A modular concept of phenotypic plasticity in plants

Kroon, Hans de; Huber, Heidrun; Stuefer, Josef F.; Groenendael, J.M. van

doi:10.1111/j.1469-8137.2004.01310.x

Cited by 391 publications

(361 citation statements)

References 82 publications

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“…Modular integration, also regarding root responses, has been observed before, 31 but the surprising effect of s/ns discrimination as reported here is that physiological integration is a prerequisite for the discriminatory root responses to occur. This communication may be mediated by hormones such as auxin and cytokinins, with the shoot as an intermediary.…”

Section: Discussionmentioning

confidence: 74%

Physiologically-Mediated Self/Non-Self Root Discrimination inTrifolium repenshas Mixed Effects on Plant Performance

Falik

Kroon

Novoplansky

2006

Plant Signaling & Behavior

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Recent studies suggest that plant roots can avoid competition with other roots of the same plant, but the mechanism behind this behavior is yet largely unclear and their effects on plant performance hardly studied. We grew combinations of two ramets of Trifolium repens in a single pot that were either intact, disconnected for a shorter or longer time, or that belonged to different genotypes. Interconnected ramets developed lower root length and mass than any other combination of ramets, supporting the notion that self/non-self discrimination in T. repens was based entirely on physiological coordination between different roots that develop on the same plant, rather than biochemical allorecognition. These responses were consistent among eight field-collected genotypes, suggesting that self/non-self discrimination is a common feature in wild populations of white clover. There were no significant treatment x genotype interactions suggesting that genetic variation for self/non-self discrimination may be limited. Self-interactions resulted in lower to similar shoot biomass and number of ramets, but higher flowering probabilities, compared to non-self interactions. Thus, our results demonstrated that the performance consequences of self/non-self discrimination may be more complicated than previously thought.

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Section: Discussionmentioning

confidence: 74%

Physiologically-Mediated Self/Non-Self Root Discrimination inTrifolium repenshas Mixed Effects on Plant Performance

Falik

Kroon

Novoplansky

2006

Plant Signaling & Behavior

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“…Sessile organisms might benefit from modularity and the spatial expansion of the individual via enhanced resource capture, and thereby improved growth and survival (1)(2)(3). However, growth and survival are only two of the key components of an organism's life history, and the third, reproduction, is the one that is most intimately linked to fitness.…”

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confidence: 99%

Consequences of clonality for sexual fitness: Clonal expansion enhances fitness under spatially restricted dispersal

Drunen

Kleunen

Dorken

2015

Proc. Natl. Acad. Sci. U.S.A.

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Clonality is a pervasive feature of sessile organisms, but this form of asexual reproduction is thought to interfere with sexual fitness via the movement of gametes among the modules that comprise the clone. This within-clone movement of gametes is expected to reduce sexual fitness via mate limitation of male reproductive success and, in some cases, via the production of highly inbred (i.e., self-fertilized) offspring. However, clonality also results in the spatial expansion of the genetic individual (i.e., genet), and this should decrease distances gametes and sexually produced offspring must travel to avoid competing with other gametes and offspring from the same clone. The extent to which any negative effects of clonality on mating success might be offset by the positive effects of spatial expansion is poorly understood. Here, we develop spatially explicit models in which fitness was determined by the success of genets through their male and female sex functions. Our results indicate that clonality serves to increase sexual fitness when it is associated with the outward expansion of the genet. Our models further reveal that the main fitness benefit of clonal expansion might occur through the dispersal of offspring over a wider area compared with nonclonal phenotypes. We conclude that, instead of interfering with sexual reproduction, clonal expansion should often serve to enhance sexual fitness.asexual reproduction | geitonogamy | genet | modularity | ramet M odular growth, clonality, and hermaphroditism are widespread features of sessile organisms. Sessile organisms might benefit from modularity and the spatial expansion of the individual via enhanced resource capture, and thereby improved growth and survival (1-3). However, growth and survival are only two of the key components of an organism's life history, and the third, reproduction, is the one that is most intimately linked to fitness. Indeed, during reproduction, the growth of a modular hermaphrodite might interfere with its success as a parent. In particular, it has been argued that the production of numerous partially or fully autonomous clonal modules (i.e., ramets) should interfere with mating success because there is a nonzero chance that sperm (or pollen) will encounter the receptive tissues associated with the female function of the same genetic individual (i.e., the genet). All else being equal, the larger the clone, the greater the chance that this kind of mating interference should occur (4, 5). The negative effects of such intraclonal mating is expected to occur through reductions in the number of offspring sired on other genets (i.e., outcross siring success, corresponding with the fitness of individuals via their male function) and, in self-compatible organisms, through inbreeding depression (i.e., a reduction in offspring fitness, with negative effects on the fitness of individuals through their female function; e.g., ref. 5). However, these forms of mating interference are simply by-products of attaining a larger size and are not exclusiv...

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“…CDK inhibitor | cell proliferation | histone modification P lant development is characterized by an astonishing plasticity, instrumental for responses to environmental changes (1). Variability in plant growth is primarily based on the regulation of postembryonic development, giving rise to the formation of organs that derive from meristem-localized stem cell niches (2,3).…”

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confidence: 99%

Putative Arabidopsis Transcriptional Adaptor Protein (PROPORZ1) is required to modulate histone acetylation in response to auxin

Moulinier-Anzola

Sieberer

Ortbauer

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

107

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Plant development is highly adaptable and controlled by a combination of various regulatory circuits that integrate internal and environmental cues. The phytohormone auxin mediates such growth responses, acting as a dynamic signal in the control of morphogenesis via coordinating the interplay between cell cycle progression and cell differentiation. Mutants in the chromatin-remodeling component PROPORZ1 (PRZ1; also known as AtADA2b) are impaired in auxin effects on morphogenesis, suggestive of an involvement of PRZ1-dependent control of chromatin architecture in the determination of hormone responses. Here we demonstrate that PRZ1 is required for accurate histone acetylation at auxin-controlled loci. Specifically, PRZ1 is involved in the modulation of histone modifications and corresponding adjustments in gene expression of Arabidopsis KIP RELATED PROTEIN ( KRP ) CDK inhibitor genes in response to auxin. Deregulated KRP expression in KRP silencer lines phenocopies prz1 hyperproliferative growth phenotypes, whereas in a KRP overexpression background some mutant phenotypes are suppressed. Collectively, our findings support a model in which translation of positional signals into developmental cues involves adjustments in chromatin modifications that orchestrate auxin effects on cell proliferation.

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A modular concept of phenotypic plasticity in plants

Cited by 391 publications

References 82 publications

Physiologically-Mediated Self/Non-Self Root Discrimination inTrifolium repenshas Mixed Effects on Plant Performance

Physiologically-Mediated Self/Non-Self Root Discrimination inTrifolium repenshas Mixed Effects on Plant Performance

Consequences of clonality for sexual fitness: Clonal expansion enhances fitness under spatially restricted dispersal

Putative Arabidopsis Transcriptional Adaptor Protein (PROPORZ1) is required to modulate histone acetylation in response to auxin

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