Effect of salinity and PEG-induced water stress on water status, gas exchange, solute accumulation, and leaf growth in Ipomoea pes-caprae

Sucre, B.; Suárez, N.

doi:10.1016/j.envexpbot.2010.09.004

Cited by 75 publications

(59 citation statements)

References 40 publications

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“…Hence, the inferences described above can explain plant survivability based upon an association between ETpc-and CE-stressing agents, assuming that the regulation of stomatal opening, and consequently control of water loss, is a mechanism adopted by plants to adjust to adverse conditions (CHAVES; FLEXAS; PINHEIRO, 2009). These assertions are corroborated by Sucre and Suárez (2011), who hypothesized that plants respond to drought and salinity by closing stomata, thus reducing leaf transpiration and/or preventing the development of an excessive water deficit situation in tissues. This response enables the leaf to retain a water potential capable of maintaining its adjustment to and/or recovery from stressor-induced damage, whether these stressors act in isolation or in combination.…”

Section: As the Water Supply Becomes Limiting Transpiration Decreasesupporting

confidence: 63%

“…Conversely, the lowest photosynthetic rates were measured when a drought level corresponding to 20% of ETpc in association with the highest level of soil salinity (40.70 dS m -1 ) were imposed; the extent of reduction was extremely dependent on the intensity of drought and salt levels (Figure 3). This behavior contrasts with the observations reported by Sucre and Suárez (2011), wherein some studies showed that plant survivability capacity increases when affected by a combination of salinity and drought, i.e., compared to situations in which the plants are only affected by drought or salinity alone, plant physiology is less compromised. Thus, the general trends shown in the present study support the hypothesis that stressor combinations may potentiate the effects of their action when acting alone (CHAVES; FLEXAS; PINHEIRO, 2009).…”

Section: As the Water Supply Becomes Limiting Transpiration Decreasecontrasting

confidence: 54%

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Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

et al. 2017

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-The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‗Jiqui Green' associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m -1 ). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met.Keywords: Cocos nucifera L.. Water and salt stress. Physiology. RESPOSTAS FISIOLÓGICAS DE PLANTAS DE COQUEIRO ANÃO SOB DEFICIÊNCIA HÍDRICA, EM SOLOS AFETADOS POR SAISResumo -Objetivou-se, com este trabalho, caracterizar as repostas fisiológicas aclimatativas de plantas jovens de coqueiro Anão, cultivar -Verde do Jiqui‖, associadas com a sua tolerância às condições de múltiplos estresses abióticos (deficiência hídrica e salinidade do solo), atuando isolados e/ou combinados. O estudo foi realizado sob condições controladas e avaliaram-se: as trocas gasosas foliares, o rendimento quântico da fluorescência da clorofila a e os teores relativos de clorofila total (índice Spad). O experimento foi conduzido sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, sendo as parcelas constituídas por diferentes níveis de deficiência hídrica, mediante a imposição de cinco distintos percentuais de reposição das perdas de água por evapotranspiração potencial da cultura (100; 80; 60; 40 e 20%) e as subparcelas constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m -1 ). Os mecanismos fisiológicos são efetivamente limitados quando a deficiência hídrica e a salinidade atuam isoladamente e/ou em conjunto. Os efeitos do estresse hídrico se mostram mais efetivos nos comprometimentos dos parâmetros fisiológicos, em detrimento à salinidade do solo. As magnitudes da...

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Section: As the Water Supply Becomes Limiting Transpiration Decreasesupporting

confidence: 63%

Section: As the Water Supply Becomes Limiting Transpiration Decreasecontrasting

confidence: 54%

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

et al. 2017

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“…The higher osmotic adjustment achieved by plants of N. glauca under salinity could assist for a better tolerance towards water deficit during the dry season in the field. When the combined effect of water deficit and salinity was experimentally examined in plants of Ipomoea pescaprae, using polyethylene glycol in order to reduce substrate Ψ s (Sucre and Suárez, 2011), plants resulted more susceptible to water deficit than to soil salinity, while the water and carbon balances were even enhanced when both stresses were applied simultaneously.…”

Section: Discussionmentioning

confidence: 99%

Ecophysiological responses to drought and salinity in the cosmopolitan invader Nicotiana glauca

González

Tezara

Rengifo

et al. 2012

Braz. J. Plant Physiol.

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Nicotiana glauca, a shrub native to southern South America, is widely distributed in the Americas, from Patagonia to the USA, from zero up to 3,700 m; it rapidly invades disturbed environments. In Venezuela, it has been reported from zero up to 2,000 m growing in contrasting conditions of relative humidity, temperature, rainfall, and salinity. In order to gain insight into the extent and mode of resistance to drought and salinity in N. glauca, we studied the effect of these factors on water relations and photosynthesis under both natural and greenhouse conditions. In the field, water potential, photosynthetic rate (A) and stomatal conductance (g s ), but not relative water content (RWC) decreased because of drought. Manual removal of epicuticular wax increased excess energy dissipation through non-photochemical quenching without altering the capacity of photochemical quenching. In the greenhouse, water deficit as well as salinity resulted in osmotic adjustment; at the end of the experiment, turgor potential and RWC under water deficit were similar to control and higher under salinity. Water deficit and salinity caused marked decreases in A and g s . There were very few or no changes with natural drought, salinity or experimental water deficit in potential quantum efficiency of PSII, which could be explained partly by an increased nonphotochemical quenching. We conclude that the partial tolerance to drought and salinity in plants of N. glauca resides in their ability to achieve water conservation through stomatal closure and osmotic adjustment, reduce absorption of excess radiation through the presence of leaf wax and dissipate it through increased non-photochemical quenching. All these characteristics confer plants of N. glauca advantages to invade disturbed areas, subject to salinity and/or seasonal drought under high irradiance.

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“…Moreover, increases in proline levels were small, and their onset was delayed after stress imposition; thus, their increase may be a consequence instead of a stress-induced beneficial response. The effect of salinity and PEG-induced water stress on water status, gas exchange, and solute accumulation in Ipomoea pes-caprae was evaluated by Sucre & Suárez (2011). They observed that under saline conditions, plants accumulated higher Na + concentrations; the accumulation increased with increasing NaCl concentration.…”

Section: Osmoregulation (The Participation Of Organic and Inorganic Smentioning

confidence: 99%

Physiological and Biochemical Responses of Semiarid Plants Subjected to Water Stress

Oliveira¹,

Alencar²,

Gomes-Filho³

2012

Water Stress

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Effect of salinity and PEG-induced water stress on water status, gas exchange, solute accumulation, and leaf growth in Ipomoea pes-caprae

Cited by 75 publications

References 40 publications

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

Physiological Responses of Dwarf Coconut Plants Under Water Deficit in Salt-Affected Soils

Ecophysiological responses to drought and salinity in the cosmopolitan invader Nicotiana glauca

Physiological and Biochemical Responses of Semiarid Plants Subjected to Water Stress

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