The Arabidopsis <i>ARGOS‐LIKE</i> gene regulates cell expansion during organ growth

Hu, Yuxin; Poh, Huay Mei; Chua, Nam‐Hai

doi:10.1111/j.1365-313x.2006.02750.x

Cited by 189 publications

(136 citation statements)

References 49 publications

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“…4B) (16-18). Reduced expression of ARL results in decreased size of cotyledons, whereas overexpression of ARL leads to an increase in cotyledon size (18). The cotyledon areas of SAUR50 and SAUR65 overexpression lines were significantly larger than wild-type cotyledons (16) and overexpression of SAUR76, SAUR77, or SAUR78 showed increased plant size (17).…”

Section: Significancementioning

confidence: 99%

PIF4-controlled auxin pathway contributes to hybrid vigor in Arabidopsis thaliana

Wang

Greaves

et al. 2017

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

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F1 hybrids in Arabidopsis and crop species are uniform and high yielding. The F2 generation loses much of the yield advantage and the plants have heterogeneous phenotypes. We generated pure breeding hybrid mimic lines by recurrent selection and also selected a pure breeding small phenotype line. The hybrid mimics are almost completely homozygous with chromosome segments from each parent. Four particular chromosomal segments from C24 and 8 from Ler were present in all of the hybrid mimic lines, whereas in the F6 small phenotype line, the 12 segments were each derived from the alternative parent. Loci critical for promoting hybrid vigor may be contained in each of these 12 conserved segments. We have identified genes with similar altered expression in hybrid mimics and F1 plants but not in the small phenotype line. These genes may be critical for the generation of hybrid vigor. Analysis of transcriptomes indicated that increased expression of the transcription factor PHYTOCHROME-INTERACTING FACTOR (PIF4) may contribute to hybrid vigor by targeting the auxin biosynthesis gene YUCCA8 and the auxin signaling gene IAA29. A number of auxin responsive genes promoting leaf growth were up-regulated in the F1 hybrids and hybrid mimics, suggesting that increased auxin biosynthesis and signaling contribute to the hybrid phenotype. The hybrid mimic seeds had earlier germination as did the seeds of the F1 hybrids, indicating cosegregation of the genes for rosette size and the germination trait. Early germination may be an indicator of vigorous hybrids.heterosis | transcription factor | biomass | transregulation | germination T wo features common to hybrids in many crops are the increased yield and phenotypic uniformity of the F1 hybrid generation and the reduced yield and phenotypic heterogeneity of the F2 generation (1). These characteristics also apply to the F1 and F2 populations in Arabidopsis hybrids (2). The processes of capture of light and assimilation of CO 2 into photosynthate are the same in the hybrid and parents and as the hybrids have larger leaves than their parents, they produce more photosynthate (3).In a previous paper (2), transcriptome analyses showed that in the hybrids, most genes are expressed at the same levels as in the parents. Compared with the average level of gene expression in the parents, ∼2,000 genes (6% of the genome) have altered expression in the hybrids and are likely to be involved in the generation of the hybrid vigor phenotype. Many of the differentially expressed genes (DEGs) encode proteins in key metabolic pathways such as the plant hormone systems auxin and salicylic acid (SA) and the basal defense response, suggesting that these pathways contribute to the development of hybrid vigor (4). Altered hormone abscisic acid (ABA) and defense response have also been reported in rice hybrids (5). Despite the contrasting phenotypes of the F1 and F2 populations, we were able to develop "pure breeding" F5/F6 lines with phenotypes comparable to the F1 hybrids (hybrid mimics) (2). The hybrid mimic...

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Section: Significancementioning

confidence: 99%

PIF4-controlled auxin pathway contributes to hybrid vigor in Arabidopsis thaliana

Wang

Greaves

et al. 2017

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

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“…For example, LW was associated with three LL pathway genes, BrARGOS_A09, BrARL_A03, and BrKRP2_A03.2. Among of them, BrARGOS_A09 and BrARL_A03 influence cell size and are up-regulated by brassinosteroids (Hu et al, 2006;Feng et al, 2011), while another report describes that auxin acts via the ARGOS protein to regulate leaf size (Hay et al, 2004). BrKRP2_A03.2 was involved in the regulation of cell proliferation and postmitotic cell expansion to control organ size in Arabidopsis (Kawade et al, 2010).…”

Section: Bayesian Network Analysis To Identify Genes Regulating Phenomentioning

confidence: 99%

Genetic Dissection of Leaf Development in Brassica rapa Using a Genetical Genomics Approach

et al. 2014

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The paleohexaploid crop Brassica rapa harbors an enormous reservoir of morphological variation, encompassing leafy vegetables, vegetable and fodder turnips (Brassica rapa, ssp. campestris), and oil crops, with different crops having very different leaf morphologies. In the triplicated B. rapa genome, many genes have multiple paralogs that may be regulated differentially and contribute to phenotypic variation. Using a genetical genomics approach, phenotypic data from a segregating doubled haploid population derived from a cross between cultivar Yellow sarson (oil type) and cultivar Pak choi (vegetable type) were used to identify loci controlling leaf development. Twenty-five colocalized phenotypic quantitative trait loci (QTLs) contributing to natural variation for leaf morphological traits, leaf number, plant architecture, and flowering time were identified. Genetic analysis showed that four colocalized phenotypic QTLs colocalized with flowering time and leaf trait candidate genes, with their cis-expression QTLs and cisor trans-expression QTLs for homologs of genes playing a role in leaf development in Arabidopsis (Arabidopsis thaliana). The leaf gene BRASSICA RAPA KIP-RELATED PROTEIN2_A03 colocalized with QTLs for leaf shape and plant height; BRASSICA RAPA ERECTA_A09 colocalized with QTLs for leaf color and leaf shape; BRASSICA RAPA LONGIFOLIA1_A10 colocalized with QTLs for leaf size, leaf color, plant branching, and flowering time; while the major flowering time gene, BRASSICA RAPA FLOWERING LOCUS C_A02, colocalized with QTLs explaining variation in flowering time, plant architectural traits, and leaf size. Colocalization of these QTLs points to pleiotropic regulation of leaf development and plant architectural traits in B. rapa.Six Brassica species are cultivated worldwide: three diploid Brassica species, Brassica rapa (A genome; n = 10), Brassica nigra (B genome; n = 8), and Brassica oleracea (C genome; n = 9), and three amphidiploids, Brassica juncea (AB; n = 18), Brassica napus (AC; n = 19), and Brassica carinata (BC; n = 17), derived by spontaneous hybridization among the three diploid species (Nagaharu, 1935). All diploid Brassica species have undergone a whole-genome triplication since their divergence from Arabidopsis (Arabidopsis thaliana; Lysak et al., 2005;Town et al.,

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“…To further understand how med25 mutants affect cell expansion, we examined the expression levels of other characterized Arabidopsis genes involved in cell expansion, including ROT3 (Kim et al, 1998), AN (Kim et al, 2002), AtAF2 (Delessert et al, 2005), BPEp (Szecsi et al, 2006) and ARL (Hu et al, 2006). Their expression was not significantly changed in med25-2 inflorescences, suggesting that the role of MED25 in regulating cell expansion does not involve ROT3, AN, AtAF2, BPEp and ARL at the mRNA level (see Fig.…”

Section: Increased Expression Of Expansin Genes In Med25-2mentioning

confidence: 99%

Control of final organ size by Mediator complex subunit 25 in Arabidopsis thaliana

2011

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Control of organ size by cell proliferation and cell expansion is a fundamental developmental process, but the mechanisms that establish the final size of organs and whole organisms remain elusive in plants and animals. We have previously demonstrated that DA1, which encodes a predicted ubiquitin receptor, controls the final size of seeds and organs by restricting cell proliferation in Arabidopsis. Through a genetic screen for mutations that enhance the floral organ size of da1-1, we have identified an enhancer of da1-1 (eod8-1). The eod8-1 mutation was identified, using a map-based cloning approach, in Mediator complex subunit 25 (MED25; also known as PFT1), which is involved in the transcriptional regulation of gene expression. Loss-of-function mutants in MED25 form large organs, with larger and slightly increased numbers of cells as a result of an increased period of cell proliferation and cell expansion, whereas plants overexpressing MED25 have small organs owing to decreases in both cell number and cell size. Our genetic and physiological data suggest that MED25 acts to limit cell and organ growth independently of MED25-mediated phytochrome signaling and the jasmonate pathway. Genetic analyses show that MED25 functions redundantly with DA1 to control organ growth by restricting cell proliferation. Collectively, our findings show that MED25 plays a crucial role in setting final organ size, suggesting that it constitutes an important point of regulation in plant organ size control within the transcriptional machinery.

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The Arabidopsis ARGOS‐LIKE gene regulates cell expansion during organ growth

Cited by 189 publications

References 49 publications

PIF4-controlled auxin pathway contributes to hybrid vigor in Arabidopsis thaliana

PIF4-controlled auxin pathway contributes to hybrid vigor in Arabidopsis thaliana

Genetic Dissection of Leaf Development in Brassica rapa Using a Genetical Genomics Approach

Control of final organ size by Mediator complex subunit 25 in Arabidopsis thaliana

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