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  • Articles  (5)
  • rice
  • 1985-1989  (5)
  • 1965-1969
  • 1985  (5)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (5)
  • Economics
  • Geosciences
  • Energy, Environment Protection, Nuclear Power Engineering
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  • Articles  (5)
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Keywords
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  • 1985-1989  (5)
  • 1965-1969
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Topic
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (5)
  • Economics
  • Geosciences
  • Energy, Environment Protection, Nuclear Power Engineering
  • Biology  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Cytological observations in some hybrids between the rice species Oryza sativa L. and O. glaberrima Steud. (1985)
    Springer
    Euphytica 34 (1985), S. 75-81 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; Oryza glaberrima ; African rice ; interspecific hybrids ; hybrid sterility ; male sterility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several hybrids between Oryza sativa and O. glaberrima and their backcrosses with O. sativa were studied. Their seed sterility was very different; large differences were also observed in the level of pollen sterility and in the earliness of microspore failure. The proportion of aborted embryo sacs was much lower than the rate of sterile male gametophytes. The backcross populations were much more sterile than the corresponding F1 hybrids. On the base of our observations and according to the literature, we may conclude that genic unbalance is the main cause of sterility of these hybrids, but that physiological factors may also be involved. Thus a restoration of fertility is generally possible by selection. On the other hand, male-sterile lines could be bred from some of these hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022865
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  • 2
    Electronic Resource
    Electronic Resource
    Inheritance studies of characters associated with floating habit and their linkage relationship in rice (1985)
    Springer
    Euphytica 34 (1985), S. 875-881 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; floating habit ; genetics ; linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Deep water rice varieties in general have certain peculiar characters which are associated with floating habit. These characters are (i) early nodal differentiation, (ii) nodal rooting, (iii) spreading habit, (iv) awned grains, (v) brown hull colour, (vi) red pericarp (red rice), and (vii) seed dormancy. Inheritance of these characters and linkage relationship of genes governing these characters were studied in a cross between Pankaj (non floating) and Nageribao (floating) rice varieties. Nageribao, a cultivar from Assam possesses these characters. Early nodal differentiation was observed to be controlled by a single dominant gene, designated as ‘Nd’. Nodal rooting was controlled by two dominant complementary genes, designated as ‘Nr 1’ and ‘Nr 2’. We found an inhibitory factor for spreading habit and one for brown hull colour in Pankaj; the operation of two dominant duplicate genes ‘An 1’ and ‘An 2’ for controlling awning characters, a single dominant gene ‘Rd’ for red pericarp colour and a single dominant gene ‘Gd’ for grain dormancy. Joint segregations between these characters resulted in the assignment of genes in the X linkage group of indica rices with estimated map distances based on the cross-over values. The genes ‘An’ (awning), ‘Es’ (spreading habit), ‘Nr’ (nodal rooting) and ‘Nd’ (nodal differentiation) were observed to be associated with each other. The gene for red pericarp (Rd) was observed to be linked with the grain dormaney gene ‘Gd’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035427
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  • 3
    Electronic Resource
    Electronic Resource
    Interspecific cytoplasm substitutions of an Indica strain of Oryza sativa L. and O. Glaberrima Steud (1985)
    Springer
    Euphytica 34 (1985), S. 587-592 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; Oryza glaberrima ; African rice ; cytoplasmic male sterility ; anther dehiscence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary To study differential nucleus-cytoplasm interactions between the two cultivated rice species, Oryza sativa and O. glaberrima, cytoplasmic substitution lines were made by using a glaberrima strain (G) and an Indica strain of sativa (S). The G cytoplasm had no adverse effect on pollen development when combined with the nucleus of S. On the other hand, when the S cytoplasm was combined with the G nucleus, the substitution line showed no seed set because of male sterility although the pollen grains were normally stained with I2-KI solution. A dominant gene derived from S strain seemed to cause anther indehiscence in the substitution line. Further, a restorer gene (Rf j)from Akebono of Japonica type was effective on pollen restoration in the male sterile line, suggesting that the S cytoplasm is the same as those of Japonica type in terms of a fertility-restoring system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035393
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  • 4
    Electronic Resource
    Electronic Resource
    Root pulling resistance in rice: Inheritance and association with drought tolerance (1985)
    Springer
    Euphytica 34 (1985), S. 905-913 
    Details
    ISSN: 1573-5060
    Keywords: Orvza sativa L. ; rice ; drought tolerance ; genetics ; leaf water potential ; root pulling resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Avoidance of drought stress is commonly associated with root system characteristics and root development. The inheritance of root pulling resistance in rice (Oryza sativa L.) was investigated and its relationship with visual field scores for drought tolerance was studied. Transgressive segregation for high root pulling resistance was observed in 3 crosses (high x high, low x high, and intermediate x intermediate). Both dominant and additive genes control the variation. F1 superiority for high root pulling resistance was observed and could be exploited in an F1 hybrid breeding program. F2 distribution curves indicated that plants highly resistant to root pulling can be obtained not only from low x high and high x high crosses, but also from intermediate x intermediate crosses. Root pulling resistance in rice has a low heritability (39 to 47%). Thus, breeding for a high root pulling resistance may best be accomplished by selection based on line means rather than individual plant selection. Field screening showed significant differences in leaf water potential among random F3 lines. F3 lines with higher leaf water potential had better visual scores for drought tolerance. Visual drought tolerance scores were correlated with root pulling resistance. Plants with high root pulling resistance had the ability to maintain higher leaf water potentials under severe drought stress. The usefulness of the root pulling technique in selecting drought tolerant genotypes was confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035430
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  • 5
    Electronic Resource
    Electronic Resource
    Induction and selection of mutations for resistance against bacterial leaf blight in rice (1985)
    Springer
    Euphytica 34 (1985), S. 577-585 
    Details
    ISSN: 1573-5060
    Keywords: Oryzasativa L. ; rice ; Xanthomonas campestris pv. ; oryzae ; bacterial leaf blight ; resistance ; induced mutations ; seleetion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dry seed lots of a rice cultivar, Harebare, susceptible for bacterial leaf blight (BLB), were exposed to thermal neutrons with and without pre-treatment of seed for boron-enrichment, and to gamma-rays. M1 plants of each of the treatments were grown and their seeds were separately harvested. M2 populations were raised in rice fields of a farmer in a region where BLB is epidemic every year, and M2 and control plants which expressed resistant reactions to BLB were selected. M3 and control lines as plant progenies of the selected M2 plants were raised in the same rice fields as in M2 generation in order to investigate their BLB resistance and other agronomically important traits. Variances for disease severity of M2 populations were significantly larger than those of the control population. whereas their means were not singificantly different from that of the control population, suggesting induction of mutations toward both resistance and susceptibility to BLB. Mean disease severity values of the M3 lines from selected M2 plants were significantly smaller than those of the control lines, indicating gains of selection in M2 for quantitative resistance against BLB. Thermal neutrons, especially with boron-enrichment pre-treatment were effective to induce mutations for resistance against BLB. Some M3 mutant lines with quantitatively enhanced resistance against BLB were not modified in other agronomic traits from those of the original cultivar. Significance of the induced quantitative resistance in breeding programmes for BLB resistance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035392
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