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ONTOGENY OF PHLOEM IN THE SUGAR BEET ( BETA VULGARIS L.)
Author(s) -
Esau Katherine
Publication year - 1934
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.1537-2197.1934.tb04992.x
Subject(s) - biology , citation , phloem , ontogeny , botany , classics , library science , history , computer science , genetics
In connection with an investigation of the anatomical changes induced in the sugar beet by the curly-top disease, it was necessary to make a detailed study of the healthy phloem. Its structure, at maturity, was described in an earlier publication (Esau, I933). This paper deals mainly with the developmental stages of this tissue, especially the sieve tubes. It will form the background for a study of the stages of phloem degeneration in beets affected by curly top. The material and methods used in this work were the same as those previously described (1933). As a source of phloem tissue, the petioles proved to be better than the roots because they furnish comparatively long strands of vascular tissue, straight and free of anastomoses.