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  • polyamines  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Endogenous polyamine content during in vivo maturation and in vitro culture of maize pollen (1995)
    Springer
    Plant growth regulation 16 (1995), S. 19-26 
    Details
    ISSN: 1573-5087
    Keywords: microsporogenesis ; androgenesis ; polyamines ; maize pollen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Changes in polyamine content during in vivo maturation and in vitro culture of maize (Zea mays L.) pollen were studied. The endogenous content of free, conjugated and bound polyamines was analyzed during 30 days of pollen evolution, in both developmental pathways (microsporogenesis and androgenesis). The induction of androgenesis from cold-pretreated uninucleate pollen results, in most of cases, in a lower total polyamine content than that of the in vivo uninucleate pollen. These differences indicate that polyamine metabolism is altered during the induction of androgenesis, and this could be a consequence of increased polyamine assimilation. In general, pollen stages that involve cell division (tetrades, pre-anthesis pollen and four-day cultured pollen) are characterized by a predominance of free Spd. The increase of Spd and Spm in 15-day cultured pollen, when the first embryoids are formed, outline the possible implication of these polyamines in embryogenetic processes. Furthermore, these findings may contribute to the improvement of maize androgenesis yield, especially in recalcitrant genotypes, by the exogenous application of polyamines or polyamine-inhibitors to the culture medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040503
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  • 2
    Electronic Resource
    Electronic Resource
    Modulator effect of DL-α-difluoromethylarginine treatments on differentiation processes of young maize calluses (1997)
    Springer
    Plant growth regulation 21 (1997), S. 7-14 
    Details
    ISSN: 1573-5087
    Keywords: differentiation ; enzymatic activities ; maize callus ; polyamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of pretreatments with 0.5, 1, 3, 5 and 10 mM of DL-α-difluoromethylarginine (DFMA), an irreversible suicide inhibitor of the arginine decarboxylase (ADC) activity, on the differentiation process of young maize calluses was studied. Callus protein, total polyamine content and ADC activity decreased versus control in all the assayed treatments. Furthermore, ornithine decarboxylase (ODC) activity was significantly lower in the treated calluses, which was probably due to the arginase activity detected in them. Short tratments at high doses of DFMA significantly increased the number of regenerated buds versus the control (four times more in 10 mM and almost two times more in 5 mM). By contrast, long treatments at low doses (0.5, 1 and 3 mM) reduced the number of plantlets. Conjugated putrescine seems to be implicated in the regeneration response of control and high DFMA-treated calluses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005785011610
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of exogenous proline on embryogenic and organogenic maize callus subjected to salt stress (1996)
    Springer
    Plant cell, tissue and organ culture 47 (1996), S. 59-65 
    Details
    ISSN: 1573-5044
    Keywords: free amino acids ; organogenic callus ; polyamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of exogenous proline (6 mM) and increasing NaCl doses (from 0.4 to 1.2% w/v) on the maintenance of organogenic and embryogenic callus lines derived from the salt-sensitive maize inbred W64Ao2 were studied. To this end, total protein, free amino acid and polyamine content were analyzed. The demand of exogenous nitrogen and especially of proline, even in the presence of salt, differed in the two types of morphogenic calluses. The total protein content of embryogenic calluses was higher in the presence of proline than in its absence, in all the cases studied. An opposite effect of proline was observed in organogenic calluses: the presence of proline and salt decreased significantly their protein content. With respect to amino acid and polyamine contents, the organogenic calluses showed physiological characteristics of salt-adaptation, whereas the embryogenic calluses were more sensitive to NaCl. Although endogenous proline increased in the organogenic calluses cultured in the presence of salt, in embryogenic calluses it only rose at the lowest salt concentration. Furthermore, the endogenous arginine content under saline conditions was higher in organogenic calluses. A compensatory effect between proline and polyamine metabolism related to the endogenous arginine content in response to salt stress was also observed. This effect differed in the two types of calluses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02318966
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