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ORGANIZATION OF THE MORPHOPHYSIOLOGIC UNIT IN ANAGALLIS ARVENSIS AND ITS RELATION WITH THE PERPETUATION MECHANISM AND SENESCENCE
Author(s) -
Trippi Victorio S.,
Brulfert Jeanne
Publication year - 1973
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.1537-2197.1973.tb05968.x
Subject(s) - biology , indeterminate growth , senescence , organism , indeterminate , morphogenesis , photoperiodism , ontogeny , mechanism (biology) , botany , microbiology and biotechnology , genetics , gene , mathematics , epistemology , pure mathematics , cultivar , ideotype , philosophy
The organization of the morphophysiological unit in Anagallis arvensis L. is conditioned by vegetative growth, which is expressed as indeterminate under short‐day conditions and as determinate under long‐day ones. The perpetuation mechanism is a function of the environment. Under SD conditions ontogenetic morphogenesis is incomplete, and the unit does not form specific reproductive structures; indeterminate growth and permanent rooting capacity provide an efficient mechanism for perpetuation. Under LD complete ontogenetic morphogenesis assures perpetuation by seeds. The appearance of senescence is independent of the nature of the morphophysiological unit and is directly related to growth cessation. It affects organs only when growth is indeterminate (SD) and the whole organism when growth is determinate (LD). Organ senescence seems related to growth itself, and organism senescence would appear closely related to photoperiodic effects. Photoperiod controls organization of the unit, ontogenetic morphogenesis, and organism senescence simultaneously. The number of leaves per node, flowering, organization, and senescence of the organism are all directed toward a more or less evolved state by the effects of the photoperiodic condition.