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Developmental Genetics and Morphological Evolution of Flowering Plants, Especially Bladderworts ( Utricularia ): Fuzzy Arberian Morphology Complements Classical Morphology


Rutishauser, R (2001). Developmental Genetics and Morphological Evolution of Flowering Plants, Especially Bladderworts ( Utricularia ): Fuzzy Arberian Morphology Complements Classical Morphology. Annals of Botany, 88(6):1173-1202.

Abstract

This review compares new developmental models on flowering and other vascular plants with evolutionary hypotheses formulated by Agnes Arber (1879-1960) and like-minded botanists. Special emphasis is laid on philosophical basics such as perspectivism, pluralism about evolutionary modelling, continuum way of thinking, and fuzzy logic. Arber's perspective is best labelled as F uzzy A rberian M orphology (FAM Approach). Its proponents (‘FAMmers') treat structural categories (e.g. ‘roots', ‘shoots', ‘stems', ‘leaves', ‘stipules') in vascular plants as concepts with fuzzy borderlines allowing intermediates (including transitional forms, developmental mosaics). The FAM Approach complements Cla ssical Plant M orphology (ClaM Approach), which is the traditional approach in botany. ClaM proponents (‘ClaMmers') postulate that the structural categories of vascular plants are regarded as concepts with clear-cut borderlines and without intermediates. However, during the evolution of vascular plants, the root-shoot distinction and the stem-leaf distinction have become blurred several times due to developmental changes, resulting in organs with unique combinations of features. This happened, for example, in the bladderworts (Utricularia, Lentibulariaceae). When focusing on the ‘leaf', the FAM Approach is identical to Arber's ‘partial-shoot theory of the leaf' and Sinha's ‘leaf shoot continuum model'. A compound leaf can repeat the developmental pathway of the whole shoot, at least to some degree. For example, compound leaves of Chisocheton(Meliaceae) with indeterminate apical growth and three-dimensional branching may be seen as developmental mosaics sharing some growth processes with whole shoots! We focus here on the FAM Approach because this perspective is especially promising for developmental geneticists studying flowering and other vascular plants. Copyright 2001 Annals of Botany Company

Abstract

This review compares new developmental models on flowering and other vascular plants with evolutionary hypotheses formulated by Agnes Arber (1879-1960) and like-minded botanists. Special emphasis is laid on philosophical basics such as perspectivism, pluralism about evolutionary modelling, continuum way of thinking, and fuzzy logic. Arber's perspective is best labelled as F uzzy A rberian M orphology (FAM Approach). Its proponents (‘FAMmers') treat structural categories (e.g. ‘roots', ‘shoots', ‘stems', ‘leaves', ‘stipules') in vascular plants as concepts with fuzzy borderlines allowing intermediates (including transitional forms, developmental mosaics). The FAM Approach complements Cla ssical Plant M orphology (ClaM Approach), which is the traditional approach in botany. ClaM proponents (‘ClaMmers') postulate that the structural categories of vascular plants are regarded as concepts with clear-cut borderlines and without intermediates. However, during the evolution of vascular plants, the root-shoot distinction and the stem-leaf distinction have become blurred several times due to developmental changes, resulting in organs with unique combinations of features. This happened, for example, in the bladderworts (Utricularia, Lentibulariaceae). When focusing on the ‘leaf', the FAM Approach is identical to Arber's ‘partial-shoot theory of the leaf' and Sinha's ‘leaf shoot continuum model'. A compound leaf can repeat the developmental pathway of the whole shoot, at least to some degree. For example, compound leaves of Chisocheton(Meliaceae) with indeterminate apical growth and three-dimensional branching may be seen as developmental mosaics sharing some growth processes with whole shoots! We focus here on the FAM Approach because this perspective is especially promising for developmental geneticists studying flowering and other vascular plants. Copyright 2001 Annals of Botany Company

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Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:580 Plants (Botany)
Scopus Subject Areas:Life Sciences > Plant Science
Language:English
Date:1 December 2001
Deposited On:25 Sep 2018 10:27
Last Modified:15 Apr 2021 14:48
Publisher:Oxford University Press
ISSN:0305-7364
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1006/anbo.2001.1498

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