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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of agronomic traits and analysis of exotic germ plasm polymorphism in adapted××exotic maize crosses (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 368-374 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays L.  ;  Highland tropical germ plasm  ;  Enzymatic polymorphism  ;  Forage production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The utilization of exotic germ plasm is difficult due to its non-adaptability. This study investigates the possibility of exotic germ plasm loss during adaptation, and the effect of an additional cross with elite material on the breeding value of exotic×adapted material. The study was conducted on a temperate× highland tropical composite (or pool) developed in order to broaden the genetic variability of maize in north western Europe. The frequency of unique exotic alleles and the isoenzymatic polymorphism at four loci were analysed in the pool itself, in the pool after mild selection, and in the selected pool crossed with elite material. Based on these data, no significant deviation seemed to occur during the mild selection and the cross. The pool and the pool×elite germ plasm cross were evaluated in testcrosses with two complementary testers for both grain and forage production. The pool was later in maturity, more susceptible to lodging, and yielded less than the pool×elite germ plasm crosses for all evaluations. The highest estimates of genetic variance were obtained in the pool for earliness and height traits, and for yield. However, based on the predicted genotypic mean of the selected population, the pool had a lower breeding value than the pool×elite germ plasm cross. The pool×elite germ plasm cross is thus preferred to initiate selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050137
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of agronomic traits and analysis of exotic germ plasm polymorphism in adapted x exotic maize crosses (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 368-374 
    Details
    ISSN: 1432-2242
    Keywords: Zea mays L ; Highland tropical germ plasm ; Enzymatic polymorphism ; Forage production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The utilization of exotic germ plasm is difficult due to its non-adaptability. This study investigates the possibility of exotic germ plasm loss during adaptation, and the effect of an additional cross with elite material on the breeding value of exotic x adapted material. The study was conducted on a temperate x highland tropical composite (or pool) developed in order to broaden the genetic variability of maize in north western Europe. The frequency of unique exotic alleles and the isoenzymatic polymorphism at four loci were analysed in the pool itself, in the pool after mild selection, and in the selected pool crossed with elite material. Based on these data, no significant deviation seemed to occur during the mild selection and the cross. The pool and the pool x elite germ plasm cross were evaluated in testcrosses with two complementary testers for both grain and forage production. The pool was later in maturity, more susceptible to lodging, and yielded less than the pool x elite germ plasm crosses for all evaluations. The highest estimates of genetic variance were obtained in the pool for earliness and height traits, and for yield. However, based on the predicted genotypic mean of the selected population, the pool had a lower breeding value than the pool x elite germ plasm cross. The pool x elite germ plasm cross is thus preferred to initiate selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223681
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  • 3
    Electronic Resource
    Electronic Resource
    Floral initiation in field-grown forage peas is delayed to a greater extent by short photoperiods, than in other types of European varieties (1999)
    Springer
    Euphytica 109 (1999), S. 201-211 
    Details
    ISSN: 1573-5060
    Keywords: Pisum sativum L. ; frost resistance ; floral initiation ; photoperiod ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Frost is one of the main climatic stresses which has to be overcome by a winter pea crop. Some forage lines show a delayed floral initiation, which helps them to escape the main winter freezing periods, as a higher susceptibility to frost is observed after floral initiation commences. Frost tolerant forage peas have been used in all winter pea breeding programs in France and our main purpose was to evaluate to what extent those lines and the current winter varieties are variable for the date of floral initiation in field conditions. A field experiment was carried out during two years at the INRA experimental station of Mons (northern France). Different genotypes (9 in 1995–1996 and 12 in 1996–1997) were sown at approximately monthly intervals between September and June to provide a range of photothermal conditions. The date of floral initiation was determined by destructive sampling. We observed variability for the date of floral initiation among the different genotypes and sowing dates. Our data particularly highlighted the different reactions to photoperiod. Three varieties had no detectable reaction. Six varieties exhibited a quantitative response, with varied intensities. Lastly, the three forage varieties showed a qualitative, high response to photoperiod, which indicated the presence of the Hr allele, already described in Pisum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003727324475
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