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Salt (NaCl)‐Induced Modulation in some Key Physio‐Biochemical Attributes in Okra ( Abelmoschus esculentus L.)
Author(s) -
Saleem A.,
Ashraf M.,
Akram N. A.
Publication year - 2011
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.2010.00453.x
Subject(s) - abelmoschus , transpiration , chemistry , stomatal conductance , shoot , horticulture , proline , chlorophyll , cultivar , chlorophyll fluorescence , chlorophyll b , agronomy , botany , photosynthesis , biology , biochemistry , amino acid
Salt (NaCl)‐induced regulation of some key physio‐biochemical characteristics in two okra ( Abelmoschus esculentus L.) cultivars (Nirali and Posa Sawni) was examined under greenhouse conditions. Plants of both cultivars were subjected for 30 days to sand culture salinized with four salt levels [0 (control), 50, 100 and 150 m m NaCl] in Hoagland’s nutrient solution. Salt stress significantly reduced the shoot and root fresh weights, transpiration rate, chlorophyll b content, net CO 2 assimilation ( A ), transpiration rate ( E ), while enhanced leaf and root Na + and Cl – concentrations in both cultivars. In contrast, chlorophyll a content, stomatal conductance ( g s ), leaf internal CO 2 ( C i ), C i /C a ratio, water‐use efficiency ( A/E ) and fluorescence characteristics such as photochemical quenching (qP), non‐photochemical quenching (NPQ), efficiency of PS‐II ( F v /F m ), proline contents, and leaf and root K + , Ca 2 + and N contents remained almost unaffected in both lines due to salt stress. The efficiency of PSII ( F v /F m ), A , chlorophyll b , root fresh weight and root N were higher in relatively salt tolerant cv. Nirali, whereas leaf Na + and root Cl – were higher in cv. Posa Sawni. The relatively more reduction in growth in the cv. Posa Sawni was found to be associated with higher accumulation of Na + in its leaves and Cl – in roots.