induced physiological and biochemical changes under polyethylene glycol-6000
water deficit stress in wheat seedlings
S. Sapre1* and D. N. Vakharia2
Agriculture, Junagadh Agricultural University, Amreli-365 601, India
Biochemistry, College of Agriculture, Junagadh Agricultural University,
Junagadh-362 001, India
Author E-mail: email@example.com
received : 21.11.2015
received : 06.05.2016
received : 30.07.2016
Accepted : 12.09.2016
Aim: The experiment was
conducted to study the role of foliar application of silicon (SiO2)
under water deficit stress in wheat seedling stage by evaluating the
physiological and biochemical parameters.
of silicon was made on 7th and 14th days after
germination (DAG) to the seedlings of wheat (Triticum aestivum L.)
varieties followed by imposition of polyethylene glycol- 6000 (PEG) induced
stress on 15th DAG. The samples were analyzed after 24 hours for
relative water content (RWC), membrane stability index (MSI), total
chlorophyll, proline, malondialdehyde (MDA), peroxidase (POX), catalase (CAT)
and silicon content.
of silicon followed by water deficit conditions increased RWC compared to PEG
stress. There was a meagre percent variation in MSI in SiO2 and
SiO2 + PEG treatments as compared to PEG and control. The SiO2
treatment enhanced antioxidative enzymes in most cases. Positive correlations
(P<0.01) were observed between enzymatic antioxidants, RWC and MSI, while
MDA and proline displayed positive correlation (P<0.01). Silicon was able
to ameliorate stress conditions as reflected by a significant rise in RWC
(17.69%), MSI (55.80%), antioxidant enzyme level i.e. POX (77.97%), CAT
(89.32%) and a significant decline in proline content (36%).
foliar silicon treatment can be used as a promising alternative to mitigate
water stress induced damage in wheat seedlings.
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