The Spatially Variable Inhibition by Water Deficit of Maize Root Growth Correlates with Altered Profiles of Proton Flux and Cell Wall pH

Fan, Liancheng; Neumann, Peter M.

doi:10.1104/pp.104.041426

Cited by 75 publications

(64 citation statements)

References 53 publications

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“…However, the turgor pressure along the elongation zone was equally reduced in both well-watered and water deficit-stressed conditions, suggesting that cell wall extensibility is the major factor in the regulation of root cell growth (Spollen and Sharp, 1991;Zhu et al, 2007). In water-stressed roots, a reduced pH was detected in the apical region (Wu et al, 1996;Fan and Neumann, 2004;Fan et al, 2006;Zhu et al, 2007). The acidic pH could be responsible for the acid-induced extensibility that maintains the cell growth rate.…”

Section: Reprps Are Involved In the Regulation Of Cell Expansionmentioning

confidence: 95%

Abscisic Acid- and Stress-Induced Highly Proline-Rich Glycoproteins Regulate Root Growth in Rice

Tseng

Hong

et al. 2013

Plant Physiol.

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In the root of rice (Oryza sativa), abscisic acid (ABA) treatment, salinity, or water deficit stress induces the expression of a family of four genes, REPETITIVE PROLINE-RICH PROTEIN (RePRP). These genes encode two subclasses of novel proline-rich glycoproteins with highly repetitive PX 1 PX 2 motifs, RePRP1 and RePRP2. RePRP orthologs exist only in monocotyledonous plants, and their functions are virtually unknown. Rice RePRPs are heavily glycosylated with arabinose and glucose on multiple hydroxyproline residues. They are significantly different from arabinogalactan proteins that have glycan chains composed of arabinose and galactose. Transient and stable expressions of RePRP-green fluorescent protein reveal that a fraction of this protein is localized to the plasma membrane. In rice roots, ABA treatment increases RePRP expression preferentially in the elongation zone. Overexpression of RePRP in transgenic rice reduces root cell elongation in the absence of ABA, similar to the effect of ABA on wild-type roots. Conversely, simultaneous knockdown of the expression of RePRP1 and RePRP2 reduces the root sensitivity to ABA, indicating that RePRP proteins play an essential role in ABA/stress regulation of root growth and development. Moreover, rice RePRPs specifically interact with a polysaccharide, arabinogalactan, in a dosage-dependent manner. It is suggested that RePRP1 and RePRP2 are functionally redundant suppressors of root cell expansion and probably act through interactions with cell wall components near the plasma membrane.

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Section: Reprps Are Involved In the Regulation Of Cell Expansionmentioning

confidence: 95%

Abscisic Acid- and Stress-Induced Highly Proline-Rich Glycoproteins Regulate Root Growth in Rice

Tseng

Hong

et al. 2013

Plant Physiol.

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“…In addition, Tabuchi and Matsumoto (2001) suggested that the Aldecreased mechanical extensibility of the CW in wheat roots could be attributed to an increase in ferulic and diferulic acids, which crosslink CW structural components and thus strengthen the CW (Brett and Waldron 1996). The water deficit-enhanced production of phenols in the root tips was made responsible for the progressive growth cessation towards the basal region in the elongation-zone of maize (Fan and Neumann 2004) and soybean roots .…”

Section: Cell-wall Extensionmentioning

confidence: 99%

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

2013

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Background Aluminium (Al) toxicity and drought stress are two major constraints for crop production in the world, particularly in the tropics. The variation in rainfall distribution and longer dry spells in much of the tropics during the main growing period of crops are becoming increasingly important yield-limiting factors with the global climate change. As a result, crop genotypes that are tolerant of both drought and Al toxicity need to be developed. Scope The present review mainly focuses on the interaction of Al and drought on root development, crop growth and yield on acid soils. It summarizes evidence from our own studies and other published/related work, and provides novel insights into the breeding for the adaptation to these combined abiotic stresses. The primary symptom of Al phytotoxicity is the inhibition of root growth. The impeded root system will restrict the roots for exploring the acid subsoil to absorb water and nutrients which is particularly important under condition of low soil moisture in the surface soil under drought. Whereas drought primarily affects shoot growth, effects of phytotoxic Al on shoot growth are mostly secondary effects that are induced by Al affecting root growth and function, while under drought stress root growth may even be promoted. Much progress has recently been made in the understanding of the physiology and molecular biology of the interaction between Al toxicity and drought stress in common bean (Phaseolus vulgaris L.) in hydroponics and in an Al-toxic soil. Conclusions Crops growing on acid soils yield less than their potential because of the poorly developed root system that limits nutrient and water uptake. Breeding for drought resistance must be combined with Al resistance, to assure that drought resistance is expressed adequately in crops grown on soils with acid Al-toxic subsoils.

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“…Este resultado de acordo com Fan & Neumann (2004) pode estar relacionado ao fato do PEG ser quimicamente inerte, atóxico para as sementes, simulando a seca e não penetrando no tegumento devido ao tamanho de suas moléculas.…”

Section: Resultsunclassified

Estresse osmótico na germinação de sementes de Petiveria alliacea L.

Lavezo

Braga

Batistão

et al. 2015

Rev. bras. plantas med.

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RESUMO:O trabalho teve como objetivo verificar os efeitos dos estresses hídrico e salino na germinação de sementes de Petiveria alliacea, bem como definir os limites máximos de tolerância da espécie a esses estresses. As sementes foram submetidas aos agentes osmóticos NaCl, CaCl 2 e PEG nos potenciais à 0; -0,1; -0,2; -0,3; -0,4; -0,5; -0,6; -0,7; -0,8; -0,9 e -1,0 MPa sob temperatura constante de 25°C e fotoperíodo de 12 horas, com avaliações diárias durante 30 dias. As variáveis analisadas foram porcentagem de germinação, índice de velocidade de germinação, tempo médio de germinação, índice de sincronização e frequência relativa da germinação. As sementes de P. alliacea sob estresse osmótico apresentam menor porcentagem e velocidade de germinação com a redução dos potencias osmóticos, principalmente com CaCl 2 . Em potenciais osmóticos mais negativos que -0,4; -0,5 e -0,7 MPa, respectivamente nos agentes CaCl 2 , NaCl, e PEG, não ocorre germinação. O padrão de distribuição da frequência relativa aumentou a polimodalidade, o tempo médio de germinação e o índice de sincronização da germinação com a redução dos potencias osmóticos.Palavras-chave: estresse hídrico, estresse salino, planta medicinal, guiné. ABSTRACT: Osmotic stress on seed germination of Petiveria alliacea L.The study aimed to investigate the effects of water and salt stress on seed germination of Petiveria alliacea, as well as to define the limits of tolerance of the species to these stresses. The seeds were subjected to osmotic agents NaCl, CaCl 2 and PEG in the potential 0; -0.1; -0.2; -0.3; -0.4; -0.5; -0.6; -0.7; -0.8; -0.9 and -1.0 MPa at a constant temperature of 25°C and a photoperiod of 12 hours, with daily assessments for 30 days. The variables studied were germination percentage, germination velocity index, middle fear germination, synchronization index and relative frequency of germination. The seeds of P. alliacea under osmotic stress had lower percentage and speed of germination with the reduction of the the osmotic potential, especially with CaCl 2 . At more negative osmotic potentials than -0.4; -0.5 and -0.7 MPa, respectively in the CaCl 2 , NaCl, and PEG agents, the germination does not occur. The distribution pattern of the relative frequency increased the several modalities, , the average time of germination and the germination index of synchronization with the reduction of osmotic potential.

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The Spatially Variable Inhibition by Water Deficit of Maize Root Growth Correlates with Altered Profiles of Proton Flux and Cell Wall pH

Cited by 75 publications

References 53 publications

Abscisic Acid- and Stress-Induced Highly Proline-Rich Glycoproteins Regulate Root Growth in Rice

Abscisic Acid- and Stress-Induced Highly Proline-Rich Glycoproteins Regulate Root Growth in Rice

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

Estresse osmótico na germinação de sementes de Petiveria alliacea L.

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