Foliar Venation of Angiosperms. II. Histogenesis of the Venation of Liriodendron

Pray, Thomas R.

doi:10.2307/2438589

Cited by 39 publications

(8 citation statements)

References 4 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If, in a 1-cell wide hPED, a cell division parallel to the axis of the strand generates a spot 2-cells wide (Figures 4A,B; See also Figures 6K–N), centrobasal PIN1 localization in the two daughter cells is followed by decreased PIN1 expression in one of them (Figures 4A,B; See also Figures 6K–N), indicating a persistent mechanism of hPED self-restriction to minimal widths. This observation is consistent with earlier reports that vascular precursors in the developing leaf occasionally divide to produce one vascular daughter cell and one non-vascular daughter cell (Pray, 1955). Taken together, these results indicate that the elaboration of the leaf vascular network proceeds from relatively widespread PIN1 expression in many connected, wide hPEDs to general hPED narrowing, with procambium formation occurring in the cell files with sustained PIN1 expression.…”

Section: Resultssupporting

confidence: 93%

“…In leaf primordia, xylem and phloem both differentiate from procambial precursors: long, narrow, cytoplasm-dense cells, (Esau, 1965) arranged in continuous strands (Esau, 1943). In leaves, procambial strands arise from continuous files of isodiametric “preprocambial” cells, which are selected from the anatomically homogeneous subepidermal tissue of the leaf primordium (Foster, 1952; Pray, 1955; Scarpella et al, 2004). Procambial cells subsequently acquire their characteristic narrow shape through coordinated, oriented cell divisions parallel to the axis of the strand (Foster, 1952; Esau, 1965).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic auxin transport patterns preceding vein formation revealed by live-imaging of Arabidopsis leaf primordia

Marcos

Berleth

2014

Front. Plant Sci.

View full text Add to dashboard Cite

Self-regulatory patterning mechanisms capable of generating biologically meaningful, yet unpredictable cellular patterns offer unique opportunities for obtaining mathematical descriptions of underlying patterning systems properties. The networks of higher-order veins in leaf primordia constitute such a self-regulatory system. During the formation of higher-order veins, vascular precursors are selected from a homogenous field of subepidermal cells in unpredictable positions to eventually connect in complex cellular networks. Auxin transport routes have been implicated in this selection process, but understanding of their role in vascular patterning has been limited by our inability to monitor early auxin transport dynamics in vivo. Here we describe a live-imaging system in emerging Arabidopsis thaliana leaves that uses a PIN1:GFP reporter to visualize auxin transport routes and an Athb8:YFP reporter as a marker for vascular commitment. Live-imaging revealed common features initiating the formation of all higher-order veins. The formation of broad PIN1 expression domains is followed by their restriction, leading to sustained, elevated PIN1 expression in incipient procambial cells files, which then express Athb8. Higher-order PIN1 expression domains (hPEDs) are initiated as freely ending domains that extend toward each other and sometimes fuse with them, creating connected domains. During the restriction and specification phase, cells in wider hPEDs are partitioned into vascular and non-vascular fates: Central cells acquire a coordinated cell axis and express elevated PIN1 levels as well as the pre-procambial marker Athb8, while edge cells downregulate PIN1 and remain isodiametric. The dynamic nature of the early selection process is underscored by the instability of early hPEDs, which can result in dramatic changes in vascular network architecture prior to Athb8 expression, which is correlated with the promotion onto vascular cell fate.

show abstract

Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Dynamic auxin transport patterns preceding vein formation revealed by live-imaging of Arabidopsis leaf primordia

Marcos

Berleth

2014

Front. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…Some of the distinctive characteristics of angiosperm leaves have arisen independently in other lineages, whereas other traits are unique to the flowering plants. Angiosperms have evolved leaf growth that occurs diffusely throughout the leaf without being limited to the margin (Pray 1955;Sussex 1985a, 1985b), thus, enabling the enormous diversity and complexity of angiosperm leaf venation patterns and shapes. The phylogenetic distribution of complex venation patterns suggest that the evolutionary departures from marginal growth observed in the angiosperms have also arisen repeatedly in two or three other seed plant lineages and 10 or more groups of ferns (Boyce 2005).…”

Section: A Brief History Of the Angiosperm Leaf And Shape Diversity Tmentioning

confidence: 99%

The evolution and functional significance of leaf shape in the angiosperms

Nicotra

Leigh

Boyce

et al. 2011

Functional Plant Biol.

442

396

View full text Add to dashboard Cite

Abstract. Angiosperm leaves manifest a remarkable diversity of shapes that range from developmental sequences within a shoot and within crown response to microenvironment to variation among species within and between communities and among orders or families. It is generally assumed that because photosynthetic leaves are critical to plant growth and survival, variation in their shape reflects natural selection operating on function. Several non-mutually exclusive theories have been proposed to explain leaf shape diversity. These include: thermoregulation of leaves especially in arid and hot environments, hydraulic constraints, patterns of leaf expansion in deciduous species, biomechanical constraints, adaptations to avoid herbivory, adaptations to optimise light interception and even that leaf shape variation is a response to selection on flower form. However, the relative importance, or likelihood, of each of these factors is unclear. Here we review the evolutionary context of leaf shape diversification, discuss the proximal mechanisms that generate the diversity in extant systems, and consider the evidence for each the above hypotheses in the context of the functional significance of leaf shape. The synthesis of these broad ranging areas helps to identify points of conceptual convergence for ongoing discussion and integrated directions for future research.

show abstract

“…Vascular bundles differentiate from procambial cells: narrow, cytoplasm-dense cells, characteristically arranged in continuous strands (Esau, 1943), which in leaves seem to emerge de novo from within the morphologically homogeneous population of apparently naïve ground cells (Foster, 1952;Pray, 1955).…”

Section: Introductionmentioning

confidence: 99%

Regulation of preprocambial cell state acquisition by auxin signaling inArabidopsisleaves

2009

View full text Add to dashboard Cite

The principles underlying the formation of veins in the leaf have long intrigued developmental biologists. In Arabidopsis leaves, files of anatomically inconspicuous subepidermal cells that will elongate into vein-forming procambial cells selectively activate ATHB8 gene expression. The biological role of ATHB8 in vein formation and the molecular events that culminate in acquisition of the ATHB8 preprocambial cell state are unknown, but intertwined pathways of auxin transport and signal transduction have been implicated in defining paths of vascular strand differentiation. Here we show that ATHB8 is required to stabilize preprocambial cell specification against auxin transport perturbations, to restrict preprocambial cell state acquisition to narrow fields and to coordinate procambium formation within and between veins. We further show that ATHB8 expression at preprocambial stages is directly and positively controlled by the auxin-response transcription factor MONOPTEROS (MP) through an auxin-response element in the ATHB8 promoter. We finally show that the consequences of loss of ATHB8 function for vein formation are masked by MP activity. Our observations define, at the molecular level, patterning inputs of auxin signaling in vein formation.

show abstract

Foliar Venation of Angiosperms. II. Histogenesis of the Venation of Liriodendron

Cited by 39 publications

References 4 publications

Dynamic auxin transport patterns preceding vein formation revealed by live-imaging of Arabidopsis leaf primordia

Dynamic auxin transport patterns preceding vein formation revealed by live-imaging of Arabidopsis leaf primordia

The evolution and functional significance of leaf shape in the angiosperms

Regulation of preprocambial cell state acquisition by auxin signaling inArabidopsisleaves

Contact Info

Product

Resources

About