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    Wyświetlanie 1-2 z 2
    Tytuł:
    Estimation of Genetic Parameters, Heritability and Genetic Advance for Yield Related Traits in Upland Rice (Oryza sativa L. and Oryza glaberrima Steud) Genotypes in Northwestern Ethiopia
    Autorzy:
    Bitew, Jember Mulugeta
    Powiązania:
    https://bibliotekanauki.pl/articles/1192678.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Genetic advance
    Heritability
    upland Rice
    Variability
    Opis:
    This study was carried out to assess the extent of genetic variability for yield and yield related traits and to estimkate heritability and genetic advance in rainfed upland rice genotypes Twenty-two selected upland rice varieties were evaluated in randomized complete block design with three replications during 2014 cropping season. The analysis of variance showed highly significant differences (p < 0.01) for days to flowering, days to maturity, hundred seed weight, plant height and panicle length and differed significantly (p < 0.05) for fertile tiller per plant, filled grains per panicle, unfilled grains per panicle ,biomass yield and grain yield per plot except harvest index, indicating the existence of variability. The higher phenotypic and genotypic variance were obtained from number of filled grains, plant height, days for 50% heading, days for 85% maturity and biomass yield indicating high influence of the environment on the traits. The high level of genotypic and phenotypic coefficients of variation was recorded for traits like biomass yield, grain yield, number of fertile tillers per plant and unfilled grains per panicle. Heritability estimates were moderately high for days to maturity (66.01%), and thousand-grain weight (66.80%). High genetic advance as percent of means was observed for biomass yield per plot, unfilled grains per panicle, grain yield per plot, and fertile tiller per plant. Thousand-grain weight showed moderately high heritability coupled with high genetic advance as percent of mean. Therefore, selection based on this character might be effective for increasing grain yield.
    Źródło:
    World Scientific News; 2016, 47, 2; 340-350
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seeds and seedlings vigour in tropical maize inbred lines
    Autorzy:
    Adebisi, M.A.
    Kehinde, T.O.
    Porbeni, J.B.O.
    Oduwaye, O.A.
    Biliaminu, K.
    Akintunde, S.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2199724.pdf
    Data publikacji:
    2012-12-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    correlation
    genetic advance
    heritability
    seed quality
    variability
    Opis:
    Seed and seedling vigour is an aspect of seed quality which affects field establishment and performance. Low maize yields have been reported  to be affected by several factors in which poor quality seed with low seed and seedling vigour. Information is scarce on seed and seedling vigour in maize inbred lines developed for tropical environments. Fifteen genotypes of tropical maize (Zea mays L.) inbred lines were evaluated to determine the level of differences in seed and seedling vigour traits, and extent of relationships among traits and their heritability. A substantial amount of genetic variability was found, which suggested that most of the traits under study could be improved through selection and utilized in breeding programs. Positive and signifi- cant interrelationship  among  seed germination  and seedling  traits  and  a positive  correlation  between  seed germination and seed vigour and field emergence showed that these could be given due consideration in crop improvement for seed and seedling vigour. High genotypic coefficient of variation, heritability and genetic advance were obtained for seed germination, seed emergence, shoot length and seedling vigour index I and II, revealing the possibility of improvement in these characters through direct selection. The principal component analysis (PCA) identified seed emergence, shoot length, seedling vigour index I and II and tetrazolium vigour as characters that contributed greatly to variation in seed vigour in the maize inbred lines. Cluster analysis partitioned the genotypes into two groups, with group I consisting of seven genotypes and group II comprised the other eight genotypes, which suggested that hybridization between the two groups could lead to high level of heterosis. Genotype V5  had superior seedling vigour traits compared to other genotypes. Seedling emer- gence, shoot length, seedling vigour index I, seedling vigour index II and tetrazolium vigour are effective characters for good seedling vigour traits in maize inbred lines investigated.
    Źródło:
    Plant Breeding and Seed Science; 2012, 67; 87-102
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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