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Learning from Evolution： Thellungiella Generates New Knowledge on Essential and Critical Components of Abiotic Stress Tolerance in Plants

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Molecular Plant 2009年第1期2卷 3-12页

作者： anna amtmann Plant Science Group FBLS University of Glasgow Glasgow G12 8QQ UK

Thellungiella salsuginea （halophila） is a close relative of Arabidopsis thaliana but, unlike A. thaliana, it grows well in extreme conditions of cold, salt, and drought as well as nitrogen limitation. Over the last decade, many laboratories have started to use Thellungiella to investigate the physiological, metabolic, and molecular mechanisms of abiotic stress tolerance in plants, and new knowledge has been gained in particular with respect to ion transport and gene expression. The advantage of Thellungiella over other extremophile model plants is that it can be directly compared with Arabidopsis, and therefore generate information on both essential and critical components of stress tolerance. Thellungiella research is supported by a growing body of technical resources comprising physiological and molecular protocols, ecotype collections, expressed sequence tags, cDNA-libraries, microarrays, and a pending genome sequence. This review summarizes the current state of knowledge on Thellungiella and re-evaluates its usefulness as a model for research into plant stress tolerance.

关键词： abiotic/environmental stress ion channels adaptation - evolutionary comparative genomics gene expres-sion Brassica.

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The role of calcium sensor-interacting protein kinases in plant adaptation to potassium-deficiency: new answers to old questions

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Cell Research 2007年第6期17卷 483-485页

作者： anna amtmann Patrick Armengaud Plant Sciences Group.Institute of Biomedical and Life Sciences University of GlasgowGlasgow G12 8QQUK.

Potassium （K-） is an essential macronutrient for all livingorganisms and large amounts are required for plant growthand development. In many regions of Asia K+-fertilizationhas been neglected and soils have become K+-depleted. K+-deficiency in the field diminishes not only crop productionbut also leads to environmental problems due to inefficientusage and leaching of nitrate. Consequences of K+-defi-ciency on crop production range from decreased biomass,nutritional quality and taste of the crops to inferior harvestand storage properties, as well as increased susceptibilityto disease. Effects of K+-deficiency on plant physiology in-clude decreased photosynthetic rate, impaired tissue alloca-tion of sugars and amino acids, decreased protein synthesis,and lack of control over turgor and gas exchange [1], K+-uptake and its re-distribution within the plant is facilitatedby a plethora of membrane transport proteins displayingan astonishing diversity with respect to their affinity andselectivity for K+, mode and direction of transport, tissuespecific expression, membrane localization and regulation[2]. Microarray experiments have shown that in contrastto transporters of other macronutrients - genes encodingK--transporters display surprisingly little responsiveness tothe external nutrient supply [3]. This observation probably

关键词： CIPK The role of calcium sensor-interacting protein kinases in plant adaptation to potassium-deficiency new answers to old questions

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Coronatine-lnsensitive 1 （COI1） Mediates Transcriptional Responses of Arabidopsis thaliana to External Potassium Supply

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Molecular Plant 2010年第2期3卷 390-405页

作者： Patrick Armengaud Rainer Breitling anna amtmann Faculty of Biomedical and Life Sciences University of Glasgow Glasgow G12 8QQ UK Present address: Institut National de la Recherche Agronomique Unite de nutrition azotee des plantes RD10 78026 Versailles Cedex France Groningen Bioinformatics Centre University of Groningen Kerklaan 30 9751 NN Haren The Netherlands

The ability to adjust growth and development to the availability of mineral nutrients in the soil is an essential life skill of plants but the underlying signaling pathways are poorly understood. In Arab/dops/s thal/ana, shortage of po- tassium （K） induces a number of genes related to the phytohormone jasmonic acid （JA）. Using comparative microarray analysis of wild-type and coi1-16 mutant plants, we classified transcriptional responses to K with respect to their depen- dence on COI1, a central component of oxylipin signaling. Expression profiles obtained in a short-term experiment clearly distinguished between COil-dependent and COil-independent K-responsive genes, and identified both known and novel targets of JA-COIl-signaling. During long-term K-deficiency, coi-16 mutants displayed de novo responses covering similar functions as COil-targets except for defense. A putative role of JA for enhancing the defense potential of K-deficient plants was further supported by the observation that plants grown on low K were less damaged by thrips than plants grown with sufficient K.

关键词： Hormonal regulation nutrition secondary metabolism/natural products transcriptome analysis plantinsect interactions Arabidopsis.

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