Root signalling and modulation of stomatal closure in flooded citrus seedlings

Rodríguez‐Gamir, Juan; Ancillo, Gema; González‐Mas, M. Carmen; Primo‐Millo, Eduardo; Iglesias, Domingo J.; Forner-Giner, María Ángeles

doi:10.1016/j.plaphy.2011.03.003

Cited by 95 publications

(70 citation statements)

References 63 publications

(100 reference statements)

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“…Despite excessive water in the soil, some plants display symptoms of water deficit after reoxygenation, such as wilted leaves, and up-regulate dehydration-responsive genes (Setter et al, 2010;Fukao et al, 2011;Tamang et al, 2014;Tsai et al, 2014). These symptoms could be caused by reduced hydraulic conductance of flooded roots (Rodríguez-Gamir et al, 2011). Flooding tolerance, therefore, involves surviving not just submergence but also, thereafter, limiting dehydration and oxidative stress and recovering growth and photosynthesis.…”

Section: After the Floods: Ethylene And Postsubmergence Acclimationmentioning

confidence: 99%

Ethylene-Mediated Acclimations to Flooding Stress

2015

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Flooding is detrimental for plants, primarily because of restricted gas exchange underwater, which leads to an energy and carbohydrate deficit. Impeded gas exchange also causes rapid accumulation of the volatile ethylene in all flooded plant cells. Although several internal changes in the plant can signal the flooded status, it is the pervasive and rapid accumulation of ethylene that makes it an early and reliable flooding signal. Not surprisingly, it is a major regulator of several flood-adaptive plant traits. Here, we discuss these major ethylene-mediated traits, their functional relevance, and the recent progress in identifying the molecular and signaling events underlying these traits downstream of ethylene. We also speculate on the role of ethylene in postsubmergence recovery and identify several questions for future investigations.

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Section: After the Floods: Ethylene And Postsubmergence Acclimationmentioning

confidence: 99%

Ethylene-Mediated Acclimations to Flooding Stress

2015

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“…In Citrus seedlings, leaf ABA levels increased after 3 wk flooding, suggesting that stomata closed independently. Also, they found that ABA is produced in old leaves and transported to younger leaves upon flooding, rather than translocation of ABA from roots to shoots (Rodriguez-Gamir et al, 2011). Studies in peas under waterlogging conditions concluded that leaves are not enriched substantially with ABA from roots, suggesting that leaves themselves are the most probable source of this growth regulator (Jackson et al, 1988).…”

Section: Waterlogging Causes Anatomical Physiological and Molecular mentioning

confidence: 99%

Plant water stress: Associations between ethylene and abscisic acid response

Salazar

Hernández²,

Pino³

2015

Chilean J. Agric. Res.

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Agriculture is severely impacted by water stress due either to excess (hypoxia/anoxia) or deficit of water availability. Hypoxia/anoxia is associated with oxygen (O 2 ) deficiency or depletion, inducing several anatomical, morphological, physiological, and molecular changes. The majority of these alterations are adaptive mechanisms to cope with low O 2 availability; among them, alterations in shoot length, aerenchyma formation and adventitious roots have been described in several studies. The aim of this review was to address the association between abscisic acid (ABA) and ethylene in function of water availability in plants. The major physiological responses to low O 2 are associated with changes in root respiration, stomatal conductance, photosynthesis, and fermentation pathways in roots. In addition, several changes in gene expression have been associated with pathways that are not present under normal O 2 supply. The expression of ethylene receptor genes is up-regulated by low O 2 , and ethylene seems to have a crucial role in anatomical and physiological effects during hypoxia/anoxia. During O 2 depletion, ethylene accumulation down-regulates ABA by inhibiting rate-limiting enzymes in ABA biosynthesis and by activating ABA breakdown to phaseic acid. With regard to water deficit, drought is primarily sensed by the roots, inducing a signal cascade to the shoots via xylem causing physiological and morphological changes. Several genes are regulated up or down with osmotic stress; the majority of these responsive genes can be driven by either an ABA-dependent or ABA-independent pathway. Some studies suggest that ethylene shuts down leaf growth very fast after the plant senses limited water availability. Ethylene accumulation can antagonize the control of gas exchange and leaf growth upon drought and ABA accumulation.

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“…Specific probes for PIP1 and PIP2 were designed, amplified, cloned and labelled as described in Rodríguez-Gamir et al (2011).…”

Section: Cloning Of Pipsmentioning

confidence: 99%

Water-deficit tolerance in citrus is mediated by the down regulation of PIP gene expression in the roots

et al. 2011

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Water deficit (WD) is a growing problem in agriculture. In citrus crops, genetically-determined rootstock characteristics are important factors influencing plant responses to WD. Aquaporins are involved in regulating the water supply to the plant by mediating water flow through the cell membranes. Recent studies support a direct role for aquaporins in plant water relations and demonstrate their involvement in WD tolerance. This study investigates the relationship between photosynthetic and water-balance parameters with aquaporin expression levels and hydraulic conductance of roots (Kr) in conditions of moderate WD in citrus rootstocks. The plant materials used were the rootstocks Poncirus trifoliata (L.) Raf. (PT), Cleopatra mandarin (Citrus reshni Hort ex Tan.) (CM) and 030115 (a hybrid of the two former rootstocks), all grafted with the citrus variety 'Valencia Late' (C. sinensis (L.) Osb). Plants were irrigated with two differents irrigation doses (normal irrigation and moderate WD) during 70 days and leaf water potential (ψs), net CO 2 assimilation (A CO2 ), transpiration, stomatal conductance (gs) and substomatal CO 2 concentration (Ci) were measured periodically under both irrigation conditions. Kr and PIP1 and PIP2 gene expression levels in fine roots of control plants and plants subjected to WD on day 43 of the experiment were determined. Under WD conditions, the hybrid 030115 drastically reduced aquaporin expression and Kr, accompanied by a loss of plant vigour but without reducing the net CO 2 assimilation (A CO2 ). PT maintained the same aquaporin expression level and similar Kr under WD as under normal irrigation conditions, but suffered a sharp reduction in A CO2 . CM, which has lower Kr and aquaporin expression than PT under both normal irrigation conditions and WD, responded better to water stress conditions than PT. Low aquaporin levels, or down-regulated aquaporin Plant Soil (2011) 347:91-104 expression, accompanied by decreased plant vigour led to decreased plasma membrane permeability, thereby facilitating water retention in the cells under water stress conditions. This may induce water stress tolerance in citrus rootstocks.

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Root signalling and modulation of stomatal closure in flooded citrus seedlings

Cited by 95 publications

References 63 publications

Ethylene-Mediated Acclimations to Flooding Stress

Ethylene-Mediated Acclimations to Flooding Stress

Plant water stress: Associations between ethylene and abscisic acid response

Water-deficit tolerance in citrus is mediated by the down regulation of PIP gene expression in the roots

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