Roles for auxin during morphogenesis of the compound leaves of pea ( Pisum sativum )

DeMason, Darleen A.; Chawla, Rekha

doi:10.1007/s00425-004-1221-x

Cited by 24 publications

(50 citation statements)

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“…Chemical disruption of auxin transport results in leaf simplification (Avasarala et al, 1996;Barkoulas et al, 2008;DeMason and Chawla, 2004;Reinhardt et al, 2000) and pin1 mutants in the compound-leafed species Cardamine hirsuta produce simple leaves (Barkoulas et al, 2008). ChPIN1 localization after leaflet initiation closely resembles the reported PIN1 localization subsequent to leaf initiation in A. thaliana.…”

Section: Introductionmentioning

confidence: 80%

Auxin patternsSolanum lycopersicumleaf morphogenesis

Koenig¹,

Bayer

Kang³

et al. 2009

Development

188

223

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One of the most striking aspects of plant diversity is variation in leaf shape. Much of this diversity is achieved by the modulation of leaf blade dissection to form lobes or leaflets. Here, we show that the phytohormone auxin is a crucial signal regulating the partitioned outgrowth necessary to develop a dissected leaf. In developing leaves, the asymmetric distribution of auxin, driven by active transport, delineates the initiation of lobes and leaflets and specifies differential laminar outgrowth. Furthermore, homologous members of the AUX/indole-3-acetic acid (IAA) gene family mediate the action of auxin in determining leaf shape by repressing outgrowth in areas of low auxin concentration during both simple and compound leaf development. These results provide molecular evidence that leaflets initiate in a process reminiscent of organogenesis at the shoot apical meristem, but that compound and simple leaves regulate marginal growth through an evolutionarily conserved mechanism, thus shedding light on the homology of compound and simple leaves.

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Section: Introductionmentioning

confidence: 80%

Auxin patternsSolanum lycopersicumleaf morphogenesis

Koenig¹,

Bayer

Kang³

et al. 2009

Development

188

223

View full text Add to dashboard Cite

show abstract

“…Recent studies have implicated auxin distribution as a patterning mechanism for compound leaves, and blocking auxin transport results in leaf simplification (Avasarala et al, 1996;Reinhardt et al, 2000;DeMason and Chawla, 2004;Barkoulas et al, 2008). Arabidopsis and Cardamine hirsuta are distantly related species, but have simple and dissected leaves with an individual leaflet, respectively.…”

Section: Discussionmentioning

confidence: 99%

YUCCAGenes Are Expressed in Response to Leaf Adaxial-Abaxial Juxtaposition and Are Required for Leaf Margin Development

Wang

et al. 2011

Plant Physiology

100

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During leaf development, the formation of leaf adaxial-abaxial polarity at the primordium stage is crucial for subsequent leaf expansion. However, little is known about the genetic control from polarity establishment to blade outgrowth. The leaf margin, comprising elongated margin cells and hydathodes, is thought to affect leaf expansion. Here, we show that mutants with defective leaf polarity or with loss of function in the multiple auxin-biosynthetic YUCCA (YUC) genes exhibited a similar abnormal leaf margin and less-expanded leaves. Leaf margins of these mutants contained fewer hydathodes and an increased number of cell patches in which the patterns of epidermal cells resembled those of hydathodes. The previously characterized leafabaxialized asymmetric leaves2 (as2) revoluta (rev) and leaf-adaxialized kanadi1 (kan1) kan2 double mutants both produce fingershaped, hydathode-like protrusions on adaxial and abaxial leaf surfaces, respectively. YUCs are required for formation of the protrusions, as those produced by as2 rev and kan1 kan2 were absent in the yuc1 yuc2 yuc4 triple mutant background. Expressions of YUC1, YUC2, and YUC4 were spatially regulated in the leaf, being associated with hydathodes in wild-type leaves and protrusions on as2 rev and kan1 kan2 leaves. In addition, inhibition of auxin transport by treatment of seedlings with N-(1-naphtyl) phtalamic acid or disruption of the auxin gradient by transforming plants with the 35S:YUC1 construct also blocked leaf margin development. Collectively, our data show that expressions of YUCs in the leaf respond to the adaxial-abaxial juxtaposition, and that the activities of auxin mediate leaf margin development, which subsequently promotes blade outgrowth.

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“…DeMason and Chawla speculate that UNI is regulated by auxin concentration gradients and/or auxin transport. In wild-type pea, UNI expression correlates with the predicted site of auxin action (DeMason and Chawla, 2004). Interestingly, in Arabidopsis, LFY is regulated by GA via MYB-domain proteins (Gocal et al, 2001).…”

Section: Hormone Network In Compound Leaf Developmentmentioning

confidence: 98%

“…Wildtype and uni-tac (a mild allele of uni) plantlets were cultured on auxin transport inhibitors and an auxin antagonist. Both wild-type and mutant plantlets displayed reduced leaf complexity, and had reduced UNI transcript levels within the shoot apex (DeMason and Chawla, 2004). In young pea leaves, auxin concentrations are highest at the tip.…”

Section: Hormone Network In Compound Leaf Developmentmentioning

confidence: 99%

“…Interestingly, in Arabidopsis, LFY is regulated by GA via MYB-domain proteins (Gocal et al, 2001). DeMason and Chawla propose that auxin may regulate LFY/UNI expression through GA in pea (DeMason and Chawla, 2004), as it has been established that auxins regulate GA biosynthesis. (Kim et al, 2003;Janssen et al, 1998 (AtMYB33), which mediates response to GA, binds to a specific sequence in the LFY promoter (Gocal et al, 2001).…”

Section: Hormone Network In Compound Leaf Developmentmentioning

confidence: 99%

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Compound leaves: equal to the sum of their parts?

Champagne¹,

Sinha²

2004

Development

102

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The leaves of seed plants can be classified as being either simple or compound according to their shape. Two hypotheses address the homology between simple and compound leaves, which equate either individual leaflets of compound leaves with simple leaves or the entire compound leaf with a simple leaf. Here we discuss the genes that function in simple and compound leaf development, such as KNOX1 genes, including how they interact with growth hormones to link growth regulation and development to cause changes in leaf complexity. Studies of transcription factors that control leaf development, their downstream targets, and how these targets are regulated are areas of inquiry that should increase our understanding of how leaf complexity is regulated and how it evolved through time. Summary

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Roles for auxin during morphogenesis of the compound leaves of pea ( Pisum sativum )

Abstract: Owing to problems during data transfer, Fig. 10 contained errors. The correct version is given below.

Cited by 24 publications

References 0 publications

Auxin patternsSolanum lycopersicumleaf morphogenesis

Auxin patternsSolanum lycopersicumleaf morphogenesis

YUCCAGenes Are Expressed in Response to Leaf Adaxial-Abaxial Juxtaposition and Are Required for Leaf Margin Development

Compound leaves: equal to the sum of their parts?

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