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  • 1
    Electronic Resource
    Electronic Resource
    A quantitative evaluation of inter-varietal hybrids of Brassica campestris L. (1976)
    Springer
    Theoretical and applied genetics 48 (1976), S. 1-8 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A quantitative evaluation of yield components was carried out in 150 inter-varietal hybrids of Brassica campestris using five each of the three varieties, brown sarson (BS) , yellow sarson (YS) and toria (TR). The results showed both additive and non-additive gene action for plant height, number of primary and secondary branches and number of siliquae on the main axis in all the six cross combinations BS-YS, YS-BS, BS-TR, TR-BS, YS-TR and TR-YS. The general combining abilities of BS, YS and TR indicated that their nature and magnitude depended largely on the other parents which entered the hybrids. There were differences in combining ability between direct and reciprocal combinations. GBS II, Kanpur Lotni 17, Kanpur Lotni 27 and DS 17D in BS, IB 3, IB 5, IB 6 and BP 12 in YS , and T 165, T 244 and T 1842 in TR were identified as potential parents for inter-varietal hybridisation. Reciprocal effects were found when BS or YS was used as parent and they were least when TR was used as a parent. The amount and degree of heterosis was substantial in inter-varietal crosses. Based on the heterosis-combining ability relationship, the role of inter-varietal hybridisation in population improvement of Brassica campestris is discussed. A number of methods of utilising the inter-varietal hybrids in multiple crosses and synthetic complexes is suggested as potential supplements to population breeding in this crop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282404
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The utility of covariance of combining ability in plant breeding (1976)
    Springer
    Theoretical and applied genetics 47 (1976), S. 303-306 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The definition of covariances of half- and full sibs, and hence that of variances of general and specific combining ability with regard to a quantitative character, is extended to take into account the respective covariances between a pair of characters. The interpretation of the dispersion and correlation matrices of general and specific combining ability is discussed by considering a set of single, three- and four-way crosses, made using diallel and line × tester mating systems in Pennisetum typhoides. The general implications of the concept of covariance of combining ability in plant breeding are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281936
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An analysis of association of components of yield and oil in safflower (Carthamus tinctorius L.) (1977)
    Springer
    Theoretical and applied genetics 50 (1977), S. 185-191 
    Details
    ISSN: 1432-2242
    Keywords: Safflower ; Carthamus tinctorius ; Oil Content ; Seed Number ; Phenotypic Correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Inter-relationships of various component characters with yield and oil content were analysed using 215 entries of safflower from India and U.S.A. Correlation of capsule number per plant and capsule weight with yield per plant was pronounced and they showed large direct effects on yield. All other components influenced seed yield mainly through these two components. Seed size had little effect on yield while seed number exerted a positive influence. The proportion of hull expressed as per cent of the whole seed revealed a highly significant and inverse relationship with oil content and was mainly responsible for the observed variability in oil content in the material. Although negative association was indicated between seed size and oil content, it was observed to be due to the indirect effect of hull content and not due to direct effect of seed size. Interestingly, yield per plant and its major components, number of capsules and capsule weight, revealed a negligible relationship with oil content. Both direct as well as indirect effects of hull percent and yield per plant were responsible for the favourable effect of seed number on oil content. The correlation of plant height, days to first flowering and total crop growth period with yield and oil content was either negligible or low, offering scope for developing early maturing and dwarf varieties with high yield and oil content. Spine index showed a non-significant association with yield and oil content. Capsule number, capsule weight and hull per cent were observed to be the most important components in breeding for higher yield and oil content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277740
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Are “multiple cross-multiple pollen hybrids’ an answer for productive populations in Brassica campestris var. ‘brown sarson’? (1979)
    Springer
    Theoretical and applied genetics 54 (1979), S. 203-207 
    Details
    ISSN: 1432-2242
    Keywords: Multiple cross ; Combining ability ; Brassica campestris ; Genetic characterisation ; Oil seed breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A set of complex crosses with multiple crosses as female parents were made using multiple pollen in turnip rape (Brassica campestris L.). These multiple cross — multiple pollen hybrids (mucromphs) were evaluated for a large number of quantitative characters including yield. New methods were proposed to study such genetic material in depth so as to formulate suitable strategies to breed for attractive seed yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267708
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  • 5
    Electronic Resource
    Electronic Resource
    A non-destructive selection criterion for fibre content in jute (1978)
    Springer
    Theoretical and applied genetics 52 (1978), S. 129-134 
    Details
    ISSN: 1432-2242
    Keywords: Selection ; Fibre ; Jute ; Estimation ; Breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A new prediction formula using a geometrical description of the jute plant is proposed and was found to predict the single plant fibre yield to a remarkable degree of accuracy. After an incisive evaluation of 20 component characters, plant height, basal and mid-diameters, basal and mid-sample fibre densities were selected to formulate the non-destructive prediction criterion. Its superiority was upheld when tested in five environments extending over a period of three years, 110 genetically distinct entries and 3080 single plants. The prospects of this criterion in reorienting the existing breeding technology and devising new ones are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264746
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  • 6
    Electronic Resource
    Electronic Resource
    Dislocation creep in particle-strengthened systems (1977)
    Springer
    Journal of materials science 12 (1977), S. 2241-2245 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A model for climb-controlled creep in two-phase materials is proposed which invokes the presence of a back-stress for providing the necessary mobile dislocations for creep. It is shown that by incorporating this stress in the creep equation it is possible to reduce both the activation energy for creep and the stress exponents to values normally observed in single-phase materials. Creep data on TD nickel and yttriated superalloy when analysed on this basis confirm the applicability of this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552246
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    Paper (German National Licenses)
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