteristics for turnip greens (MBG-BRS0082
and MBG-BRS0184), and three were the most appropriate landraces for turnip tops production (MBG-BRS0143, MBG-BRS0173 and MBG-BRS0401).
Landraces were classified into five clusters (A–E) using the Ward–MLM (Modified Location Model) strategy: (A) included plants
with the worst agronomic potential, (B) included most of the turnip populations with rosette growth habit, (C) included turnip
populations without rosette growth habit, having more vigorous plants than cluster B, (D) gathered the most vigorous local
varieties, with the highest early vigor, fresh matter content per leaf, and number of secondary stems per plant, and (E) landraces
characterized by their earliness, large flowering periods, high numbers of secondary stems, and large seed weights. As conclusion,
landraces evaluated in this work displayed enough variability to differentiate among appropriate populations for each one
of the distinct crops. Their classification, using the Ward–MLM strategy, grouped accessions with similar characteristics
into homogeneous categories. |
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Keywords: | Brassica rapa cluster landrace turnip turnip green turnip top |
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