DETERMINISM OF THE MYCORRHIZOGENIC ROOT FORMATION IN PINUS PINASTER SOL

Autor: A. David, M. Faye, M. Rancillac
Rok vydání: 1981
Předmět:
Zdroj: New Phytologist. 87:557-565
ISSN: 1469-8137
0028-646X
DOI: 10.1111/j.1469-8137.1981.tb03226.x
Popis: SUMMARY Seedlings, axillary buds and apical root meristems of Pine (Pinus pinaster Sol.) were used in different controlled environments. A kinetic study of root morphogenesis was performed, supported by light and electron microscopic analysis. Without any symbiotic or parasitic fungus, short roots (histologically similar to the ectomycorrhizae except for the absence of the fungus), able to produce dichotomous branches, were observed on all the kinds of explant and in all the environmental conditions used. Hence the formation of these mycorrhizogenic short roots is ‘genome dependent’. In clones of young plant lets (produced by vegetative propagation by means of axillary budding in vitro), the root systems exhibit a similar intensity, strong or weak, to dichotomize; this emphasizes the relationships between the formation of mycorrhizogenic short roots and the pinus genome. This study seems to be the first attempt to demonstrate, under controlled conditions, a direct relationship between plant genome and root branching in a woody species.
Databáze: OpenAIRE
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