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  • 1
    Electronic Resource
    Electronic Resource
    Hybridization barriers among the species of Arachis L., namely of the sections Arachis (including the groundnut) and Erectoides (1998)
    Springer
    Genetic resources and crop evolution 45 (1998), S. 41-45 
    Details
    ISSN: 1573-5109
    Keywords: Arachis ; crossability barriers ; early leaf spot disease ; endosperm ; Erectoides ; ovules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Some members of section Erectoides have been found resistant to early leaf spot disease, a serious constraint to groundnut productivity. These accessions do not cross with cultivated species. Crossing between one such diploid species, A. paraguariensis (ICGs 8130 and 8973) of section Erectoides, and the diploids, A. batizocoi and A. duranensis, and the tetraploid A. hypogaea (groundnut) of section Arachis has helped understand barriers to hybridization between sections. These crosses result in the development of normal pegs and pods, but with of ovule and embryo development restricted or non-existent. Such restricted growth and embryo abortion is found to be due to cessation of early endosperm development in A. duranensis (2x) times A. paraguariensis (2x), the non-development of endosperm beyond the coenocytic stage in A. batizocoi (2x) times A. paraguariensis (2x), and the overgrowth of nucellar tissue into the embryo sac in case of A. hypogaea (4x) times A. paraguariensis (2x). The weak cross-compatibility between the species of two sections suggest relatively closer phylogenetic relationship between them, than with the other incompatible sections of the genus Arachis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008681020851
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  • 2
    Electronic Resource
    Electronic Resource
    The genome donors of the groundnut/peanut (Arachis hypogaea L.) revisited (1998)
    Springer
    Genetic resources and crop evolution 45 (1998), S. 113-116 
    Details
    ISSN: 1573-5109
    Keywords: Arachis hypogaea ; A. duranensis ; A. batizocoi ; A. ipaensis ; cytogenetic ; molecular
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Arachis hypogaea, the cultivated groundnut is a tetraploid with an AABB genomic constitution. The available literature on the origin of groundnut reveals that there is general agreement that the cultivated groundnut has evolved from the wild tetraploid species A. monticola, with which it crosses freely to produce fertile hybrids. However, the issue of actual diploid ancestors of A. monticola is still unresolved. Both cytogenetic and molecular evidences support A. duranensis being the most probable progenitor and donor of the A genome to A. hypogaea. For the B genome, the cytogenetic evidence suggests A. batizocoi to be the most probable progenitor, but the RFLP banding pattern indicates that A. batizocoi is more distantly related to A. hypogaea than other species of section Arachis. RFLP banding pattern indicates A. ipaensis to be one of the closest species to A. hypogaea and the possible donor of the B genome. The present article critically analyzes the available data, which suggests that until an amphidiploid is produced synthetically between A. duranensis × A. ipaensis and crossed successfully with A. hypogaea to produce a fertile hybrid, this issue would remain unresolved. A. batizocoi would remain the most probable donor of the B genome because of its directly demonstrable cytogenetic affinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008640631719
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic variation vis-à-vis molecular polymorphism in groundnut, Arachis hypogaea L. (1998)
    Springer
    Genetic resources and crop evolution 45 (1998), S. 119-126 
    Details
    ISSN: 1573-5109
    Keywords: Arachis hypogaea ; DNA markers ; molecular polymorphism ; variation ; origin ; evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Recent studies on the genus Arachis using molecular markers have revealed very little demonstrable polymorphism in the cultivated groundnut, A. hypogaea. This has led to the hasty generalization that the groundnut lacks genetic variation. However, this is in complete contradiction to the results of other lines of investigations into the origin and evolution of A. hypogaea. Further, a characterization of the world collection for various traits also shows significant levels of variation for almost all genetic traits. The literature review in this article suggests that the lack of genetic variation was inferred because of an inadequacy in the material studied, and the range of techniques used to study molecular polymorphism. A comprehensive and rigorous examination of the material available in the groundnut world collection, either by improving current techniques, or by using such advanced techniques as SSRs and AFLP could well reveal polymorphism at the molecular level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008646422730
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    Paper (German National Licenses)
    Fulltext
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