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Evaluation of Nicaraguan common bean (Phaseolus vulgaris L.) landraces

Gómez, Oscar (2004). Evaluation of Nicaraguan common bean (Phaseolus vulgaris L.) landraces. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 476
ISBN 91-576-6762-4
[Doctoral thesis]

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Abstract

Common bean landraces are an important component of the cropping systems of the Nicaraguan small-scale farmers. They have also been used in breeding programs for the development of improved cultivars. The knowledge about these landraces is, however, incomplete as regards adaptive, physiological and molecular traits. Neither their genetic diversity and its distribution nor the way in which this genetic diversity has changed over time has been well studied. The general purpose of this work was to complement the knowledge already available about the Nicaraguan bean landraces in order to generate additional information with the aim of better utilization of them. More specifically the aims were to: 1) study the yield formation of landraces and bred cultivars; 2) determine their variation in adaptation; 3) determine the landrace genetic diversity and its structure; and 4) monitor changes in the diversity stored ex situ. The plant material consisted of red-seeded landraces currently in cultivation, landraces maintained ex situ in genebanks and two bred cultivars. Molecular and phenotypic evaluation of the plant material was done in contrasting environments. The landraces yielded less than the bred cultivars at the sites with the poorest environments but similarly to them at the other sites. The bred cultivars had longer leaf area duration during the seed filling period and a longer growth cycle all-together compared with the landraces. One bred cultivar (INTA-Masatepe) and two landraces (V16 and V29) showed good yield stability according to the AMMI analysis. The landraces varied in the amount of within-population genetic diversity. High proportion of it was distributed between populations. In general adaptive traits did not differ between the ex situ and in situ populations but they differed at the molecular level: the former had a lower genetic diversity than the latter. In conclusion, yield of the landraces varied but some performed as well as the bred cultivars. The main drawback of the landraces was their susceptibility to some biotic stress factors; however, not all of them were affected. In the landraces studied the genetic diversity was distributed within as well as among populations. It was also found that changes have occurred in the genetic diversity of the populations stored ex situ.

Authors/Creators:Gómez, Oscar
Title:Evaluation of Nicaraguan common bean (Phaseolus vulgaris L.) landraces
Year of publishing :September 2004
Volume:476
Number of Pages:30
Papers/manuscripts:
NumberReferences
ALLI. Gómez, O.J., Blair, M.W., Frankow-Lindberg, B.E. & Gullberg, U. 2004. Molecular and phenotypic diversity of common bean landraces from Nicaragua. Crop Science 44, 1412-1418. II. Gómez, O.J., Blair, M.W., Frankow-Lindberg, B.E. & Gullberg, U. 2004. Comparative study of common bean (Phaseolus vulgaris L.) landraces conserved ex situ in genebanks and in situ by farmers. Genetic Resources and Crop Evolution (In press). III. Gómez, O.J., & Frankow-Lindberg, B.E. Yield formation in Nicaraguan landraces of common bean (Phaseolus vulgaris L.) compared to bred cultivars (Submitted). IV. Gómez, O.J., Frankow-Lindberg, B.E. & Gullberg, U. Yield and yield stability of Nicaraguan landraces and bred cultivars of the common bean when grown in contrasting environments (Manuscript). Papers I and II are reproduced by permission of the journals concerned.
Place of Publication:Uppsala
ISBN for printed version:91-576-6762-4
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F62 Plant physiology - Growth and development
Subjects:Not in use, please see Agris categories
Agrovoc terms:kidney beans, crop yield, seed production, microsatellites, genetic variation, dry matter content, nicaragua
Keywords:Yield, GxE interaction, seed yield rate, microstaellites, genetic diversity, dry matter accumulation, dry matter partitioning
URN:NBN:urn:nbn:se:slu:epsilon-303
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-303
ID Code:612
Department:(NL, NJ) > Institutionen för ekologi och växtproduktionslära (fr.o.m. 990101)
Deposited By: Oscar Gómez
Deposited On:08 Sep 2004 00:00
Metadata Last Modified:02 Dec 2014 10:06

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