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  • Inheritance  (3)
  • Sporulation frequency  (2)
  • 85.30  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 29 (1999), S. 424-429 
    ISSN: 1432-0789
    Keywords: Key words Azolla species ; Gibberellic acid ; Megasporocarp percentage ; Sporocarp number ; Sporulation frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Azolla microphylla strains used in the study sporulate throughout the year while Azolla caroliniana and Azolla pinnata strains show sporulation only during November–March, the favourable period for sporulation. Application of gibberellic acid (GA) at a concentration of 2.5–100.0 μg ml–1 substantially enhanced the sporulation frequency and number of sporocarps (mega plus micro) per plant in Azolla microphylla (two strains) during the unfavourable period (September–October) by 77.3–200.0%. The increase in the number of microsporocarps was more than that of the megasporocarps. The sporulation frequency and number of sporocarps in Azolla pinnata (two strains) and Azolla caroliniana during the favourable season also increased considerably due to GA (2.5–10.0 μg ml–1) application. The optimum GA concentration for the sporulation of the three Azolla species was 2.5 μg ml–1, which was used in the subsequent investigations. Efficacy of GA for enhancing sporulation was tested across 20 Azolla pinnata strains. A significant positive response was observed in all the strains. Of them, 17 strains for the sporulation frequency and 15 strains for the sporocarp number showed a 〉25% increase due to GA treatment. Under field conditions, Azolla microphylla (two strains), Azolla caroliniana and Azolla pinnata exhibited 66.0–88.1% higher sporulation frequency and 42.8–52.6% higher sporocarp number due to GA application. However, the proportion of megasporocarps to total sporocarps did not change.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 32 (2000), S. 458-462 
    ISSN: 1432-0789
    Keywords: KeywordsAzolla genotypes ; Megasporocarp percentage ; Phosphorus fertilization ; Sporocarp number ; Sporulation frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Phosphorus application decreased the sporulation frequency and number of sporocarps per plant in all the three Azolla species and 21 A. pinnata strains evaluated in this study. The number of megasporocarps tended to be more depressed than the number of microsporocarps. Nevertheless, the sporulation of A. caroliniana was less sensitive to P than that of A. pinnata and A. microphylla. Its sporulation frequency in the mineral medium did not decrease at 2.5 μg P ml–1 and remained unaffected between 5 and 20 μg P ml–1. The sporulation frequency and sporocarp number in this species in the soil culture also were not significantly affected by an increase in the dose of P from 10.7 to 21.4 or 21.4 to 32.1 mg pot–1. Large variations in the degree of inhibition of sporulation due to the application of P (21.4 mg pot–1) also occurred among the A. pinnata strains tested.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 56 (1993), S. 335-341 
    ISSN: 1432-0630
    Keywords: 72.40 ; 85.30 ; 85.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of signal-modulated optical radiation on the characteristics of a GaAlAs/GaAs MODFET has been studied analytically. It is found that the offset voltage increases with modulation frequency and the effect of frequency is negligible above 5 MHz. The drain-source current decreases with increase in signal frequency at a constant radiation flux density, doping concentration and drain-source voltage. Studies on sheet concentration and transconductance also show that the signal frequency has a significant effect upto a certain modulation frequency (≲5 MHz) above which the effect of frequency is insignificant.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 70 (1985), S. 337-337 
    ISSN: 1432-2242
    Keywords: Blackgram ; Vigna mungo ; Plant type ; Mutant ; Gene symbol ; EMS ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The inheritance of the dwarf plant type was studied in blackgram (V. mungo (L.) Hepper). ‘Type 9’ has erect plant type with normal internode length. The mutant line, ‘EMSD’ has reduced internode length. The F1, F2 and F3 generations of a cross between ‘Type 9’ and ‘EMSD’ and its reciprocal were studied. The extreme dwarf plant type appeared to be governed by a single recessive gene, dw 1 dw 1 with no cytoplasmic effect.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 90 (1995), S. 63-64 
    ISSN: 1432-2242
    Keywords: Peas ; Pisum sativum ; Male sterility ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A plant with a mutant phenotype was observed in a ‘Longittee’ cultivar. The plant was late in maturity, had white-translucent anthers, and was male sterile. The inheritance of this mutant was studied in a cross involving the mutant and the mother parent and their F1, F2, F3 and BC1F1 generations. The results suggested that the sterile character was genetic and due to a recessive gene.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 94 (1997), S. 1102-1103 
    ISSN: 1432-2242
    Keywords: Key words Pigeonpea ; Cajanus cajan ; Male sterility ; Inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A male-sterile plant was observed in the UPAS-120 cultivar of pigeonpea (Cajanus cajan). The plant was about 5–7 days late-flowering and had white translucent anthers with complete pollen sterility. The inheritance of this spontaneous male sterility was studied in a cross involving the mutant and fertile UPAS-120, including their F1, F2, BC1F1 and BC2F1 generations. The results suggested that the male sterility was genetic and due to a recessive gene.
    Type of Medium: Electronic Resource
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