A suite of mutants that modify pattern formation in pea leaves

Marx, Gerard

doi:10.1007/bf02668994

Cited by 110 publications

(108 citation statements)

References 29 publications

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“…In pea, several floral and leaf homeotic genes have been characterized (Domoney et al, 2006), but COCHLEATA (COCH) remains unidentified. Among the pea mutants, coch represents an interesting case because several organ identities, including nodule identity (Voroshilova et al, 2003;Ferguson and Reid, 2005), are modified by the coch mutation (Marx, 1987;Yaxley et al, 2001). Here, we report the isolation and molecular characterization of the NODULE ROOT (NOOT) and COCH genes from M. truncatula and pea, respectively.…”

Section: Introductionmentioning

confidence: 92%

NODULE ROOT and COCHLEATA Maintain Nodule Development and Are Legume Orthologs of Arabidopsis BLADE-ON-PETIOLE Genes

et al. 2012

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During their symbiotic interaction with rhizobia, legume plants develop symbiosis-specific organs on their roots, called nodules, that house nitrogen-fixing bacteria. The molecular mechanisms governing the identity and maintenance of these organs are unknown. Using Medicago truncatula nodule root (noot) mutants and pea (Pisum sativum) cochleata (coch) mutants, which are characterized by the abnormal development of roots from the nodule, we identified the NOOT and COCH genes as being necessary for the robust maintenance of nodule identity throughout the nodule developmental program. NOOT and COCH are Arabidopsis thaliana BLADE-ON-PETIOLE orthologs, and we have shown that their functions in leaf and flower development are conserved in M. truncatula and pea. The identification of these two genes defines a clade in the BTB/POZ-ankyrin domain proteins that shares conserved functions in eudicot organ development and suggests that NOOT and COCH were recruited to repress root identity in the legume symbiotic organ.

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Section: Introductionmentioning

confidence: 92%

NODULE ROOT and COCHLEATA Maintain Nodule Development and Are Legume Orthologs of Arabidopsis BLADE-ON-PETIOLE Genes

et al. 2012

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“…Wild-type pea leaves usually consist of two or three proximal lateral leaflet pairs and three to four distal tendril pairs, followed by a terminal tendril. uni leaves range from being completely simple to being trifoliate (Marx, 1987;Hofer et al, 1997;DeMason and Schmidt, 2001). In all angiosperms studied to date, FLO/LFY orthologs have been found to play a crucial role in flower meristem identity by activating genes that specify whorls of organs within the flower (Coen et al, 1990;Weigel et al, 1992;Souer et al, Development 131 (18) …”

Section: The Role Of Meristem Genesmentioning

confidence: 99%

“…In addition to altered leaf development, the uni pea mutant has compromised floral development. Its transition to flowering is delayed, and when it does produce flowers, they are sterile and consist entirely of sepals and carpels (Marx, 1987;Hofer et al, 1997). Although expression of FLO/LFY is usually seen in vegetative SAMs and leaf primordia, in addition to in floral meristems, in simple leafed plants, such Arabidopsis and petunia, mutation of these genes does not cause altered leaf shape (Weigel et al, 1992;Souer et al, 1998).…”

Section: Box 1 Simple and Compound Leaf Formsmentioning

confidence: 99%

Compound leaves: equal to the sum of their parts?

Champagne¹,

Sinha²

2004

Development

101

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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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“…The wild-type pea leaf is compound oddpinnate; proximal pinnae are leaflets and distal ones tendrils. In addition to that, two leafy stipules flank the petiole base (Marx, 1987). UNI and STP regulate the complexity of the leaf, and mutations in either of them decrease the number of pinnae (Hofer et al, 1997;Taylor et al, 2001).…”

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confidence: 99%

Functional Conservation of PISTILLATA Activity in a Pea Homolog Lacking the PI Motif

et al. 2005

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Current understanding of floral development is mainly based on what we know from Arabidopsis (Arabidopsis thaliana) and Antirrhinum majus. However, we can learn more by comparing developmental mechanisms that may explain morphological differences between species. A good example comes from the analysis of genes controlling flower development in pea (Pisum sativum), a plant with more complex leaves and inflorescences than Arabidopsis and Antirrhinum, and a different floral ontogeny. The analysis of UNIFOLIATA (UNI) and STAMINA PISTILLOIDA (STP), the pea orthologs of LEAFY and UNUSUAL FLORAL ORGANS, has revealed a common link in the regulation of flower and leaf development not apparent in Arabidopsis. While the Arabidopsis genes mainly behave as key regulators of flower development, where they control the expression of B-function genes, UNI and STP also contribute to the development of the pea compound leaf. Here, we describe the characterization of P. sativum PISTILLATA (PsPI), a pea MADS-box gene homologous to B-function genes like PI and GLOBOSA (GLO), from Arabidopsis and Antirrhinum, respectively. PsPI encodes for an atypical PI-type polypeptide that lacks the highly conserved C-terminal PI motif. Nevertheless, constitutive expression of PsPI in tobacco (Nicotiana tabacum) and Arabidopsis shows that it can specifically replace the function of PI, being able to complement the strong pi-1 mutant. Accordingly, PsPI expression in pea flowers, which is dependent on STP, is identical to PI and GLO. Interestingly, PsPI is also transiently expressed in young leaves, suggesting a role of PsPI in pea leaf development, a possibility that fits with the established role of UNI and STP in the control of this process.A huge variety of inflorescence and floral morphologies are found among higher plants. Increasing attention is currently being paid to the study of the mechanisms responsible for this natural diversity. Recent advances in plant molecular genetics have allowed detailed comparative studies on how the development of equivalent organs and structures is regulated in different plants. An important conclusion of these studies is that most of the genetic functions that establish the general pattern for organ specification are executed by orthologous genes in the different species and, more importantly, that the observed morphological variation is achieved in a large degree through the modification of the function of those regulators in each particular species (Theissen et al., 2000).A clear example of conservation is the specification of the identity of floral organs. The classical ABC model proposes that floral organ identity results from the action of three genetic functions, A, B, and C, each of them active in two adjacent whorls of organs. Afunction alone specifies sepal identity, A plus B petal identity, B plus C stamens, and C alone carpels. The ABC model was developed on the basis of studies carried out in the model plants Arabidopsis (Arabidopsis thaliana) and Antirrhinum majus (Coen and Meyerowitz, 1991), two ...

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A suite of mutants that modify pattern formation in pea leaves

Cited by 110 publications

References 29 publications

NODULE ROOT and COCHLEATA Maintain Nodule Development and Are Legume Orthologs of Arabidopsis BLADE-ON-PETIOLE Genes

NODULE ROOT and COCHLEATA Maintain Nodule Development and Are Legume Orthologs of Arabidopsis BLADE-ON-PETIOLE Genes

Compound leaves: equal to the sum of their parts?

Functional Conservation of PISTILLATA Activity in a Pea Homolog Lacking the PI Motif

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