Going with the wind – Adaptive dynamics of plant secondary meristems

Agustí, Javier; Greb, Thomas

doi:10.1016/j.mod.2012.05.011

Cited by 40 publications

(31 citation statements)

References 113 publications

(68 reference statements)

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“…SLs were proposed to be central modulators of shoot architecture by modulating and coordinating shoot branching and secondary growth (Agusti and Greb, 2013). This study emphasizes the role of SLs in repressing or inducing the activities of different types of meristems to adjust shoot architecture to environmental conditions.…”

Section: Resultsmentioning

confidence: 94%

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Strigolactones Stimulate Internode Elongation Independently of Gibberellins

et al. 2013

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Strigolactone (SL) mutants in diverse species show reduced stature in addition to their extensive branching. Here, we show that this dwarfism in pea (Pisum sativum) is not attributable to the strong branching of the mutants. The continuous supply of the synthetic SL GR24 via the root system using hydroponics can restore internode length of the SL-deficient rms1 mutant but not of the SL-response rms4 mutant, indicating that SLs stimulate internode elongation via RMS4. Cytological analysis of internode epidermal cells indicates that SLs control cell number but not cell length, suggesting that SL may affect stem elongation by stimulating cell division. Consequently, SLs can repress (in axillary buds) or promote (in the stem) cell division in a tissuedependent manner. Because gibberellins (GAs) increase internode length by affecting both cell division and cell length, we tested if SLs stimulate internode elongation by affecting GA metabolism or signaling. Genetic analyses using SL-deficient and GAdeficient or DELLA-deficient double mutants, together with molecular and physiological approaches, suggest that SLs act independently from GAs to stimulate internode elongation.

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Section: Resultsmentioning

confidence: 94%

“…We have shown by exogenous SL applications that control of branching and internode elongation can be independent. Whether, in natural conditions, these multiple actions of SLs are coordinated or not needs further investigation (Agusti and Greb, 2013).…”

Section: Resultsmentioning

confidence: 99%

Strigolactones Stimulate Internode Elongation Independently of Gibberellins

et al. 2013

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“…In situ hybridization of D14 mRNA and immunolocalization of the D14 protein will help elucidate these possibilities. In some other tissues, such as the shoot cambium, where MAX2 has been shown to play an essential role (Agusti and Greb, 2013), the D14 protein does not accumulate measurably. One possibility is that MAX2 does not interact with D14 for this function; alternatively, small, belowdetection amounts of D14, which perhaps is degraded rapidly after the interaction, are sufficient to trigger SL signaling in this tissue.…”

Section: Spatial Regulation Of Sl Signalingmentioning

confidence: 99%

Strigolactone Promotes Degradation of DWARF14, an α/β Hydrolase Essential for Strigolactone Signaling inArabidopsis

et al. 2014

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Strigolactones (SLs) are phytohormones that play a central role in regulating shoot branching. SL perception and signaling involves the F-box protein MAX2 and the hydrolase DWARF14 (D14), proposed to act as an SL receptor. We used strong loss-offunction alleles of the Arabidopsis thaliana D14 gene to characterize D14 function from early axillary bud development through to lateral shoot outgrowth and demonstrated a role of this gene in the control of flowering time. Our data show that D14 distribution in vivo overlaps with that reported for MAX2 at both the tissue and subcellular levels, allowing physical interactions between these proteins. Our grafting studies indicate that neither D14 mRNA nor the protein move over a long range upwards in the plant. Like MAX2, D14 is required locally in the aerial part of the plant to suppress shoot branching. We also identified a mechanism of SLinduced, MAX2-dependent proteasome-mediated degradation of D14. This negative feedback loop would cause a substantial drop in SL perception, which would effectively limit SL signaling duration and intensity.

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“…Tillering or vegetative branching is one of the most important components of shoot architecture in cereals because it contributes directly to grain yield (Kebrom et al, 2013;Hussien et al, 2014) and is involved in plant plasticity in response to environmental cues and stresses (Mohapatra et al, 2011;Agusti and Greb, 2013). The shoot apical meristem initiates a series of repetitive units called phytomers, each consisting of a leaf, a node, an internode, and an axillary meristem (AXM) located in the axil between the leaf and the shoot axis (Sussex, 1989).…”

mentioning

confidence: 99%

The Barley Uniculme4 Gene Encodes a BLADE-ON-PETIOLE-Like Protein That Controls Tillering and Leaf Patterning

et al. 2015

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Tillers are vegetative branches that develop from axillary buds located in the leaf axils at the base of many grasses. Genetic manipulation of tillering is a major objective in breeding for improved cereal yields and competition with weeds. Despite this, very little is known about the molecular genetic bases of tiller development in important Triticeae crops such as barley (Hordeum vulgare) and wheat (Triticum aestivum). Recessive mutations at the barley Uniculme4 (Cul4) locus cause reduced tillering, deregulation of the number of axillary buds in an axil, and alterations in leaf proximal-distal patterning. We isolated the Cul4 gene by positional cloning and showed that it encodes a BROAD-COMPLEX, TRAMTRACK, BRIC-À-BRAC-ankyrin protein closely related to Arabidopsis (Arabidopsis thaliana) BLADE-ON-PETIOLE1 (BOP1) and BOP2. Morphological, histological, and in situ RNA expression analyses indicate that Cul4 acts at axil and leaf boundary regions to control axillary bud differentiation as well as the development of the ligule, which separates the distal blade and proximal sheath of the leaf. As, to our knowledge, the first functionally characterized BOP gene in monocots, Cul4 suggests the partial conservation of BOP gene function between dicots and monocots, while phylogenetic analyses highlight distinct evolutionary patterns in the two lineages.

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Going with the wind – Adaptive dynamics of plant secondary meristems

Cited by 40 publications

References 113 publications

Strigolactones Stimulate Internode Elongation Independently of Gibberellins

Strigolactones Stimulate Internode Elongation Independently of Gibberellins

Strigolactone Promotes Degradation of DWARF14, an α/β Hydrolase Essential for Strigolactone Signaling inArabidopsis

The Barley Uniculme4 Gene Encodes a BLADE-ON-PETIOLE-Like Protein That Controls Tillering and Leaf Patterning

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