Foliar Venation in Angiosperms From an Ontogenetic Standpoint

Foster, Adriance S.

doi:10.1002/j.1537-2197.1952.tb13099.x

Cited by 67 publications

(16 citation statements)

References 14 publications

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“…With this more recent work, the traditional expectation of a shared set of discrete intercalary and marginal meristems has been recognized as an artifact of reliance on longitudinal leaf sections when paradermal views are needed to discern overall growth dynamics correctly (Poethig and Sussex 1985a). Indeed, early uses of paradermal techniques (Foster 1952) today seem prophetic: growth in fern pinnules is marginal (Nephrolepis: Pray 1960; Regnellidium: Pray 1962), while any marginal growth in angiosperm leaves is early and of minor importance (Liriodendron: Pray 1955a;Hosta: Pray 1955b).…”

Section: Introductionmentioning

confidence: 97%

Mechanisms of Laminar Growth in Morphologically Convergent Leaves and Flower Petals

Boyce

2007

International Journal of Plant Sciences

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Distinct leaf laminar growth dynamics have been found previously in some filicalean ferns and angiosperm seed plants: a discrete zone of marginal growth versus diffuse intercalary growth throughout the leaf without a conspicuous marginal growth zone. The fern pinnules for which marginal growth is known are also morphologically distinct from dicots: one or two orders of dichotomizing veins ending only along the margin versus many orders that include internally directed veins and endings dispersed throughout the leaf. Both of those morphological alternatives have evolved many times among extant and fossil plants, but whether similar developmental processes underlie each recurrence of a particular laminar morphology has not been investigated. Here, marginal growth is demonstrated in two independent examples of fernlike open venation patterns among living seed plants, frond leaflets of the cycad Ceratozamia and flower petals of Ranunculus. Thus, in these cases, morphological convergence is shown to reflect developmental convergence. Given the preponderance of simple, fernlike laminar morphologies among fossil and extant basal seed plants, angiosperm laminar development is likely to be as highly derived as their unusual laminar venation patterns.

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Section: Introductionmentioning

confidence: 97%

Mechanisms of Laminar Growth in Morphologically Convergent Leaves and Flower Petals

Boyce

2007

International Journal of Plant Sciences

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“…Vascular cells differentiate from procambial cells: narrow, cytoplasm‐dense cells, characteristically arranged in continuous strands (Esau, 1 943). In leaves, procambial strands develop from files of isodiametric ‘preprocambial’ cells, which are selected from the anatomically homogeneous subepidermal tissue of the leaf primordium, the ground meristem (Foster, 1 952; Pray, 1 955). The mechanism by which cells are specified to procambial cell fate is unknown, but an instrumental role for auxin transport and distribution in this process has increasingly gained support (Sachs, 1 981, 1 989; Mattsson et al ., 1999, 2003; Sieburth, 1 999; Scarpella et al ., 2006).…”

Section: Introductionmentioning

confidence: 99%

Time‐lapse imaging of Arabidopsis leaf development shows dynamic patterns of procambium formation

Sawchuk¹,

Head²,

Donner

et al. 2007

New Phytologist

153

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Summary• The principles underlying the formation of leaf veins have long intrigued developmental biologists. In leaves, networks of vascular precursor procambial cells emerge from seemingly homogeneous subepidermal tissue through the selection of anatomically inconspicuous preprocambial cells. Understanding dynamics of procambium formation has been hampered by the difficulty of observing the process in vivo .• Here we present a live-imaging technique that allows visual access to complex events occurring in developing leaves. We combined this method with stage-specific fluorescent markers in Arabidopsis ( Arabidopsis thaliana ) to visualize preprocambial strand formation and procambium differentiation during the undisturbed course of development and upon defined perturbations of vein ontogeny.• Under all experimental conditions, we observed extension, termination and fusion of preprocambial strands and simultaneous initiation of procambium differentiation along entire individual veins.• Our findings strongly suggest that progressiveness of preprocambial strand formation and simultaneity of procambium differentiation represent inherent properties of the mechanism underlying vein formation.

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“…For the most part, these studies have been either descriptive or concerned with tracing the ontogenetic development of certain leaf tissues or anatomical features. It has now been generally established that differentiation of the mesophyll and photosynthetic tissues proceed basipetally in the lamina, while simultaneous differentiation of the major vein network proceeds acropetally (Avery, 1933;Esau, 1943;Foster, 1952;Maksymowych, 1959).…”

mentioning

confidence: 99%