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OBSERVATIONS ON SIEVE ELEMENTS IN THREE PERENNIAL MONOCOTYLEDONS
Author(s) -
Ervin Edward L.,
Evert Ray F.
Publication year - 1970
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.1537-2197.1970.tb09810.x
Subject(s) - biology , sieve (category theory) , sieve tube element , botany , callose , perennial plant , phloem , cell wall , mathematics , combinatorics
Seasonal collections were made of rhizomes of Polygonatum canaliculatum and Typha latifolia and of aerial stems of Smilax hispida . Many metaphloem sieve elements in all three species remain functional for 2 or more years, or for the life of the plant parts in which they occur. Although the protoplasts of mature sieve elements remain similar in appearance from one time of year to the next, the amount of callose associated with the sieve plates and lateral sieve areas of such cells apparently varies with the seasons, being heavier in late fall and winter and lighter in late spring and summer. At maturity the metaphloem sieve elements contain strands derived from the slime bodies of immature cells. It is suggested that in mature sieve elements the slime strands normally occur as a network along the wall. Many mature sieve elements of S. hispida contained normal‐appearing nuclei.