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The Occurrence of Vascular Cavities and Specialized Parenchyma Cells in the Roots of Cool‐season Legumes
Author(s) -
Rost T. L.,
Lu P.,
Gladish D.
Publication year - 1991
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1991.tb00234.x
Subject(s) - xylem , pisum , biology , sativum , legume , vascular bundle , parenchyma , botany , vascular tissue , lupinus angustifolius , vicia faba , growing season
The seeds of 20 legume species were grown in the greenhouse or in growth chambers at different temperatures. Under warm temperature conditions (above 15 °C), six species, pea ( Pisum sativum ), broadbean ( Vicia faba ), chickpea ( Cicer arietinum ), lentil ( Lens culinaris ), wild lupine ( Lupinus latifolius ), and soybean ( Glycine max ), formed cavities in the vascular cylinder of their primary roots, which in turn became filled by the ingrowth of specialized parenchyma cells (SP cells). When these species were grown at low temperature (below 15 °C), however, a “normal” vascular cylinder formed in the primary roots with late‐maturing metaxylem vessel members differentiating in the center. These species were all cool‐season legumes except soybean, a warm‐season legume, which sometimes also formed cavities and SP cell ingrowths. The occurrence of cavities and SP cells therefore was restricted to the cool‐season legumes (except soybean) when they were grown under warm temperature conditions. The position and size of cavities varied among these species. Pea and broadbean usually formed large, axially elongated cavities in the central vascular cylinder, or in the xylem poles. Others formed smaller cavities of various lengths.