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  • 1
    Electronic Resource
    Electronic Resource
    Relationship between inbreeding depression and inbreeding coefficient in maritime pine (Pinus pinaster) (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 347-356 
    Details
    ISSN: 1432-2242
    Keywords: Pinus pinaster ; Inbreeding depression ; Filled seeds ; Adult growth ; Genetic load
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between inbreeding depression and inbreeding coefficient (F) for several important traits was investigated in an 11-year trial of maritime pine (Pinus pinaster). Five levels of inbreeding (F=0; 0.125; 0.25; 0.5; 0.75) were obtained in a mating design involving ten plus-trees, or their progenies, as parents (total of 51 families). For F=0.75, the mean inbreeding depressions were 27% for height, 37% for circumference at breast height (63% for bole volume), 23% for basal straightness (better straightness of the inbred trees), and 89% for female fertility (number of cones). Large differences were observed among inbred families for the same level of inbreeding. The evolution of depression with F was more or less linear, depending on the traits. Significant differences among F-levels appeared very early for height (from 5-years of age). Inbreeding depression was much more expressed during unfavorable years than during favorable years for yearly height growth. When compared with other Pinus species, maritime pine appears to be less affected by inbreeding, especially for the percentage of filled seeds and general vigor. A reduced genetic load in maritime pine may result from the evolutionary history of the species and its scattered distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223678
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of chilling sensitivity in different rice varieties. Relationship between screening procedures applied during germination and vegetative growth (1996)
    Springer
    Euphytica 89 (1996), S. 201-210 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; chilling ; electrolyte leakage ; chlorophyll fluorescence ; seed dormancy ; seed germination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rice varieties were screened for chilling tolerance during germination and vegetative growth using different techniques. The effects of temperature during germination were investigated from 10 to 25°C. The screening was most effective at 10°C. Time of data collection has to be considered in order to discriminate slow germinating from chilling sensitive varieties. Chilling survival tests (10°C) applied at the 2-leaf stage revealed that different chilling durations brought complementary results: the longer treatments allowed to identify the most tolerant varieties, while shorter treatments allowed to distinguish intermediate from most sensitive rices. Results of chilling tests applied at the 2- and the 8-leaf stages showed a high correlation. Low-temperature electrolyte leakage and low-temperature fluorescence were also highly correlated to each other and to survival tests applied at the same development stage. By contrast, weak correlations were observed between low-temperature germination and plantlet chilling survival. It is concluded that low-temperature electrolyte leakage and low-temperature fluorescence are good indicators of chilling tolerance during the vegetative growth. The possibility to use a chilling screening procedure applied at this stage in order to predict the chilling tolerance at other development stages is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034606
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