Relationship between the photosynthetic activity and the performance of <i>Cakile maritima</i> after long‐term salt treatment

Debez, Ahmed; Koyro, Hans‐Werner; Grignon, Claude; Abdelly, Chédly; Huchzermeyer, Bernhard

doi:10.1111/j.1399-3054.2008.01086.x

Cited by 76 publications

(35 citation statements)

References 62 publications

(86 reference statements)

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“…S treatment suggests the implication of these pigments in the antioxidant response. Indeed, anthocyanins are potent antioxidants known for their protective role against photoinhibiton in stressed plants (Debez et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Alleviation of phosphorus deficiency stress by moderate salinity in the halophyte Hordeum maritimum L.

et al. 2011

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Hordeum maritimum (Poacea) is a facultative halophyte potentially useful for forage production in saline zones. Here, we assessed whether moderate NaCl-salinity can modify the plant response to phosphorus (P) shortage. Plants were cultivated for 55 days under low or sufficient P supply (5 or 60 lmol plant -1 week -1 KH 2 PO 4 , respectively), with or without 100 mM NaCl. When individually applied, salinity and P deficiency significantly restricted whole-plant growth, with a more marked effect of the latter stress. Plants subjected to P deficiency showed a significant increase in root growth (as length and dry weight) and root/ shoot DW ratio. Enhanced root growth and elongation presumably correspond to the well-known root adaptive response to mineral deficiency. However, leaf relative water content, leaf P concentration, and leaf gas exchange parameters were significantly restricted. The interactive effects of salinity and P deficiency were not added one to another neither on whole plant biomass nor on plant nutrient uptake. Indeed, 100 mM NaCl-addition to P-deficient plants significantly restored the plant growth and improved CO 2 assimilation rate, root growth, K ? /Na ? ratio and leaf proline and soluble sugar concentrations. It also significantly enhanced leaf total antioxidant capacity and leaf anthocyanin concentration. This was associated with significantly lower leaf osmotic potential, leaf Na ? and malondialdehyde (MDA) concentration. Taken together, these results suggest that mild salinity may mitigate the adverse effects of phosphorus deficiency on H. maritimum by notably improving the plant photosynthetic activity, the osmotic adjustment capacity, the selective absorption of K ? over Na ? and antioxidant defence.

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Section: Discussionmentioning

confidence: 99%

Alleviation of phosphorus deficiency stress by moderate salinity in the halophyte Hordeum maritimum L.

et al. 2011

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“…Measurements of chlorophyll a (Chl a) fluorescence is a rapid and noninvasive tool used to screen varieties for salinity tolerance. Previous reports of NaCl effects on Chl a fluorescence suggested that F v /F m was not a useful indicator of salt stress (Santos 2004;Jiang et al 2006;Debez et al 2008;Degl'Innocenti et al 2009;Hichem et al 2009). In contrast, other authors (Misra et al 2001;Lu et al 2003a, b;Netondo et al 2004;Demiral and Türkan 2006) reported that F v /F m was an early indicator of salt stress.…”

Section: Abbreviationsmentioning

confidence: 96%

Effects of NaCl or Na2SO4 salinity on plant growth, ion content and photosynthetic activity in Ocimum basilicum L.

et al. 2011

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Basil (Ocimum basilicum L., cultivar Genovese) plants were grown in Hoagland solution with or without 50 mM NaCl or 25 mM Na 2 SO 4 . After 15 days of treatment, Na 2 SO 4 slowed growth of plants as indicated by root, stem and leaf dry weight, root length, shoot height and leaf area, and the effects were major of those induced by NaCl. Photosynthetic response was decreased more by chloride salinity than by sulphate. No effects in both treatments on leaf chlorophyll content, maximal efficiency of PSII photochemistry (F v /F m ) and electron transport rate (ETR) were recorded. Therefore, an excess of energy following the limitation to CO 2 photoassimilation and a down regulation of PSII photochemistry was monitored under NaCl, which displays mechanisms that play a role in avoiding PSII photodamage able to dissipate this excess energy. Ionic composition (Na ? , K ? , Ca 2? , and Mg 2? ) was affected to the same extent under both types of salinity, thus together with an increase in leaves Cl -, and roots SO 4 2-in NaCl and Na 2 SO 4 -treated plants, respectively, may have resulted in the observed growth retardation (for Na 2 SO 4 treatment) and photosynthesis activity inhibition (for NaCl treatment), suggesting that those effects seem to have been due to the anionic component of the salts.

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“…Actually, F v /F m values (up to 0.75) over the salinity range were close to those considered as typical to healthy nonstressed leaves (0.75-0.85) (Vassilev and Manolov, 1999). Hence, B. maritima was able to maintain the photosynthetic-apparatus integrity, even at salinity levels exceeding that of seawater, which demonstrates a very high degree of salinity tolerance relative to other halophytic species (Redondo-Gómez et al, 2006;Debez et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Responses of Batis maritima plants challenged with up to two‐fold seawater NaCl salinity

Debez

Saadaoui

Slama

et al. 2010

Z. Pflanzenernähr. Bodenk.

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Batis maritima is a promising halophyte for sand-dune stabilization and saline-soil reclamation. This species has also applications in herbal medicine and as an oilseed crop. Here, we address the plant response to salinity reaching up to two-fold seawater concentration (0-1000 mM NaCl), with a particular emphasis on growth, water status, mineral nutrition, proline content, and photosystem II integrity. Plant biomass production was maximal at 200 mM NaCl, and the plants survived even when challenged with 1000 mM NaCl. Plant water status was not impaired by the high accumulation of sodium in shoots, suggesting that Na + compartmentalization efficiently took place in vacuoles. Concentrations of Mg 2+ and K + in shoots were markedly lower in salttreated plants, while that of Ca 2+ was less affected. Soluble-sugar and chlorophyll concentrations were hardly affected by salinity, whereas proline concentration increased significantly in shoots of salt-treated plants. Maximum quantum efficiency (F v /F m ), quantum yield of PSII (U PSII ), and electron-transport rate (ETR) were maximal at 200-300 mM NaCl. Both nonphotochemical quenching (NPQ) and photochemical quenching (qP) were salt-independent. Interestingly, transferring the plants previously challenged with supraoptimal salinities (400-1000 mM NaCl) to the optimal salinity (200 mM NaCl) substantially restored their growth activity. Altogether, our results indicate that B. maritima is an obligate halophyte, requiring high salt concentrations for optimal growth, and surviving long-term extreme salinity. Such a performance could be ascribed to the plant capability to use sodium for osmotic adjustment, selective absorption of K + over Na + in concomitance with the stability of PSII functioning, and the absence of photosynthetic pigment degradation.

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Relationship between the photosynthetic activity and the performance of Cakile maritima after long‐term salt treatment

Cited by 76 publications

References 62 publications

Alleviation of phosphorus deficiency stress by moderate salinity in the halophyte Hordeum maritimum L.

Alleviation of phosphorus deficiency stress by moderate salinity in the halophyte Hordeum maritimum L.

Effects of NaCl or Na2SO4 salinity on plant growth, ion content and photosynthetic activity in Ocimum basilicum L.

Responses of Batis maritima plants challenged with up to two‐fold seawater NaCl salinity

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