RNA processing/modifying enzymes play key roles in the response to thermospermine in <i>Arabidopsis thaliana</i>

Takahashi, Taku; Tanaka, Takahiro; Koyama, Daiki; Saraumi, Mitsuru; Motose, Hiroyasu

doi:10.1101/2022.09.19.508594

Cited by 3 publications

(2 citation statements)

References 55 publications

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“…The bHLH transcription factors SAC51, SACL1, and SACL2 that participate in the ACL5-auxin feedback loop are also absent 48 . While SACL3 is retained, PHIP1 49 is lost, which could enhance acl5 dwarfism, producing the “tiny-plant” phenotype found in acl5 sacl3 mutants of Arabidopsis 48 . WOX4 is also absent, which regulates cell division in the procambium 50 , and together with downstream factors such as ATHB-8, likely contributes to the dramatic simplification of the vascular bundle in Lemnaceae 34 .…”

Section: Resultsmentioning

confidence: 99%

The genomes and epigenomes of aquatic plants (Lemnaceae) promote triploid hybridization and clonal reproduction

Ernst

Abramson

Acosta

et al. 2023

Preprint

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The Lemnaceae (duckweeds) are the world's smallest but fastest growing flowering plants, with a drastically reduced morphology and predominant clonal reproductive habit capable of continuous exponential growth. Here, we present assemblies of 10Lemnachromosome sets by single molecule nanopore sequencing and chromosome conformation capture. Dynamics of genome evolution in the family are revealed by syntenic comparisons withWolffiaandSpirodela, and diversification of these genera was found to coincide with the "Azolla event", in which blooms of aquatic macrophytes reduced atmospheric CO2from greenhouse levels found in the Eocene to those of the current ice age. Orthologous gene comparisons with other aquatic and terrestrial plants uncovered candidate genes for the unique metabolic and developmental features of the family, such as frequent hybrid polyploidy, lack of stomatal closure in high CO2, and accumulation of calcium oxalate, a promising candidate for carbon sequestration. Loss of a spermine-triggered gene network may account for drastic reduction in stature and preferentially adaxial stomata, a feature of floating aquatic plants. Strikingly, Lemnaceae genomes have selectively lost some of the genes required for RNA interference, including Argonaute genes required for post- zygotic reproductive isolation (the triploid block) and reduced gamete formation. Triploid hybrids arise commonly amongLemna, presumably by hybridization with unreduced gametes, and we have found mutations in highly-conserved ZMM crossover pathway genes that could support polyploid meiosis. Rapid but stable clonal propagation makesLemnaan ideal platform for continuous protein and starch micro-cropping, and for efficient sequestration of dissolved nutrients and atmospheric CO2. Facile regeneration of transgenic fronds from tissue culture, aided by reduced epigenetic silencing, makesLemnaa powerful biotechnological platform, as exemplified by recent engineering of high-oilLemnathat out-perform oil seed crops.

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Section: Resultsmentioning

confidence: 99%

The genomes and epigenomes of aquatic plants (Lemnaceae) promote triploid hybridization and clonal reproduction

Ernst

Abramson

Acosta

et al. 2023

Preprint

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“…Manipulating the PA content in plants by exogenous application or metabolic engineering has shown that PAs are involved in embryogenesis, fruit development and maturation, flower and chloroplast development, organogenesis, and senescence and stress responses. TSpm, for example, controls stem elongation in A. thaliana by promoting the expression of upstream open reading frames (uORFs) that control translation of genes involved in xylem differentiation, which affects stem elongation [ 79 , 144 ]. In fact, some genes required for plant PA biosynthesis are regulated by uORFs, probably in response to specific PAs [ 145 ].…”

Section: A Brief Review Of the Roles Of Polyamines In Plantsmentioning

confidence: 99%

The Biosynthesis and Functions of Polyamines in the Interaction of Plant Growth-Promoting Rhizobacteria with Plants

Dunn

Becerra-Rivera

2023

Plants

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Plant growth-promoting rhizobacteria (PGPR) are members of the plant rhizomicrobiome that enhance plant growth and stress resistance by increasing nutrient availability to the plant, producing phytohormones or other secondary metabolites, stimulating plant defense responses against abiotic stresses and pathogens, or fixing nitrogen. The use of PGPR to increase crop yield with minimal environmental impact is a sustainable and readily applicable replacement for a portion of chemical fertilizer and pesticides required for the growth of high-yielding varieties. Increased plant health and productivity have long been gained by applying PGPR as commercial inoculants to crops, although with uneven results. The establishment of plant–PGPR relationships requires the exchange of chemical signals and nutrients between the partners, and polyamines (PAs) are an important class of compounds that act as physiological effectors and signal molecules in plant–microbe interactions. In this review, we focus on the role of PAs in interactions between PGPR and plants. We describe the basic ecology of PGPR and the production and function of PAs in them and the plants with which they interact. We examine the metabolism and the roles of PAs in PGPR and plants individually and during their interaction with one another. Lastly, we describe some directions for future research.

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The Biosynthesis and Functions of Polyamines in the Interaction of Plant Growth-Promoting Rhizobacteria with Plants

Dunn,

Becerra-Rivera

2023

Preprint

View full text Add to dashboard Cite

Plant growth-promoting rhizobacteria (PGPR) are members of the plant rhizomicrobiome that enhance plant growth and stress resistance by increasing nutrient availability to the plant, producing phytohormones or other secondary metabolites, stimulating plant defense responses against abiotic stresses and pathogens, or fixing nitrogen. The use of PGPR to increase crop yield with minimal environmental impact is a sustainable and readily applicable replacement for a portion of chemical fertilizer and pesticides required for the growth of high-yielding varieties. Increased plant health and productivity have long been gained by applying PGPR as commercial inoculants to crops, although with uneven results. The establishment of plant-PGPR relationships requires the exchange of chemical signals and nutrients between the partners, and polyamines (PAs) are an important class of compounds that act as physiological effectors and signal molecules in plant-microbe interactions. In this review we focus on the role of PAs in interactions between PGPR and plants. We describe the basic ecology of PGPR and production and function of PAs in them and in the plants with which they interact. We examine the metabolism and the roles of PAs in PGPR and plants individually and during their interaction with one another. Lastly, we describe some directions for future research.

show abstract

RNA processing/modifying enzymes play key roles in the response to thermospermine in Arabidopsis thaliana

Cited by 3 publications

References 55 publications

The genomes and epigenomes of aquatic plants (Lemnaceae) promote triploid hybridization and clonal reproduction

The genomes and epigenomes of aquatic plants (Lemnaceae) promote triploid hybridization and clonal reproduction

The Biosynthesis and Functions of Polyamines in the Interaction of Plant Growth-Promoting Rhizobacteria with Plants

The Biosynthesis and Functions of Polyamines in the Interaction of Plant Growth-Promoting Rhizobacteria with Plants

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