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  • 1
    Electronic Resource
    Electronic Resource
    Genetic and physiological relationships in N, P and K mobilisation in some sorghum mutants and parents (1985)
    Springer
    Theoretical and applied genetics 69 (1985), S. 353-359 
    Details
    ISSN: 1432-2242
    Keywords: Sorghum mutants ; Flag leaf ; Rachis ; N.P.K. partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mutation breeding program of alteration in plant type in two local Sorghum varieties resulted in several productive mutants of which 16 are far superior to the parents CRP, CBA and recommended hybrids. An earlier analysis of leaf area and photosynthetic efficiency revealed a diversity of mechanisms between mutants of the same yield group. Differences in the transfer of nutrients from leaf to the panicle were also indicated. Further analysis of the partition of nutrients in the panicle, flag leaf and rachis for N, P and K revealed that most of the mutants are at least equal to the parent in grain N but are superior in N content of flag leaf and rachis. Similarly, three mutants had a higher P content in grain than CRP and all other mutants were equal to CRP. Two mutants had more P in the flag leaf but this was not reflected in the grain. However, no differences were observed for the K content in the flag leaf, grain and rachis. The interrelations of the nutrients in different plant parts suggest that each mutant has a different pattern of nutrient accumulation and transfer. It could be concluded that selection for flag leaf N and P can improve grain N and P. There was no negative association between N and P accumulation in different plant parts. No adverse association was observed for other combinations. A study on the grain digestability of the mutants confirmed that the quality of the protein was not adversely affected in this material. This study indicated that simultaneous improvement of grain yield and grain N, P and K can be obtained even among the few mutants generated in this breeding program contrary to the belief of some cereal breeders that grain yield and its N content have a major negative association limiting the improvement of yield and protein content simultaneously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570901
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  • 2
    Electronic Resource
    Electronic Resource
    Thermochemical and theoretical study of some methyldiazines (1996)
    Springer
    Structural chemistry 7 (1996), S. 329-336 
    Details
    ISSN: 1572-9001
    Keywords: Methylpyrazines ; enthalpies of formation ; RHF calculations ; DFT calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The standard (p 0 = 0.1 MPa) molar enthalpies of formation for the liquid 2,3-dimethylpyrazine and trimethylpyrazine and the crystalline 2,3-dimethylquinoxaline and tetramethylpyrazine were derived from the standard molar enthalpies of combustion, in oxygen, atT=298.15 K, measured by static-bomb combustion calorimetry. The standard molar enthalpies of vaporization or of sublimation for the same compounds were determined by Calvet microcalorimetry. Ab initio full geometry optimization at the 3-21G and 6-31G* levels were also performed for all the methylpyrazine isomers. MP2/RHF/3-21G//3-21G and DFT energies were also calculated for all the methylpyrazine isomers, thus allowing us to estimate their isodesmic resonance energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02275159
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Drought on Photosynthetic Performance and Water Relations of Four Vigna Genotypes (1999)
    Springer
    Photosynthetica 36 (1999), S. 79-87 
    Details
    ISSN: 1573-9058
    Keywords: drought ; gas exchanges ; water relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of drought on plant water relations and photosynthesis of Vigna glabrescens (Vg) and Vigna unguiculata (cvs. 1183, EPACE-1 and Lagoa), which differ in their drought resistance, was compared. With the increase of drought severity, Vg showed a more gradual stomatal closure and maintained significantly higher levels of stomatal conductance (gs) and photosynthetic activity (PN) than the other genotypes even when minimum relative water content (RWC) values were observed. Furthermore, Vg was the only genotype able to accumulate significant amounts of proline already under moderate water deficit, what could explain the lower osmotic potential (ψs) values observed in these plants. The three V. unguiculata cultivars presented a similar stomatal control under increasing water deficit. A mesophyllic impairment of photosynthetic capacity (Pmax) was detected for cv. 1183 from the beginning of drought onset (85-75 % RWC) while in the Vg plants the values remained unaffected along the whole drought period, indicating that PN decrease observed in this genotype is mainly a consequence of stomatal closure. Such Pmax maintenance suggests the existence of a high mesophyllic ability to cope with increasing tissue dehydration in Vg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007018804086
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