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Photosynthetic responses of tomato leaves to salt and cadmium stresses: growth and chlorophyll a fluorescence kinetic analyses

100%

Gharbi F., Zribi L., Daly A. B., Rejeb S., Hanchi B.

Polish Journal of Environmental Studies

2018

tom 27

nr 6

This study investigated the effects of salinity (NaCl) and cadmium (Cd) on leaf growth and photosynthetic parameters of tomato plants (Solanum lycopersicum cv. Rio Grande). Cd and NaCl treatments considerably reduced leaf dry matter and leaf area of tomato plants. Stomatal conductance decreased significantly with increased NaCl and Cd in the growth medium, with the decrease occurring at an early stage under Cd treatments. For the fluorescence parameters, there was no significant difference in the maximum quantum efficiency of PSII (Fv/Fm) for either type of stress. However, the quantum yield of PSII photochemistry (ΦPSII), photochemical quenching (qp), and the intrinsic efficiency of PSII (Фexc) decreased significantly under both NaCl and Cd treatments. Decreases in ΦPSII, qp, and Фexc were coupled with a significant increase in non-photochemical quenching (NPQ), and the highest NPQ was obtained in NaCl-treated plants. The correlation between electron transport rate (ETR) and stomatal conductance showed that stomatal closure is associated with a down-regulation of ETR, which is compensated by an increase in non-photochemical quenching.

Variation of phenolic composition and biological activities in Limoniastrum monopetalum L. organs

72%

Trabelsi N., Falleh H., Jallali I., Daly A. B., Hajlaoui H., Smaoui A., Abdelly C., Ksouri R.

Acta Physiologiae Plantarum

2012

tom 34

nr 1

Changes in phenolic composition and biological activities were investigated in different Limoniastrum monopetalum L. organs. For that, 80% aqueous acetone extracts were used to estimate total phenolic contents and their antioxidant activities were evaluated using DPPH and O₂ radical scavenging activities and reducing power. The efficiency of organ extracts was tested against human pathogen strains. Ultimately, acid hydrolysis of all organs was subjected to RP-HPLC for phenolic identification. Results showed that flower extracts exhibited the highest polyphenol (65.42 GAE/g DW) and flavonoid (35.36 CE/g DW) contents. Stems were enriched in condensed tannin content (21.4 mg CE/g DW) and displayed the best antiradical activities and the highest reducing power. Besides, stem and gall extracts showed the highest efficiency against pathogenic bacteria as compared with those of flower. Concerning the antifungal test, a slight activity was found in gall extracts. The RP-HPLC showed a difference in phenolic compounds that varied as function of organ. In fact, the major phenolic compound varied as function of organ. Results suggest that L. monopetalum could be a promising source of biomolecules for therapeutic and nutraceutical industries and the difference between organs may be related to their physiological role.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Polish Journal of Environmental Studies

2 Daly A. B.

1 Abdelly C.

1 Falleh H.

1 Gharbi F.

1 Hajlaoui H.

1 Hanchi B.

1 Jallali I.

1 Ksouri R.

1 Rejeb S.

1 Smaoui A.

1 Trabelsi N.

1 Zribi L.

1 2018

1 2012

Wyniki wyszukiwania

Photosynthetic responses of tomato leaves to salt and cadmium stresses: growth and chlorophyll a fluorescence kinetic analyses

Variation of phenolic composition and biological activities in Limoniastrum monopetalum L. organs