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Titolo:
ULTRASTRUCTURAL AND HISTOCHEMICAL POSTFERTILIZATION MEGAGAMETOPHYTE AND ZYGOTIC EMBRYO DEVELOPMENT OF WHITE SPRUCE (PICEA-GLAUCA) EMPHASIZING THE DEPOSITION OF SEED STORAGE PRODUCTS
Autore:
KRASOWSKI MJ; OWENS JN;
Indirizzi:
BRITISH COLUMBIA MINIST FORESTS,RED ROCK RES STN PRINCE GEORGE V2N 2J5 BC CANADA UNIV VICTORIA,CTR FOREST BIOL VICTORIA V8W 2Y2 BC CANADA
Titolo Testata:
Canadian journal of botany
fascicolo: 1, volume: 71, anno: 1993,
pagine: 98 - 112
SICI:
0008-4026(1993)71:1<98:UAHPMA>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROTEIN BODY FORMATION; MAIZE ENDOSPERM; ENDOPLASMIC-RETICULUM; VICIA-FABA; BODIES; COTYLEDONS; EMBRYOGENESIS; GERMINATION; PINE; ORIGIN;
Keywords:
PICEA; ULTRASTRUCTURE; HISTOCHEMISTRY; MEGAGAMETOPHYTE; EMBRYO; SEED;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Krasowski e J.N. Owens, "ULTRASTRUCTURAL AND HISTOCHEMICAL POSTFERTILIZATION MEGAGAMETOPHYTE AND ZYGOTIC EMBRYO DEVELOPMENT OF WHITE SPRUCE (PICEA-GLAUCA) EMPHASIZING THE DEPOSITION OF SEED STORAGE PRODUCTS", Canadian journal of botany, 71(1), 1993, pp. 98-112

Abstract

Deposition of major storage substances in the megagametophyte and embryo of white spruce (Picea glauca (Moench) Voss) was studied ultrastructurally and histochemically during seed development. Lipid bodies appeared to be secreted by the smooth endoplasmic reticulum. In the megagametophyte they were deposited rapidly from the club-shaped embryo stage until the early organogenesis of the embryo. Major lipid accumulation in the embryo took place during rapid cotyledon development and simultaneously with the buildup of protein bodies. Formation of protein bodies in the megagametophyte and in the embryo was first detected approximately 6 and 29 days after fertilization, respectively. It is suggested that in the megagametophyte, this process proceeded by (i) deposition of amorphous protein clumps onto tonoplasts of subdividing vacuoles during early stages of protein body formation, (ii) fusion of smallcytoplasmic vesicles possibly derived from the rough endoplasmic reticulum, and (iii) deposition of protein around dense, membrane-bound vesicles attached to tonoplasts. The third process was not observed in the embryo. During advanced formation, fusion of cytoplasmic vesicles into developing protein bodies was the only process observed in the megagametophyte and in the embryo. White spruce seed protein bodies contained a variable number of crystalloids and globoid cavities except in the embryo in which only single globoid cavities were observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 07:05:51