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THE DEVELOPMENT OF ENDOSPERM AMYLOPLASTS DURING GRAIN MATURATION IN BARLEY
Author(s) -
Williams J. M.,
Duffus C. M.
Publication year - 1978
Publication title -
journal of the institute of brewing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.523
H-Index - 51
eISSN - 2050-0416
pISSN - 0046-9750
DOI - 10.1002/j.2050-0416.1978.tb03838.x
Subject(s) - amyloplast , endosperm , anthesis , caryopsis , biology , population , photosynthesis , starch , botany , granule (geology) , chloroplast , chemistry , poaceae , plastid , biochemistry , gene , paleontology , demography , sociology , cultivar
The ultrastructural changes accompanying endosperm maturation in barley are described with particular reference to the developing amyloplast. Starch synthesis within the young amyloplast was initiated at a number of sites which later coalesced into a single granule. By 14 days after anthesis two populations of amyloplast, large and small, were seen. These were present throughout endosperm maturation. From results using UDP‐(U 14 C)—glucose introduced to the endosperm from the flag leaf during ear photosynthesis, it is suggested that the small amyloplasts do not arise from the large amyloplasts but that they constitute a separate population.