Regulation of chlorophyll biosynthesis and degradation by salt stress in sunflower leaves

Santos, Conceição

doi:10.1016/j.scienta.2004.04.009

Cited by 456 publications

(230 citation statements)

References 11 publications

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“…Santos [43] reported that saline stress decreased chlorophyll content even at low concentrations. Although our data from UNICT do not support that finding (ESM 4), the high levels of A sat and TDW in the salinity treatment (UNICT S4 similar to UNICT S0 at Tf) (Figs.…”

Section: Salinity Effect On Plantsmentioning

confidence: 99%

Salinity and Water Stress Effects on Biomass Production in Different Arundo donax L. Clones

et al. 2015

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Perennial rhizomatous grasses are regarded as leading energy crops due to their environmental benefits and their suitability to regions with adverse conditions. In this paper, two different experiments were carried out in order to study the salinity (S) and water stress (WS) effects on biomass production in giant reed (Arundo donax L.). In Experiment 1, eight clones of giant reed were subjected to four S and WS treatments: (i) well-watered with nonsaline solution, (ii) water stress with non-saline solution, (iii) well-watered with saline solution and iv) water stress with saline solution. In Experiment 2, five clones of giant reed were subjected to increasing S levels in two locations: University of Catania (UNICT-Italy) (i)well-watered with non-saline solution and (ii)wellwatered with mild saline solution; and University of Barcelona (UB-Spain) (iii)well-watered with non-saline solution and (iv)well-watered with severe saline solution. Photosynthetic and physiological parameters as well as biomass production were measured in these plants. According to our data, giant reed seems to be more tolerant to S than WS. Both stresses mainly affected stomatal closure to prevent dehydration of the plant, and eventually decreasing the photosynthetic rate. The differential performance of the giant reed clones was ranked according to their tolerance to S and WS by using the Stress Susceptibility Index. 'Agrigento' was the most WS resistant clone and 'Martinensis' was the most S resistant. 'Martinensis' and 'Piccoplant' were found to be the most suitable clones for growing under both stress conditions. Moreover, 'Fondachello', 'Cefalú' and 'Licata' were the most resistant clones to increasing S levels.Keywords: Arundo donax L.; biomass; water stress; salinity stress; photosynthesis; Stress Susceptibility Index. ABBREVIATIONSA sat , light saturated net CO 2 assimilation rate (µmol m -2 s -1 ); DLP, complete dry leaves percentage (%); DM, dry matter (g); FC, field capacity; g s , stomatal conductance (mol m -2 s -1 ); gLA, green leaf area (m 2 ); GLP, complete green leaves percentage (%); H, height (cm); LAR, leaf area ratio (m 2 Kg -1 ); LWR, leaf weight ratio (Kg Kg -1 ); NL, number of leaves; NS, number of stems; PPFD, photosynthetic photon flux density; PRG, perennial rhizomatous grasses; RWC, relative water content (%); S, salinity; SA, stem area (m 2 ); SLA, specific leaf area (m 2 Kg -1 ); S/R, shoot/root ratio (g g -1 ); SSI, stress susceptibility index; TDW, total dry weight (g); WS, water stress; YLP, complete yellow leaves percentage (%).3

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Section: Salinity Effect On Plantsmentioning

confidence: 99%

Salinity and Water Stress Effects on Biomass Production in Different Arundo donax L. Clones

et al. 2015

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“…The decrease in chlorophyll contents in saltstressed plants can be attributed to the inhibition of nutrients uptake or insufficiency of the essential nutrients (SRINIENG et al, 2015). Moreover, many scientists also suggested that the decrease in chlorophyll levels may possibly be the results of some kind of inhibition of chlorophyll synthesis, together with the increased activity of chlorophyll degrading enzyme chlorophyllase (SANTOS, 2004). Reactive oxygen species (ROS) that form in salinity conditions also cause the chlorophyll degradation and the loss of that pigment is considered one of oxidative damage indicators (YASAR et al, 2008).…”

Section: Photosynthetic Pigmentsmentioning

confidence: 99%

Salt stress and exogenous silicon influence physiological and anatomical features of in vitro-grown cape gooseberry

et al. 2017

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Salt stress is one of several major abiotic stresses that affect plant growth and development, and there are many evidences that silicon can ameliorate the injuries caused by high salinity. This study presents the results of an assay concerning: (1) the effect of in vitro NaCl-induced salt stress in cape gooseberry plants and (2) the possible mitigating effect of silicon in saline conditions. For that, nodal segments were inoculated in Murashige and Skoog (MS) medium under salinity (0.5 and 1.0% NaCl) with different silicic acid concentrations (0, 0.5 and 1.0g L-1). Phytotechnical characteristics, photosynthetic pigments content, and leaf anatomy were evaluated after 30 days. Shoot length, root length, number of leaves and buds, fresh and dry weight, pigment content, stomatal density and leaf blade thickness were drastically reduced by increased salt level. The supply of silicon (1.0g L-1) has successfully mitigated the effect of salinity at 0.5% NaCl for chlorophyll, carotenoids, stomatal density and leaf blade thickness. When salt stress was about 1.0%, Si was not effective anymore. In conclusion, we affirmed that, in in vitro conditions, salt stress is harmful for cape gooseberry plants and the addition of silicon showed effective in mitigating the saline effects of some features.

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“…40% of the non-treated controls, was observed. The decrease in chlorophyll levels in plants affected by salt is due to the inhibition of chlorophyll synthesis, together with the activation of its degradation by the enzyme chlorophyllase (Santos, 2004). Yet, reduction of chlorophyll contents is not the only reason for the inhibition of photosynthesis in the presence of salt, since NaCl also inhibits key enzymes involved in this process, such as Rubisco and PEP carboxylase (Soussi et al, 1998).…”

Section: Malondialdehydementioning

confidence: 99%

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

Hassan

Fuertes

Sánchez

et al. 2015

Not Bot Hort Agrobot Cluj

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The effects of salt and water stress on growth and several stress markers were investigated in cherry tomato plants. Some growth parameters (stem length and number of leaves) and chlorophyll contents were determined every third day during plant growth, and leaf material was collected after 25 and 33 days of treatment. Both stresses inhibited plant growth; chlorophyll levels, however, decreased only in response to high NaCl concentrations. Proline contents largely increased in leaves of stressed plants, reaching levels high enough to play a major role in cellular osmotic adjustment. Despite reports indicating that tomato does not synthesize glycine betaine, the stress-induced accumulation of this osmolyte was detected in cherry tomato, albeit at lower concentration than that of proline. Therefore, it appears that the plants are able to synthesise glycine betaine as a secondary osmolyte under strong stress conditions. Total sugars levels, on the contrary, decreased in stress-treated plants. Both stress treatments caused secondary oxidative stress in the plants, as indicated by a significant increase in malondialdehyde (MDA) contents. Water stress led to an increase in total phenolics and flavonoid contents and a reduction of carotenoid levels in the leaves; flavonoids also increased under high salinity conditions.

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Regulation of chlorophyll biosynthesis and degradation by salt stress in sunflower leaves

Cited by 456 publications

References 11 publications

Salinity and Water Stress Effects on Biomass Production in Different Arundo donax L. Clones

Salinity and Water Stress Effects on Biomass Production in Different Arundo donax L. Clones

Salt stress and exogenous silicon influence physiological and anatomical features of in vitro-grown cape gooseberry

Effects of Salt and Water Stress on Plant Growth and on Accumulation of Osmolytes and Antioxidant Compounds in Cherry Tomato

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