1,721,035 research outputs found
Diversity in the response of two potential halophytes (Batis maritima and Chritmum maritimum) to salt stress
No full textIdentification of morphological, biochemical and physiological parameters useful to characterize nutritional stress status in arboreous species differently tolerant to chlorosis
No full textEffect of municipal solid waste compost and sewage sludge on enzymatic activities and wheat yield in a clayey-loamy soil. Soil Science
No full textPhotosynthetic responses to salinity in two obligate halophytes: Sesuvium portulacastrum and Tecticornia indica
No full textSeedlings of the obligate halophytes Sesuvium portulacastrum L. and Tecticornia indica (Willd.) subsp. indica were grown with 0, 200, or 400 mM NaCl for 13 weeks to investigate whether salt tolerance was related to maintenance of adequate photosynthetic activity and pigment equipment. Both species showed growth optimum at 200 mM NaCl and better tissue hydration under salinity but different photosynthetic response to salinity. CO2 assimilation rate and stomatal conductance of S. portulacastrum were highest at 200 mM NaCl, while in T. indica they decreased with salinity. Pigment content increased under salinity in both species. The de-epoxidation state in S. portulacastrum suggests the need for energy dissipation at 400 mM NaCl, while its salt-induced decline in T. indica, despite the reduced photochemistry, suggests the involvement of adaptive mechanisms other than the xanthophyll cycle
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Salinity tolerance of quinoa (Chenopodium quinoa Willd) as assessed by chloroplast ultrastructure and photosynthetic performance
No full textSea fennel (Crithmum maritimum L.) under salinity conditions: a comparison of leaf and root antioxidant responses
No full textThe present study was carried out to compare the effect of NaCl on growth, cell membrane
damage, and antioxidant defences in the halophyte
Crithmum maritimum L. (sea fennel). Physiological
and biochemical changes were investigated under
control (0 mM NaCl) and saline conditions (100 and
300 mM NaCl). Biomass and growth of roots were
more sensitive to NaCl than leaves. Roots were
distinguished from leaves by increased electrolyte
leakage and high malondialdehyde (MDA) concentration.
Superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities, ascorbic acid (AA) and glutathione (GSH) concentrations were lower in the roots than in the leaves of control plants. The different activity patterns of antioxidant enzymes in response to 100 and 300 mM NaCl indicated that leaves and roots reacted differently to salt stress. Leaf CAT, APX and glutathione reductase
(GR) activities were lowest at 300 mM NaCl, but they were unaffected by 100 mM NaCl. Only SOD activity was reduced in the latter treatment. Root SOD activity was significantly decreased in response to 300 mM NaCl and root APX activity was significantly higher in plants treated with 100 and 300 mM compared to the controls. The other activities in roots
were insensitive to salt. The concentration of AA
decreased in leaves at 100 and 300 mM NaCl, and in
roots at 300 mM NaCl, when compared to control plants. The concentrations of GSH in NaCl-treated leaves and roots were not significantly different from the controls. In both organs, AA and GSH were predominating in the total pool in ascorbic acid and glutathione, under control or saline conditions
Some physiological and biochemical traits of salt tolerance in the salt march halophyte: Sesuvium portulacastrum
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