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Oxidative stress and antioxidative system in aerobic rice (Oryza sativa L.) under water limiting conditions

KrishiKosh

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Title Oxidative stress and antioxidative system in aerobic rice (Oryza sativa L.) under water limiting conditions
 
Creator Dalal, Sudha
 
Contributor Jain, Veena
 
Subject Rice, Irrigation, Planting, Enzymes, Vegetative propagation, Weather hazards, Tolerance, Antioxidants, Biological phenomena, Hydroponics
 
Description Four indica/Basmati and aerobic rice varieties (HBC19, HKR47, MAS25 and MAS26) were
used to study various morpho-physiological, biochemical parameters under water limiting
conditions. For this the plants were grown in pots and were subjected to flooded as well as aerobic
water conditions and in another experiment PEG induced water stress of -1 and -2 bar was generated
in hydroponic conditions. Aerobic rice genotypes performed better than indica/Basmati rice varieties
under aerobic as well as water stressed conditions in all aspects of physio-morphological and biochemical
attributes. Large deviation was observed in all rice genotypes for shoot length, root length, dry shoot
weight and dry root weight in six weeks old seedlings when grown under aerobic conditions and in
hydroponic system (at -1 and -2 bar). Relative water content (RWC) and osmotic potential reduced
significantly under water limiting conditions in all the varieties. The production of toxic reactive oxygen
species (ROS) (viz. .O2
- and H2O2) and lipid peroxidation (MDA), which is an indicator of cell
membrane damage also increased in all the cultivars with higher level of increment in the
conventional cultivars than aerobic rice varieties. The total level of ascorbic acid glutathione and
proline was higher in aerobic rice varieties under water limiting conditions in both the experiments.
Water stress had differential effect on antioxidant enzyme activities in shoots and roots of
conventional and aerobic cultivars. Under hydroponic system, SOD activity increased in all the
cultivars however, the increase was higher in aerobic rice varieties. Though it declined in all the
cultivars under aerobic conditions in pot experiment, yet the total activity in aerobic genotypes under
water limiting conditions was higher than that of conventional varieties under control conditions.
CAT activity decreased in shoots of all rice cultivars however, in roots the CAT activity remained
unchanged and increased in conventional rice varieties and decreased in aerobic rice varieties grown
under aerobic conditions. Under hydroponic conditions CAT activity enhanced at -1 bar but declined
at -2 bar level of stress in both shoots and roots. Water stress resulted in increased activity of POX
and APX in both tissues of all the cultivars in both the experiments but absolute were significantly
more in MAS25 and MAS26. Water stress decrease GR activity in shoots but GR activity increase in
roots in all the varieties yet the total values were higher in aerobic rice varieties.
 
Date 2016-09-15T08:49:36Z
2016-09-15T08:49:36Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76784
 
Language en
 
Format application/pdf
 
Publisher CCSHAU