Effects of water and salt stresses on growth, water relations and gas exchange in<i>Rosmarinus officinalis</i>

Alarcón, Juan José; Jiménez, M.N.; Ferrández, Trinitario; Sánchez-Blanco, María Jesús

doi:10.1080/14620316.2006.11512148

Cited by 36 publications

(29 citation statements)

References 29 publications

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“…The absence and presence of increased ratios in both species could also be indicative of the higher relative tolerance to saline stress of C. citrinus compared to C. laevis. The different distribution of biomass induced by both stress situations may be due to the need to maintain a higher root surface area under drought conditions and the need to reduce root volume in plants exposed to salinity, which may be a favourable trait limiting their capacity to accumulate toxic ions in the shoot (Munns, 2002;Alarcón et al, 2006;Munns and Tester, 2008). Slama et al (2008) also reported that the preferential biomass allocation to roots of plants submitted to deficit irrigation alone is lowered when salt is present in the irrigation water used, which indicates than this ratio does not only depends on the amount of water applied, but also depends on the EC of the water.…”

Section: Discussionmentioning

confidence: 99%

Comparison of individual and combined effects of salinity and deficit irrigation on physiological, nutritional and ornamental aspects of tolerance in Callistemon laevis plants

Álvarez

Sánchez-Blanco

2015

Journal of Plant Physiology

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SummaryThe effect of water deficit, salinity and both applied simultaneously on several physiological and morphological parameters in the ornamental plant Callistemon laevis was studied to identify the tolerance mechanisms developed by this species to these sources of stress and to evaluate their adaptability to such conditions. C. laevis plants were grown in pots outdoors and subjected to four irrigation treatments lasting ten months: control (0.8 dS m -1 , 100% water holding capacity), water deficit (0.8 dS m -1 , 50% of the amount of water supplied in control), saline (4.0 dS m -1 , same amount of water supplied as control) and saline water deficit (4.0 dS m -1 , 50% of the water supplied in the control). Water and saline stress when applied individually led to a reduction of 12 and 39% of total biomass, respectively, while overall plant quality (leaf color and flowering) was unaffected. However, saline water deficit affected leaf color and flowering and induced an excessive decrease of growth (68%) due to leaf tissue dehydration and a high leaf Cl and Na concentration. Biomass partitioning depended no only on the amount of water applied, but also on the electrical conductivity of the water. Water stress induced active osmotic adjustment and decreased leaf tissue elasticity. Although both Na and Cl concentrations in the plant tissues increased with salinity, Cl entry through the roots was more restricted. In plants submitted to salinity individually, Na tended to remain in the roots and stems, and little reached the leaves. However, plants simultaneously submitted to water and saline stress were not able to retain this ion in the woody parts. The decrease in stomatal conductance and photosynthesis was more marked in the plants submitted to both stresses, the effect of which decreased photosynthesis, and this together with membrane damage, could delay plant recovery. The results show that the combination of deficit irrigation and salinity in C. laevis is not recommended since it magnifies the adverse effects of either when applied individually.Keywords: Gas exchange; Ion uptake; Ornamental potted plant; Water relations; Water use efficiency; Elastic modulus.Abbreviations: C, control; C*, chroma; DW, dry weight; EC, electrical conductivity; gs, stomatal conductance; hº, hue angle; J, absorption rate of ions by the root system; L*, lightness; P, significance; Pn, net photosynthesis rate; P-V, pressure-volume; RWCtpl, relative water content at turgor loss point ; S, saline treatment; W, deficit irriation treatment; WUE, water use efficiency of production; W+S, simultaneous saline and water stress treatment.; Ψl, leaf water potential; Ψs, stem water potential; Ψ100s, leaf osmotic potential at full turgor; Ψtpl, leaf water potential at turgor loss point. ε; bulk modulus of elasticity.3

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Section: Discussionmentioning

confidence: 99%

Comparison of individual and combined effects of salinity and deficit irrigation on physiological, nutritional and ornamental aspects of tolerance in Callistemon laevis plants

Álvarez

Sánchez-Blanco

2015

Journal of Plant Physiology

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“…Accordingly, an increase in resistance to water flow from soil to plant under salinity has been observed in many species [85,89]. For example, root hydraulic resistance has been found to increase in salt-stressed plants such as Euonymus japonica, Phlomis purpurea, and Rosmarinus officinalis, in which the lowest leaf water potential values have been recorded [45,83,89].…”

Section: Effects Of Salinity On Leaf Water Relations and Gas Exchangementioning

confidence: 99%

“…These mechanisms are based on stomatal closure and a reduced leaf area, in order to minimise water loss via transpiration [83]. Other resistance mechanisms include the development of osmotic adjustments, mainly involving the intake of inorganic solutes from the soil under salt stress situations to facilitate the maintenance of leaf turgor [69,123,148].…”

Section: Effects Of Salinity On Leaf Water Relations and Gas Exchangementioning

confidence: 99%

Plant Responses to Salt Stress: Adaptive Mechanisms

et al. 2017

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This review deals with the adaptive mechanisms that plants can implement to cope with the challenge of salt stress. Plants tolerant to NaCl implement a series of adaptations to acclimate to salinity, including morphological, physiological and biochemical changes. These changes include increases in the root/canopy ratio and in the chlorophyll content in addition to changes in the leaf anatomy that ultimately lead to preventing leaf ion toxicity, thus maintaining the water status in order to limit water loss and protect the photosynthesis process. Furthermore, we deal with the effect of salt stress on photosynthesis and chlorophyll fluorescence and some of the mechanisms thought to protect the photosynthetic machinery, including the xanthophyll cycle, photorespiration pathway, and water-water cycle. Finally, we also provide an updated discussion on salt-induced oxidative stress at the subcellular level and its effect on the antioxidant machinery in both salt-tolerant and salt-sensitive plants. The aim is to extend our understanding of how salinity may affect the physiological characteristics of plants.

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“…Accordingly, an increase in resistance to water flow from soil to plant under salinity has been observed in many species [98,116]. For example, root hydraulic resistance has been found to increase in salt-stressed plants such as Euonymus japonica, Phlomis purpurea, and Rosmarinus officinalis, in which the lowest leaf water potential values have been recorded [45,116,134].…”

Section: Effects Of Salinity On Leaf Water Relations and Gas Exchangementioning

confidence: 99%

“…These mechanisms are based on stomatal closure and a reduced leaf area, in order to minimise water loss via transpiration [134]. Other resistance mechanisms include the development of osmotic adjustments, mainly involving the intake of inorganic solutes from the soil under salt stress situations to facilitate the maintenance of leaf turgor [69,120,147].…”

Section: Effects Of Salinity On Leaf Water Relations and Gas Exchangementioning

confidence: 99%

Plant Responses to Salt Stress: Adaptive Mechanisms

Acosta‐Motos¹,

Ortuño²,

Bernal‐Vicente³

et al. 2017

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Effects of water and salt stresses on growth, water relations and gas exchange inRosmarinus officinalis

Cited by 36 publications

References 29 publications

Comparison of individual and combined effects of salinity and deficit irrigation on physiological, nutritional and ornamental aspects of tolerance in Callistemon laevis plants

Comparison of individual and combined effects of salinity and deficit irrigation on physiological, nutritional and ornamental aspects of tolerance in Callistemon laevis plants

Plant Responses to Salt Stress: Adaptive Mechanisms

Plant Responses to Salt Stress: Adaptive Mechanisms

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