ISSN:
1615-6102
Keywords:
Anatomy
;
Artemisia
;
Cell wall composition
;
Compositae
;
Phloem
;
Sieve element
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The structure of the phloem was studied in stem and leaf ofArtemisia afra Jacq., with particular attention being given to the sieve element walls. Both primary and secondary sieve elements of stem and midvein have nacreous walls, which persist in mature cells. Histochemical tests indicated that the sieve element wall layers contained some pectin. Sieve element wall layers lack lignin. Sieve elements of the minor veins (secondary and tertiary veins) lack nacreous thickening, although their walls may be relatively thick. These walls and those of contiguous transfer cells are rich in pectic substances. Transfer cell wall ingrowths are more highly developed in tertiary than in secondary veins.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01287443
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