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  • 1
    Electronic Resource
    Electronic Resource
    Heteroblasty in Arabidopsis thaliana (L.) Heynh (2000)
    Springer
    Planta 210 (2000), S. 536-542 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Arabidopsis (mutant lec1) – Cotyledon – Foliage leaf – Heteroblasty – Mutant (Arabidopsis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract.  Heteroblasty in Arabidopsis thaliana was analyzed in a variety of plants with mutations in leaf morphology using a tissue-specific β-glucuronidase gene marker. Some mutants exhibited their mutant phenotypes specifically in foliage leaves. The phenotypes associated with the foliage-leaf-specific mutations were also found to be induced ectopically in cotyledons in the presence of the lec1 mutation. Moreover, the features of an emf1lec1 double mutant showed that cotyledons can be partially converted into carpelloids. When heteroblastic traits were examined in foliage leaves in the presence of certain mutations or natural deviations by histochemical analysis of the expression of the tissue-specific marker gene, it was found that ectopic expression of the developmental program for the first foliage leaves in lec1 cotyledons seemed to affect the heteroblastic features of the first set of foliage leaves, while foliage leaves beyond the third position appeared normal. Similarly, in wild-type plants, discrepancies in heteroblastic features, relative to standard features, of foliage leaves at early positions seemed to be eliminated in foliage leaves at later positions. These results suggest that heteroblasty in foliage leaves might be affected in part by the heteroblastic stage of the preceding foliage leaves but is finally controlled autonomously at each leaf position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050042
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  • 2
    Electronic Resource
    Electronic Resource
    The cotyledon: A superior system for studies of leaf development (1994)
    Springer
    Planta 195 (1994), S. 309-312 
    Details
    ISSN: 1432-2048
    Keywords: Arabidopsis (angustifolia mutant) ; Cotyledon ; Leaf morphology ; Model leaf ; Mutant (Arabidopsis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of leaves in dicotyledonous plants is poorly understood because the division and expansion of cells occur at the same time and in the same positions. Our analysis has revealed that the growth of the cotyledons of Arabidopsis thaliana (L.) Heynh. depends only on the process of cell expansion. Thus, in this system, the roles of the expansion and division of cells in leaf development can be separated from each other. Analyzing the cotyledon, as a model leaf, we determined that a narrow-leaved mutant of Arabidopsis, angustifolia (an), has a defect in the polarity of the cell-expansion process. The defect was only manifested as the reduced width of blades of cotyledons, an observation which indicates that the direction of expansion of cotyledons is controlled by at least two genetically distinct pathways, one of which is regulated by the Angustifolia gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199692
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  • 3
    Electronic Resource
    Electronic Resource
    The CURLY LEAF gene controls both division and elongation of cells during the expansion of the leaf blade in Arabidopsis thaliana (1998)
    Springer
    Planta 206 (1998), S. 175-183 
    Details
    ISSN: 1432-2048
    Keywords: Key words:Arabidopsis (leaf morphogenesis) ; Cell division ; Cell elongation ; CURLY LEAF ; Leaf blade expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The CURLY LEAF (CLF ) gene in Arabidopsis thaliana (L.) Heynh. is required for stable repression of a floral homeotic gene, AGAMOUS in leaves and stems To clarify the function of CLF in organ development, we characterized clf mutants using an anatomical and genetic approach. The clf mutants had normal roots, hypocotyls, and cotyledons, but the foliage leaves and the stems had reduced dimensions. A decrease both in the extent of cell elongation and in the number of cells was evident in the clf mutant leaves, suggesting that the CLF gene might be involved in the division and elongation of cells during leaf morphogenesis. An analysis of the development of clf mutant leaves revealed that the period during which cell division or cell elongation occurred was of normal duration, while the rates of both cell production and cell elongation were lower than in the wild type. Two phases in the elongation of cells were also recognized from this analysis. From analysis of an angustifolia clf double mutant, we found that the two phases of elongation of leaf cells were regulated independently by each gene. Thus, the CLF gene appears to affect cell division at an earlier stage and cell elongation throughout the development of leaf primordia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050389
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  • 4
    Electronic Resource
    Electronic Resource
    Floral organ-specific and constitutive expression of an Arabidopsis thaliana heat-shock HSP18.2:: GUS fusion gene is retained even after homeotic conversion of flowers by mutation (1993)
    Springer
    Molecular genetics and genomics 237 (1993), S. 26-32 
    Details
    ISSN: 1617-4623
    Keywords: Floral organ ; HSP ; Arabidopsis thaliana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Organ-specific and constitutive expression of the Arabidosis HSP18.2 gene under normal growth conditions (22° C) was observed in transgenic A. thaliana, which carried a fusion gene composed of the promoter region of HSP18.2, one of the genes for low molecular weight heat-shock proteins in Arabidopsis, and the gene for β-glucuronidase (GUS) from Escherichia coli. In order to clarify the organ-specific nature of promoter expression, various mutations that affect flower morphology were introduced into the transgenic Arabidopsis line, AHS9. The results show that the pattern of expression observed in sepals, filaments, and styles is regulated in a structure-dependent manner, and suggest that the HSP18.2 gene might have an important role in the process of differentiation of flower buds, as do several other stress-related genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282780
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization and subcellular localization of a small GTP-binding protein (Ara-4) fromArabidopsis: conditional expression under control of the promoter of the gene for heat-shock protein HSP81-1 (1996)
    Springer
    Molecular genetics and genomics 250 (1996), S. 533-539 
    Details
    ISSN: 1617-4623
    Keywords: rab/YPT ; Arabidopsis thaliana ; Intracellular transport ; Heat shock protein ; Transgenic plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Small GTP-binding proteins belonging to the rab/YPT family play key roles at various steps in intracellular transport pathways in yeast and mammalian cells. Many members of rab/YPT family have been isolated from plants to date. However, detailed information about the localization and function of the gene products remains limited, even though intracellular transport is likely to be involved in important phenomena such as cell elongation, transport of storage proteins, determination and maintenance of cell polarity and intercellular signal transduction. We have attempted to establish transgenicArabidopsis plants that overexpressARA-4, a rab/YPT homologue in order to analyze the function and the localization of the gene product. For overexpression and also for regulation of the expression of this gene, the promoter of the gene for HSP81-1 was employed to drive the transcription ofARA-4 in transgenic plants. The response of the introduced genes to heat shock was analyzed. Upon heat-shock treatment, theARA-4 gene was efficiently transcribed and translated. The induction ofARA-4 by heat shock was transient, and at least two distinct forms of this protein were found in membrane and cytosolic fractions from transgenic plants. Prolonged incubation after heat shock reduced the amount of the cytosolic form of the induced protein, and the cytosolic form of the protein thus probably represents the unprocessed precursor. Using transgenic plants, we determined the subcellular localization of the product ofARA-4. The protein was predominantly localized on Golgi-derived vesicles, Golgi cisternae and the trans-Golgi network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02174441
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  • 6
    Electronic Resource
    Electronic Resource
    Developmental genetics of leaf morphogenesis in dicotyledonous plants (1995)
    Springer
    Journal of plant research 108 (1995), S. 407-416 
    Details
    ISSN: 1618-0860
    Keywords: Arabidopsis ; Developmental genetics ; Dicots ; Leaf ; Morphogenesis ; Mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A full understanding of the leaf is essential for a full understanding of plant morphology. However, leaf morphogenesis is still poorly understood, in particular in dicotyledonous plants, because of the complex nature of the development of leaves. Mutational analysis seems to be the most suitable strategy for investigations of such processes, and should allow us to dissect the developmental pathways into genetically programmed unit processes. The techniques of developmental genetics have been applied to the study of leaf morphogenesis in model plants, such asArabidopsis thaliana, and several key processes in leaf morphogenesis have been identified. The fundamental processes in leaf morphogenesis include the identification of leaf organs, determination of leaf primordia (occurrence of marginal meristem), and the polar or non-polar elongation of leaf cells. This review will focus on the genes that are essential for these processes and have been identified in mutational analyses. Mutational analyses of the photomorphogenesis is also briefly summarized from the perspective of the plasticity of leaf morphogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344229
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  • 7
    Electronic Resource
    Electronic Resource
    The Role of Meristematic Activities in the Formation of Leaf Blades (2000)
    Springer
    Journal of plant research 113 (2000), S. 119-126 
    Details
    ISSN: 1618-0860
    Keywords: Keywords: Arabidopsis thaliana, Indeterminate leaf, Leaf morphogenesis, Meristem, Shoot apical meristem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Arabidopsis thaliana (L.) Heynh. Leaf primordia also have their own meristematic regions and meristematic activity is maintained in part of the leaf blade, in some case, even after maturation. Transgenic plants have been generated that have proved to be useful tools in the analysis of the behavior of meristematic regions in leaf blades of A. thaliana. This review, based on our present understanding of molecular mechanisms for the maintenance and development of shoot apical meristems in A. thaliana, summarizes the variations in patterns and functions of meristematic regions in leaf blades focusing, in particular, on the case of indeterminate leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013921
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  • 8
    Electronic Resource
    Electronic Resource
    Spiranthes sinensis var.amoena in Japan contains two seasonally differentiated groups (1994)
    Springer
    Journal of plant research 107 (1994), S. 187-190 
    Details
    ISSN: 1618-0860
    Keywords: Japan ; Orchidaceae ; Seasonal isolation ; Spiranthes sinensis ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Specimens ofSpiranthes sinensis var.amoena in four Harbaria in Japan and living materials from four localities were examined for the flowering time. As a result, two distinct types, flowering in spring and autumn respectively, are recognized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346016
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization and subcellular localization of a small GTP-binding protein (Ara-4) from Arabidopsis: conditional expression under control of the promoter of the gene for heat-shock protein HSP81-1 (1996)
    Springer
    Molecular genetics and genomics 250 (1996), S. 533-539 
    Details
    ISSN: 1617-4623
    Keywords: Key words rab/YPT ; Arabidopsis thaliana ; Intracellular transport ; Heat shock protein ; Transgenic plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Small GTP-binding proteins belonging to the rab/YPT family play key roles at various steps in intracellular transport pathways in yeast and mammalian cells. Many members of rab/YPT family have been isolated from plants to date. However, detailed information about the localization and function of the gene products remains limited, even though intracellular transport is likely to be involved in important phenomena such as cell elongation, transport of storage proteins, determination and maintenance of cell polarity and intercellular signal transduction. We have attempted to establish transgenic Arabidopsis plants that overexpress ARA-4, a rab/YPT homologue in order to analyze the function and the localization of the gene product. For overexpression and also for regulation of the expression of this gene, the promoter of the gene for HSP81-1 was employed to drive the transcription of ARA-4 in transgenic plants. The response of the introduced genes to heat shock was analyzed. Upon heat-shock treatment, the ARA-4 gene was efficiently transcribed and translated. The induction of ARA-4 by heat shock was transient, and at least two distinct forms of this protein were found in membrane and cytosolic fractions from transgenic plants. Prolonged incubation after heat shock reduced the amount of the cytosolic form of the induced protein, and the cytosolic form of the protein thus probably represents the unprocessed precursor. Using transgenic plants, we determined the subcellular localization of the product of ARA-4. The protein was predominantly localized on Golgi-derived vesicles, Golgi cisternae and the trans-Golgi network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02174441
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  • 10
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    Leaf shape diversity with an emphasis on leaf contour variation, developmental background, and adaptation (2018)
    Elsevier
    Details
    Publication Date: 2018-07-01
    Print ISSN: 1084-9521
    Electronic ISSN: 1096-3634
    Topics: Biology , Medicine
    Published by Elsevier
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