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SIEVE‐TUBE PLASTIDS OF HAMAMELIDIDAE ELECTRON MICROSCOPIC INVESTIGATIONS WITH SPECIAL REFERENCE TO URTICALES
Author(s) -
Behnke H.D.
Publication year - 1973
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1218124
Subject(s) - plastid , sieve tube element , ultrastructure , botany , starch , sieve (category theory) , biology , chloroplast , phloem , biochemistry , mathematics , combinatorics , gene
Summary Ultrastructural analysis of sieve tubes of Hamamelididae (48 species from 16 families and 12 of the 15 orders investigated) showed a rather uniform distribution of S‐type plastids (storing starch only) among this subclass. P‐type plastids (storing protein) were reported only for the genus Ulmus . Some other species belonging to the Urticales contain sieve‐tube plastids storing neither starch nor protein; however, the scarce formation of minute starch grains in at least two species of the latter group joins them to the S‐type plastids.