Plant desiccation gene found in a nematode

Browne, John A.; Tunnacliffe, Alan; Burnell, Ann M.

doi:10.1038/416038a

Cited by 244 publications

(206 citation statements)

References 11 publications

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“…They also accumulate in other desiccation-tolerant organs, pollen and resurrection plant foliage, as they dry and in drought-stressed desiccation-sensitive angiosperms. LEA-like proteins are also found in some bacteria and in nematodes (Browne et al 2002). In contrast to the induced adaptive desiccation of angiosperm resurrection species, the constitutive desiccation tolerance of Tortula ruralis does not involve accumulation of LEA during dehydration but is based on a constant high sucrose content and on synthesis of rehydrin-proteins encoded by RNA transcribed during dehydration and conserved in the dry moss plants (Oliver and Bewley 1997) and presumably other macromolecules essential for revival are also conserved.…”

Section: Desiccation-tolerant Plant Evolution Functional Plant Biologymentioning

confidence: 99%

The evolution of desiccation tolerance in angiosperm plants: a rare yet common phenomenon

Gaff

Oliver²

2013

Functional Plant Biol.

182

176

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Abstract. In a minute proportion of angiosperm species, rehydrating foliage can revive from airdryness or even from equilibration with air of~0% RH. Such desiccation tolerance is known from vegetative cells of some species of algae and of major groups close to the evolutionary path of the angiosperms. It is also found in the reproductive structures of some algae, moss spores and probably the aerial spores of other terrestrial cryptogamic taxa. The occurrence of desiccation tolerance in the seed plants is overwhelmingly in the aerial reproductive structures; the pollen and seed embryos. Spatially and temporally, pollen and embryos are close ontogenetic derivatives of the angiosperm microspores and megaspores respectively. This suggests that the desiccation tolerance of pollen and embryos derives from the desiccation tolerance of the spores of antecedent taxa and that the basic pollen/embryo mechanism of desiccation tolerance has eventually become expressed also in the vegetative tissue of certain angiosperm species whose drought avoidance is inadequate in microhabitats that suffer extremely xeric episodes. The protective compounds and processes that contribute to desiccation tolerance in angiosperms are found in the modern groups related to the evolutionary path leading to the angiosperms and are also present in the algae and in the cyanobacteria. The mechanism of desiccation tolerance in the angiosperms thus appears to have its origins in algal ancestors and possibly in the endosymbiotic cyanobacteria-related progenitor of chloroplasts and the bacteria-related progenitor of mitochondria. The mechanism may involve the regulation and timing of the accumulation of protective compounds and of other contributing substances and processes.

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Section: Desiccation-tolerant Plant Evolution Functional Plant Biologymentioning

confidence: 99%

The evolution of desiccation tolerance in angiosperm plants: a rare yet common phenomenon

Gaff

Oliver²

2013

Functional Plant Biol.

182

176

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“…Besides green plants, sequences coding for LEA-like proteins are present in the genomes of other anhydrobiotic species including microorganisms (Deinococcus radiodurans) and nematodes (Aphelenchus avenae) (see Browne et al, 2002). Thus, during adaptation to land habit, protective mechanisms evolved very early as a common strategy against periodic drought conditions.…”

Section: When Did the Response To Various Hormones Evolve?mentioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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The patterns of phytohormones distribution, their native function and possible origin of hormonal regulation across the green plant lineages (chlorophytes, charophytes, bryophytes and tracheophytes) are discussed. The five classical phytohormonesauxins, cytokinins, gibberellins (GA), abscisic acid (ABA) and ethylene occur ubiquitously in green plants. They are produced as secondary metabolites by microorganisms. Some of the bacterial species use phytohormones to interact with the plant as a part of their colonization strategy. Phytohormone biosynthetic pathways in plants seem to be of microbial origin and furthermore, the origin of high affinity perception mechanism could have preceded the recruitment of a metabolite as a hormone. The bryophytes represent the earliest land plants which respond to the phytohormones with the exception of gibberellins. The regulation by auxin and ABA may have evolved before the separation of green algal lineage. Auxin enhances rhizoid and caulonemal differentiation while cytokinins enhance shoot bud formation in mosses. Ethylene retards cell division but seems to promote cell elongation. The presence of responses specific to cytokinins and ethylene strongly suggest the origin of their regulation in bryophytes. The hormonal role of GAs could have evolved in some of the ferns where antheridiogens (compounds related to GAs) and GAs themselves regulate the formation of antheridia.During migration of life forms to land, the tolerance to desiccation may have evolved and is now observed in some of the microorganisms, animals and plants. Besides plants, sequences coding for late embryogenesis abundant-like proteins occur in the genomes of other anhydrobiotic species of microorganisms and nematodes. ABA acts as a stress signal and increases rapidly upon desiccation or in response to some of the abiotic stresses in green plants. As the salt stress also increases ABA release in the culture medium of cyanobacterium Trichormus variabilis, the recruitment of ABA in the regulation of stress responses could have been derived from prokaryotes and present at the level of common ancestor of green plants. The overall hormonal action mechanisms in mosses are remarkably similar to that of the higher plants. As plants are thought to be monophyletic in origin, the existence of remarkably similar hormonal mechanisms in the mosses and higher plants, suggests that some of the basic elements of regulation cascade could have also evolved at the level of common ancestor of plants. The networking of various steps in a cascade or the crosstalk between different cascades is variable and reflects the dynamic interaction between a species and its specific environment.

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“…These cold-induced transcription factors activate downstream target genes encoding enzymes involved in compatible solute biosynthesis and cold-regulated (COR) proteins, many of which belong to the group of late-embryogenesis abundant (LEA) proteins (Thomashow, 1999;Hundertmark and Hincha, 2008). LEA proteins have been found not only in plants but also in freezing and desiccation-tolerant invertebrates (Browne et al, 2002;Hand et al, 2011).…”

mentioning

confidence: 99%

Disordered Cold Regulated15 Proteins Protect Chloroplast Membranes during Freezing through Binding and Folding, But Do Not Stabilize Chloroplast Enzymes in Vivo

et al. 2014

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Freezing can severely damage plants, limiting geographical distribution of natural populations and leading to major agronomical losses. Plants native to cold climates acquire increased freezing tolerance during exposure to low nonfreezing temperatures in a process termed cold acclimation. This involves many adaptative responses, including global changes in metabolite content and gene expression, and the accumulation of cold-regulated (COR) proteins, whose functions are largely unknown. Here we report that the chloroplast proteins COR15A and COR15B are necessary for full cold acclimation in Arabidopsis (Arabidopsis thaliana). They protect cell membranes, as indicated by electrolyte leakage and chlorophyll fluorescence measurements. Recombinant COR15 proteins stabilize lactate dehydrogenase during freezing in vitro. However, a transgenic approach shows that they have no influence on the stability of selected plastidic enzymes in vivo, although cold acclimation results in increased enzyme stability. This indicates that enzymes are stabilized by other mechanisms. Recombinant COR15 proteins are disordered in water, but fold into amphipathic a-helices at high osmolyte concentrations in the presence of membranes, a condition mimicking molecular crowding induced by dehydration during freezing. X-ray scattering experiments indicate protein-membrane interactions specifically under such crowding conditions. The COR15-membrane interactions lead to liposome stabilization during freezing. Collectively, our data demonstrate the requirement for COR15 accumulation for full cold acclimation of Arabidopsis. The function of these intrinsically disordered proteins is the stabilization of chloroplast membranes during freezing through a folding and binding mechanism, but not the stabilization of chloroplastic enzymes. This indicates a high functional specificity of these disordered plant proteins.

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Plant desiccation gene found in a nematode

Cited by 244 publications

References 11 publications

The evolution of desiccation tolerance in angiosperm plants: a rare yet common phenomenon

The evolution of desiccation tolerance in angiosperm plants: a rare yet common phenomenon

Hormonal regulation in green plant lineage families

Disordered Cold Regulated15 Proteins Protect Chloroplast Membranes during Freezing through Binding and Folding, But Do Not Stabilize Chloroplast Enzymes in Vivo

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