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  • Hevea brasiliensis  (2)
  • Vacuole proteins  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of protein-storing cells associated with a 67 kDa protein in Hevea brasiliensis (1998)
    Springer
    Trees 12 (1998), S. 153-159 
    Details
    ISSN: 0931-1890
    Keywords: Key words Vegetative storage protein ; Phloem ; Nitrogen storage ; Hevea brasiliensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  The protein-storing cells (PSCs) in Hevea brasiliensis were studied by using light- and electron-microscopy and SDS-PAGE. The cells were found in stem and root where secondary phloem was developed. They are a special kind of phloem parenchyma cell which accumulate in their central vacuoles large amounts of protein, fibril-like under an electron microscope, and have few plastids with very small starch grains. Their distribution is strictly restricted to the secondary phloem axial system where they exactly sequestered in functional phloem or slightly over it. A 67 kDa protein was always found in the tissues where the PSCs were observed. During the first seasonal growth flush, the 67 kDa protein in the terminal branchlet exhibits marked quantitative fluctuation which is consistent with the change of the vacuole protein inclusion of the PSCs in the branchlet. These facts suggested that the 67 kDa protein might be the major part of the vacuole protein of the PSCs. Considering the differences between the PSCs in Hevea and the PSCs in the other trees studied, we define two types of PSCs: Hevea-type, which are the cells specialized for protein storage and Populus-type, which are ordinary parenchyma cells accumulating protein and starch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009705
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  • 2
    Electronic Resource
    Electronic Resource
    Vacuole proteins in parenchyma cells of secondary phloem and xylem of Dalbergia odorifera (1993)
    Springer
    Trees 8 (1993), S. 104-109 
    Details
    ISSN: 1432-2285
    Keywords: Legume ; Phloem ; Protein storage ; Vacuole proteins ; Xylem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Light- and electron-microscopic observations were made on the stem parenchyma cells of Dalbergia odorifera T. Chen (Papilionaceae), a tropical deciduous tree. In the secondary phloem of branchlet and trunk, all of the parenchyma cells except companion cells contain vacuole proteins. Only the outer secondary xylem of branchlets, but not trunk secondary xylem, has proteins in the ray parenchyma and the vasicentric parenchyma. The xylem vacuole proteins begin to accumulate at the end of the growing period and they disappear after the first flush of growth in spring. The vacuole proteins in phloem cells, particularly in the cells near the cambium, also show seasonal fluctuations. Under the electron microscope, the vacuole proteins appear as fibrous materials in aggregation or in more or less even dispersion, and they occur in the large central vacuoles during both the growth and dormant periods. According to the published studies, the stem storage proteins in the temperate trees appear as small protein-storage vacuoles or protein bodies, and the proteins in the tropical trees occur in large central vacuoles. This distinction is assumed to be related to the differences in the nature of dormancy between temperate and tropical trees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197688
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of P-protein inHevea brasiliensis during sieve-tube development and after wounding (1990)
    Springer
    Protoplasma 153 (1990), S. 186-192 
    Details
    ISSN: 1615-6102
    Keywords: Hevea brasiliensis ; P-protein ; Sieve element ; Wounding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary P-protein and the changes it undergoes after wounding of sieve tubes of secondary phloem in one- to two-year old shoots ofHevea brasiliensis has been studied using electron microscopy. The P-protein in the form of tubules with a diameter of 8–9 nm and a lumen of 2–2.5 nm occurred in differentiating sieve elements and appeared as compact bodies which consisted of small aggregates of the tubules. As the sieve elements matured, these P-protein bodies dispersed with a disaggregation of the tubules before they turned into striated fibrils, 10–11 nm in diameter. In wounding experiments, as the mature sieve elements collapsed after cutting, their striated P-protein converted into tubules. These tubules were the same in ultrastructure as the tubules in differentiating sieve elements and they often were arranged in crystalline aggregates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01354003
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