VASCULAR SYSTEM OF LODICULES OF DACTYLIS GLOMERATA L.
作者:
Thompson Demetrio Pizzolato,
期刊:
American Journal of Botany
(WILEY Available online 1983)
卷期:
Volume 70,
issue 1
页码: 17-29
ISSN:0002-9122
年代: 1983
DOI:10.1002/j.1537-2197.1983.tb12427.x
出版商: Wiley
数据来源: WILEY
摘要:
The vascular system for the two lodicules in a floret ofDactylis glomerataL. was studied in serial sections. The floret stele contained a few modified tracheary elements and xylem transfer cells enveloped by a phloem of squat sieve‐tube members and intermediary cells. A single sieve tube and associated phloem parenchyma exited the right and left sides of the stele and upon nearing the base of each lodicule branched and formed the minor veins of the lodicule. The minor veins underwent limited branching and anastomosing to form a small three‐dimensional system which described an arc during its ascent in the adaxial portion of each lodicule. The sieve tubes in the minor veins extended halfway up the lodicule and contained short sieve‐tube members with transverse, slightly oblique, or lateral simple sieve plates. The associated phloem parenchyma cells were intermediary cells, companion cells, and less intimate parenchyma cells. Intermediary cells terminated the minor veins and touched the distal ends of the terminal sieve‐tube members, which lacked distal sieve plates. Although the transverse area of the sieve‐tube members remained constant up the lodicule, the transverse area of the associated phloem parenchyma fluctuated.
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