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  • 1975-1979  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Histological studies on the effects of benzoylprop ethyl and flamprop methyl on growth and development of wild oats (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 19 (1979), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Wild oats were trealed with benzoylprop eihyl and flamprop methyl alone or in combination with other herbicides and the effects on plant growth studied using histological techniques, Benzoylprop ethyl caused severe reductions in the growth of both the leaves and internodes of treated plants, Evidence was obtained which indieaies that cell division as well as cell elongalion was inhibited. The effects of flamprop methyl on plant growth were similar lo those observed for benzoylprop ethyl. Both compounds interfered with normal differentiation of vascular tissues which could account for retarded development of the higher internodes and shoot apex of treated plants. Of the various herbicides applied in combination with the wild oat herbicides, 2,4—D was more antagonistic than MCPA. while bromoxynil was the least antagonistic. Plants treated with benzoylprop ethyl plus 2.4—D had increased cell, leaf and internode lengths compared to plants treated with benzoylprop ethyl alone. Reductions in cell and internode lengths of plants treated with the herbicide combinations were not always proportional lo dry weight reductions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1979.tb01555.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Histochemistry and fine structure of developing wheat aleurone cells (1975)
    Springer
    Planta 123 (1975), S. 105-116 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Developing aleurone cells can first be distinguished 10 days after anthesis beneath the degenerating nucellus as somewhat cuboidal cells with extremely thin walls and large nuclei. Ribosomes are very abundant but little endoplasmic reticulum (ER) is apparent. By 14 days the cell walls are intensely autofluorescent, possibly due to the presence of a ferulic acid-carbohydrate complex. At this stage the cytoplasm is characterized by the presence of large vacuoles, many of which contain small, electron-dense inclusions, presumably the beginnings of the phytin globoids (Type I inclusions) of mature aleurone grains. The paired appearance of many of the cells suggests that they are dividing periclinally, the innermost cells destined to become part of the starchy endosperm. By 4 weeks the cell walls have greatly thickened, ER and mitochondria have proliferated, and the vacuoles, which subsequently give rise to mature aleurone grains, contain a second type of inclusion (Type II inclusion) embedded in a protein matrix. Although the walls remain uniformly autofluorescent, an intensely stained inner wall can be distinguished readily from the outer wall. By 5 weeks the aleurone grains are almost completely surrounded by lipid droplets and contain numerous Type I inclusions. The cells change little in appearance from 6 weeks to maturity. At the latter stage the inner and outer walls are quite distinct and the cytoplasm is densely packed with aleurone grains which are completely surrounded by lipid droplets and interspersed with occasional plastids and numerous mitochondria with rather indistinct cristae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383859
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Initital cellularization and differentiation of the aleurone cells in the ventral region of the developing wheat grain (1978)
    Springer
    Planta 140 (1978), S. 19-30 
    Details
    ISSN: 1432-2048
    Keywords: Aleurone ; Endosperm ; Triticum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Early cellularization of the free-nuclear endosperm and subsequent differentation of the aleurone cells in the ventral region of the developing wheatgrain (Triticumaestivum L. cv. Heron) were examined using both light and electron microscopy. In ovules harvested 1 d after anthesis, irregular wall ingroths typical of transfer cells protrude into the multinucleate cytoplasm. Initital cellularization occurs by a process of free wall formation in much the same fashion as in the dorsal region of the grain. In places, sheets of endoplasmic reticulum and dictyosomes appear to be closely associated with the growing wall. Like the wall ingrowths noted earlier, the freely growing walls are intensely fluorescent after staining with aniline blue. Initiatal cellularization is complete 2–3 days after anthesis. Unlike the first-formed cells in the dorsal region of the developing grain, those in the ventral region are not meristematic. These amitotic cells become the groove aleurone cells which at an early stage of development are set apart from the rest of the endosperm by their irregularly thickened walls and dense cytoplasm. Autofluorescence is first apparent in the walls of those cells next to the degenerating nucellus. In contrast to the aleurone cells in the dorsal region of the grain, at maturity only the inner wall layer of each of the groove aleurone cells remains autofluorescent. The aleurone grains are highly variable in appearance and contain no Type II inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389375
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cytokinesis in the developing wheat grain; Division with and without a phragmoplast (1976)
    Springer
    Planta 130 (1976), S. 57-67 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cell wall formation during the transition from free-nuclear to cellular endosperm of wheat (Triticum aestivum L. cv. Heron) was investigated using correlated light and electron microscopy. Partitioning of the multinucleate syncytium that lines the inner periphery of the embryo sac is initiated 1–2 days after anthesis. Wall ingrowths, at first recognizable in sections as minute wall pegs, furrow inward from the edge of the embryo sac through the vacuolate cytoplasm which, to the inside, is clearly delimited by the central vacuole. Growth of the walls at this stage is independent of a phragmoplast and in this respect is reminiscent of the cleavage processes of lower plant cells. Intense fluorescence of the walls after staining with aniline blue suggests that callose may be a principal component. The growing walls branch and eventually meet on the side nearest the central vacuole. Cellularization of the peripheral layer of endosperm cytoplasm is thus complete about 2 days after anthesis. Between 2 and 3 days after anthesis, the peripheral layer of cells commences to divide both radially and tangentially and by 4 days the entire embryo sac is cellular. Cytokinesis during this phase entails the formation of a cell plate between sister nuclei. At the periphery of a forming cell plate, “vesicles” appear scattered amongst an array of phragmoplast microtubules. This mechanism of wall growth differs markedly from the initial infurrowing of the first-formed walls. The overall timing and the manner of cell wall deposition vary in a number of important respects from the model recently proposed by Mares et al. whose work was based largely on light microscopy (D.J. Mares; K. Norstog; A.B. Stone: Aust. J. Bot. 23, 311–326, 1975).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390845
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    Paper (German National Licenses)
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