Exposure to water stress causes changes in the biosynthesis of cell wall polysaccharides in roots of wheat cultivars varying in drought tolerance

Piro, Gabriella; Leucci, Maria Rosaria; Waldron, Keith W.; Dalessandro, Giuseppe

doi:10.1016/s0168-9452(03)00215-2

Cited by 67 publications

(52 citation statements)

References 47 publications

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“…To create such drought condition, a hydroponic system using polyethylene glycol (PEG) has been considered. PEG is a nonpenetrating osmotic agent that lowers water potential causing a water stress condition (Piro et al, 2003) and previous studies using this system to induce a stress condition have shown its efficacy (Villela et al, 1991;Furlani, 1997;Piro et al, 2003;Wu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

In silico analysis of ESTs from roots of Rangpur lime (Citrus limonia Osbeck) under water stress

et al. 2007

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CitEST project resulted in the construction of cDNA libraries from different Citrus sp. tissues under various physiological conditions. Among them, plantlets of Rangpur lime were exposed to hydroponic conditions with and without water stress using PEG6000. RNA from roots was obtained and generated a total of 4,130 valid cDNA reads, with 2,020 from the non-stressed condition and 2,110 from the stressed set. Bioinformatic analyses measured the frequency of each read in the libraries and yielded an in silico transcriptional profile for each condition. A total of 40 contigs were differentially expressed and allowed to detect up-regulated homologue sequences to well known genes involved in stress response, such as aquaporins, dehydrin, sucrose synthase, and proline-related synthase. Some sequences could not be classified by using FunCat and remained with an unknown function. A large number of sequences presented high similarities to annotated genes involved with cell energy, protein synthesis and cellular transport, suggesting that Rangpur lime may sustain active cell growth under stressed condition. The presence of membrane transporters and cell signaling components could be an indication of a coordinated morphological adaptation and biochemical response during drought, helping to explain the higher tolerance of this rootstock to water stress.

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Section: Introductionmentioning

confidence: 99%

In silico analysis of ESTs from roots of Rangpur lime (Citrus limonia Osbeck) under water stress

et al. 2007

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“…No entanto, a maioria deles utiliza como modelo espécies de interesse agronômico, tais como milho (Sharp & Lenoble 2002, Sharp et al 2004, Fan & Neumann 2004, trigo (Asseng et al 1998, Morillon & Lassalles 2002, Piro et al 2003, grão-de-bico (Basu et al 2007), mandioca (Santisopasri et al 2001) e batata (Geigenberger et al 1997). Especifi camente no caso da batata (Solanum tuberosum L.), que acumula amido como principal carboidrato de reserva em seus órgãos subterrâneos (tubérculos) e também uma das mais estudadas sob condições de estresse hídrico, os trabalhos realizados demonstram que a disponibilidade hídrica regula as taxas de síntese de amido e crescimento dos tubérculos (Oparka & Wright 1988a, b) e que tanto a síntese como a degradação desse carboidrato são alteradas sob condições de déficit hídrico, com respostas, em geral, associadas ao aumento nos níveis de açúcares solúveis e inibição da síntese de amido (Geigenberger et al 1997).…”

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Aspectos fisiológicos, anatômicos e ultra-estruturais do rizoma de Costus arabicus L. (Costaceae) sob condições de déficit hídrico

Costa

Hayashi

Carvalho

et al. 2012

Hoehnea

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-(Physiological, anatomical and ultrastructural aspects of the rhizome of Costus arabicus L. (Costaceae) under water defi cit conditions). Costus arabicus L. is an herbaceous species, native to the forest that accumulates starch in the rhizome as the main reserve carbohydrate. Water stress is one the most important environmental factor that regulates plant growth and development, leading to changes in physiological, biochemical and anatomical traits. The aim of this study was to evaluate the effect of water defi cit on the anatomy, carbohydrate concentration and ultrastructure of starch grains of the rhizome of Costus arabicus L. through the following water regimes: plants irrigated daily and every seven (7d) and 15 days (15d). Anatomical and ultrastructural traits of the rhizome, relative water content in leaves (RWC), leaf water potential (Ψw), osmotic potential of the rhizome (Ψo), total soluble sugars (TSS), reducing sugars (RS) and starch of the rhizome were evaluated. We observed signifi cant reductions in Ψw and Ψs in 15d plants, but with small variations in the RWC. The anatomical analysis showed that the rhizome is covered by epidermis or stratifi ed cork and there is a delimitation between the cortical and vascular regions. We detected the presence of numerous starch grains and idioblasts with phenolic contents in the parenchyma of the two regions. Changes in the anatomy of the rhizomes were only observed in plants irrigated every 15 days, in which cells of covering tissue and the outer cortical layers became more fl attened and sinuous walls; however, no ultrastructural differences were observed on the starch grains. The water defi cit imposed was suffi cient to generate physiological, biochemical and anatomical changes in plants of C. arabicus L. Such alterations suggest the occurence of an avoidance mechanism and that anatomical changes were dependent of the intensity and duration of water defi cit. Key words: drought, starch, water stress RESUMO -(Aspectos fi siológicos, anatômicos e ultra-estruturais do rizoma de Costus arabicus L. (Costaceae) sob condições de défi cit hídrico). Costus arabicus L. é uma espécie herbácea, nativa de mata, que acumula em seu rizoma amido como principal carboidrato de reserva. A seca é um dos fatores ambientais que pode regular o crescimento e o desenvolvimento das plantas, levando a alterações nas características fi siológicas, bioquímicas e anatômicas. Este trabalho objetivou avaliar a infl uência do défi cit hídrico na anatomia, no conteúdo de carboidratos e na ultra-estrutura dos grãos de amido do rizoma de Costus arabicus L. submetidos aos ciclos de rega diário (Controle) e a cada sete (7d) e 15 dias (15d). Foram avaliados aspectos anatômicos e ultra-estruturais do rizoma, conteúdo relativo de água nas folhas (CRA), potencial hídrico foliar (Ψw), potencial osmótico do rizoma (Ψs), açúcares solúveis totais (AST) e redutores (AR) e amido do rizoma. Observaram-se reduções signifi cativas do Ψw e do Ψs nas plantas 15d, porém com pequenas variações no CRA. An...

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“…Isso é particularmente importante, pois a síntese, transporte e incorporação de novos polissacarídeos sintetizados na parede celular certamente modificam as propriedades desta e conseqüentemente a sua susceptibilidade a ação dos agentes degradantes (PIRO et al, 2003).…”

Section: Muitos Estudos Evidenciaram O Acúmulo Da Prolina Em Diversasunclassified

“…Todos esses carboidratos influenciam nas propriedades de movimentação da matriz da parede celular, a qual é importante para a proteção das células contra a dissecação (PIRO et al, 2003). Assim, essa síntese de compostos fibrosos da parede celular (pois os açúcares determinados compõem a hemicelulose) pode induzir no apoplasto a formação de um gel polimérico capaz de fixar íons, e reter quantidades consistentes de água.…”

Section: Ajuste Osmóticounclassified

“…Portanto, com as informações relatadas, é tentador especular que um dos caminhos para aumentar a tolerância das plantas ao estresse hídrico pode ser encontrado através de uma superexpressão de genes relacionados à síntese de polissacarídeos da matriz e em particular àqueles polímeros que conferem a capacidade de manter a água na parede celular (PIRO et al, 2003).…”

Section: Ajuste Osmóticounclassified

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Indução e seleção de linhagens celulares de Eucalyptus urophylla para tolerância aos estresses hídrico e térmico

Viana¹

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Exposure to water stress causes changes in the biosynthesis of cell wall polysaccharides in roots of wheat cultivars varying in drought tolerance

Cited by 67 publications

References 47 publications

In silico analysis of ESTs from roots of Rangpur lime (Citrus limonia Osbeck) under water stress

In silico analysis of ESTs from roots of Rangpur lime (Citrus limonia Osbeck) under water stress

Aspectos fisiológicos, anatômicos e ultra-estruturais do rizoma de Costus arabicus L. (Costaceae) sob condições de déficit hídrico

Indução e seleção de linhagens celulares de Eucalyptus urophylla para tolerância aos estresses hídrico e térmico

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