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Stringently and developmentally regulated levels of a cytoplasmic double-stranded RNA and its high-efficiency transmission via egg and pollen in rice (1996)

Moriyama, H. ; Kanaya, K. ; Wang, J. Z. ; [et al.]

Springer

Plant molecular biology 31 (1996), S. 713-719

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ISSN: 1573-5028

Keywords: biparental transmission ; copy number ; cultured cell ; cytoplasmic inheritance ; double-stranded RNA ; Oryza sativa

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract A very restricted amount of high-molecular-weight double-stranded RNA (dsRNA) has been found in healthy japonica rice plants. We discriminated dsRNA-carrying rice plants from noncarriers. The endogenous dsRNA was localized in the cytoplasm (about 100 copies per cell) and was transmissible to progeny plants by mating. In crosses between carriers and noncarriers, the RNA was transmitted efficiently to F1 plants via both egg and pollen. The rice dsRNA was maintained at an almost constant level by host plant cells from generation to generation. The high-efficiency transmission of the endogenous dsRNA to progeny plants appears to depend on the autonomously controlled replication of the dsRNA localized in cytoplasmic vesicles. However, an increase in copy number (about 10-fold) of the dsRNA was observed during the suspension culture of host cells. The number of copies of dsRNA returned to the original low value in regenerated plants, suggesting that the copy number is stringently and developmentally regulated in rice cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00019459

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Morphology of the tooth of the American alligator (Alligator mississippiensis): The fine structure and elemental analysis of the cementum (1992)

Shimada, K. ; Sato, I. ; Moriyama, H.

New York, NY : Wiley-Blackwell

Journal of Morphology 211 (1992), S. 319-329

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ISSN: 0362-2525

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: The fine structure and the concentration of trace elements in the cementum layer in functional teeth of subadult alligators (ca. 120 cm to 160 cm total length) was studied by using scanning electron microscopy (SEM), microradiography, and electron microprobe analysis (EMPA). The cementum layer was hypertrophic and consisted of two layers: the fibrous layer and the calcified layer. The two layers undergo developmental changes as a result of resorption and replacement. During the tooth replacement in the American alligator, trace elements decreased at the base of the dentine layer; the resorption of the alveolar bone occurred simultaneously at the tooth socket. We concluded that the resorption of the cementum in the alligator provided a useful indication of the mechanism of tooth replacement in crocodilian.

Additional Material: 9 Ill.