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Salt‐Induced Regulation of Some Key Antioxidant Enzymes and Physio‐Biochemical Phenomena in Five Diverse Cultivars of Turnip ( Brassica rapa L.)
Author(s) -
Noreen Z.,
Ashraf M.,
Akram N. A.
Publication year - 2010
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.2010.00420.x
Subject(s) - cultivar , brassica rapa , shoot , catalase , brassica , proline , hoagland solution , chlorophyll , biology , brassica oleracea , superoxide dismutase , agronomy , malondialdehyde , photosynthesis , horticulture , chemistry , botany , antioxidant , biochemistry , amino acid
A greenhouse experiment was carried out to examine the differential morpho‐physiological responses of five cultivars of turnip ( Brassica rapa L.) to salt stress. Five diverse cultivars of turnip (shaljum desi surakh, shaljum purple top, shaljum golden bal, neela shaljum, and peela shaljum) were subjected for 6 weeks to varying levels of NaCl, i.e. 0, 80 and 160 m m in Hoagland’s nutrient solution in sand culture. Imposition of varying levels of salt substantially decreased shoot and root fresh and dry weights, chlorophyll contents, leaf osmotic potential, relative water contents, different gas exchange attributes, total phenolics, malondialdehyde, activities of superoxide dismutase, peroxidase catalase, and leaf and root K + levels while enhanced the proline contents, membrane permeability, level of H 2 O 2 , leaf and root Na + and Cl − and leaf Ca 2+ in all turnip cultivars under study. Of all cultivars, peela shaljum and neela shaljum were consistently higher in their growth than the other turnip cultivars at all salt concentrations of the growth medium. Photosynthetic capacity ( A ) and stomatal conductance ( g s ) were higher in high biomass‐producing cultivars, i.e. peela shaljum and neela shaljum, which provide to be potential selection criteria of salt tolerance in turnip. However, the regulation of antioxidant system was cultivar‐specific under saline conditions.