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EFFECT OF TEMPERATURES ABOUT 273 K (0 C) ON THE ULTRASTRUCTURE OF MERISTEMATIC CELLS IN THE ONION (ALLIUM CEPA L.) AND THE RADISH (RAPHANUS SATIVUS L.).

INFLUENCE DE TEMPERATURES DE 273 K (0 C) ENVIRON SUR L'ULTRASTRUCTURE DES CELLULES MERISTEMATIQUES D'OIGNON (ALLIUM CEPA L.) ET DE RADIS (RAPHANUS SATIVUS L.).

Author(s) : GENEVES L., HOMAYOUNFAR Y., RUTIN J.

Type of article: Article, IJR article

Summary

DURING EXPOSURE TO TEMPERATURE AROUND 273 K (0 C), THE PERIPHERIC GRANULAR ZONE OF THE NUCLEOLI BECOMES THINNER. THIS REDUCTION IS MORE DISTINCT IN THE NUCLEOLI OF ALLIUM ROOTS, THAN IN THE CELLS OF RAPHANUS. THE GRANULAR ZONE APPEARS MORE COMPACT, THE SMALL IRREGULAR CLEAR SPACE WERE SCARCE. IN THE FIBRILLAR ZONE, THE TRANSPARENT LACUNES POSSESS NO OR SCARCE GRANULES. IN THE ONION ROOTS, THEY CAN POSSESS GRANULES WHICH WERE LARGER (20 TO 25 MM) THAN THOSE OF THE PERIPHERIC ZONE. AT THE BEGINNING OF THE WARMING-UP, THE GRANULAR ZONE OF THE NUCLEOLI BECOMES EXTENDED AND TAKES ON SPONGY STRUCTURE. IN THE FIBRILLAR ZONE, SOME CLEAR LACUNES POSSESS NUMEROUS GRANULES.

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Pages: 135-144

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Details

  • Original title: INFLUENCE DE TEMPERATURES DE 273 K (0 C) ENVIRON SUR L'ULTRASTRUCTURE DES CELLULES MERISTEMATIQUES D'OIGNON (ALLIUM CEPA L.) ET DE RADIS (RAPHANUS SATIVUS L.).
  • Record ID : 1981-0078
  • Languages: French
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 3 - n. 3
  • Publication date: 1980/05

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