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MORPHOLOGICAL AND ULTRASTRUCTURAL DEVELOPMENT AND STARCH ACCUMULATION DURING CHILLING OF SOUR CHERRY FLOWER BUDS
Author(s) -
Felker Frederick C.,
Robitaille Henry A.,
Hess F. Dana
Publication year - 1983
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1983.tb06405.x
Subject(s) - biology , ultrastructure , starch , botany , shoot , ovule , prunus , bud , ovary , plastid , pollen , parenchyma , chloroplast , biochemistry , gene , endocrinology
Floral tissue of dormant sour cherry ( Prunus cerasus L.) flower buds was examined by light and electron microscopy during field development and laboratory chilling. Differentiation of flower parts ceased by early November and there was no further morphological development until visible signs of budbreak occurred after the end of rest. Pollen meiosis occurred at the half green budbreak stage. No ultrastructural changes accompanied chilling accumulation except development of numerous starch grains in plastids. Buds on cut shoots held at the non‐chilling temperature of 15 C developed more mitochondria but acquired no starch when compared with buds on cut shoots held at a 5 C chilling temperature. Nuclei and nucleoli enlarged with chilling in ovules and sporogenous cells but not in ovary parenchyma. Accumulation of starch with chilling in most bud tissues was demonstrated histochemically.