KNOX2 Genes Regulate the Haploid-to-Diploid Morphological Transition in Land Plants

Sakakibara, Keiko; Ando, Sayuri; Yip, Hoichong Karen; Tamada, Yosuke; Hiwatashi, Yuji; Murata, Takashi; Deguchi, Hiroyuki; Bowman, John L.

doi:10.1126/science.1230082

Cited by 135 publications

(158 citation statements)

References 32 publications

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“…Hence, in a developmental comparison of homologous structures between non-vascular and vascular plants, moss gametophytes correspond to flowering plant gametophytes, i.e., the pollen and the embryo sac. At the molecular level, the developmental programs underlying the gametophyte and sporophyte body plans are often not synapomorphies of land plants and rely on different mechanisms (Sakakibara et al 2013).…”

Section: Mosses Are Haploid Dominantmentioning

confidence: 99%

Can mosses serve as model organisms for forest research?

Müller

Gütle

Jacquot

et al. 2016

Annals of Forest Science

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& Key message Based on their impact on many ecosystems, we review the relevance of mosses in research regarding stress tolerance, metabolism, and cell biology. We introduce the potential use of mosses as complementary model systems in molecular forest research, with an emphasis on the most developed model moss Physcomitrella patens. & Context and aims Mosses are important components of several ecosystems. The moss P. patens is a well-established nonvascular model plant with a high amenability to molecular biology techniques and was designated as a JGI plant flagship genome. In this review, we will provide an introduction to moss research and highlight the characteristics of P. patens and other mosses as a potential complementary model system for forest research. & Methods Starting with an introduction into general moss biology, we summarize the knowledge about moss physiology and differences to seed plants. We provide an overview of the current research areas utilizing mosses, pinpointing potential links to tree biology. To complement literature review, we discuss moss advantages and available resources regarding molecular biology techniques. & Results and conclusion During the last decade, many fundamental processes and cell mechanisms have been studied in mosses and seed plants, increasing our knowledge of plant evolution. Additionally, moss-specific mechanisms of stress tolerance are under investigation to understand their resilience in ecosystems. Thus, using the advantages of model mosses such as P. patens is of high interest for various research approaches, including stress tolerance, organelle biology, cell polarity, and secondary metabolism.

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Section: Mosses Are Haploid Dominantmentioning

confidence: 99%

Can mosses serve as model organisms for forest research?

Müller

Gütle

Jacquot

et al. 2016

Annals of Forest Science

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“…Interestingly, the genetic program that directs sporophyte development in the bryophyte moss Physcomitrella is directed by a KNOX family homeodomain transcription factor whose homologs in the chlorophyte alga C. reinhardtii direct development of the dormant diploid zygospore formed after fertilization (Lee et al 2008;Nishimura et al 2012;Sakakibara et al 2013). The role of these homeodomain proteins in charophyte algae has not been examined, but they are predicted to participate in zygote development.…”

Section: Multicellular Innovations In Land Plants That May Be Rootedmentioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

108

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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“…Recently, Sakakibara et al (2013) demonstrated that inactivation of moss class 2 KNOTTED LIKE HOMEO-BOX (KNOX2) transcription factors induce the development of gametophyte leafy shoots from diploid embryos without meiosis, suggesting that PpKNOX2 acts to prevent the haploid-specific body plan from developing in the diploid phase. This result is intriguing, as it may suggest that loss of such a pathway potentially could have aided in the recruitment of haploid genetic tool kits into the diploid generation.…”

mentioning

confidence: 99%

The MossPhyscomitrella patensReproductive Organ Development Is Highly Organized, Affected by the TwoSHI/STYGenes and by the Level of Active Auxin in theSHI/STYExpression Domain

et al. 2013

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In order to establish a reference for analysis of the function of auxin and the auxin biosynthesis regulators SHORT INTERNODE/ STYLISH (SHI/STY) during Physcomitrella patens reproductive development, we have described male (antheridial) and female (archegonial) development in detail, including temporal and positional information of organ initiation. This has allowed us to define discrete stages of organ morphogenesis and to show that reproductive organ development in P. patens is highly organized and that organ phyllotaxis differs between vegetative and reproductive development. Using the PpSHI1 and PpSHI2 reporter and knockout lines, the auxin reporters GmGH3 pro :GUS and PpPINA pro :GFP-GUS, and the auxin-conjugating transgene PpSHI2 pro :IAAL, we could show that the PpSHI genes, and by inference also auxin, play important roles for reproductive organ development in moss. The PpSHI genes are required for the apical opening of the reproductive organs, the final differentiation of the egg cell, and the progression of canal cells into a cell death program. The apical cells of the archegonium, the canal cells, and the egg cell are also sites of auxin responsiveness and are affected by reduced levels of active auxin, suggesting that auxin mediates PpSHI function in the reproductive organs.

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KNOX2 Genes Regulate the Haploid-to-Diploid Morphological Transition in Land Plants

Cited by 135 publications

References 32 publications

Can mosses serve as model organisms for forest research?

Can mosses serve as model organisms for forest research?

Green Algae and the Origins of Multicellularity in the Plant Kingdom

The MossPhyscomitrella patensReproductive Organ Development Is Highly Organized, Affected by the TwoSHI/STYGenes and by the Level of Active Auxin in theSHI/STYExpression Domain

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