enhanced low temperature stress tolerance
tomato : An approach
Meena1*, D.S. Khurana1, Nirmaljit Kaur2 and
Vegetable Science, Punjab Agricultural University, Ludhiana -141 004, India
Botany, Punjab Agricultural University, Ludhiana -141 004, India
Paper received : 13.02.2017
Revised received : 12.06.2017
Re-revised received :
Accepted : 11.01.2018
Aim: The aim of the
present study was to find suitable concentration of phenolic compounds to
ameliorate the effect of low temperature stress in tomato under open field
conditions during winter season.
average minimum temperatures were below 10oC from mid December to mid
February during both the years. The experimental plants were given foliar
application twice, first 15 days after transplanting followed by another
spray after a fortnight of five different phenolic compounds viz.,
salicylic acid, sulfo salicylic acid, benzoic acid, methyl salicylic acid and
acetyl salicylic acid with different concentrations of 0.1 mM, 0.5 mM and 1.0
mM in order to evaluate their effect on morphological, physiological, yield
and quality traits.
Results: The results obtained revealed that low temperature
during winter season significantly reduced the growth and physiological
traits (leaf are a index, specific leaf area, relative growth rate, net
assimilation rate and relative water content), yield attributes (number of
flower per cluster, number of fruits and fruit yield) and quality parameters
(lycopene, β-carotene and α-tocopherol) and increased specific leaf
weight and electrolyte leakage. However, application of phenolic compounds
significantly enhanced the growth, yield, quality and decreased electrolyte
leakage and specific leaf weight under stress. Among all treatments, SA (1.0
mM) was found most effective to enhance low temperature stress tolerance in
stress is one of the environmental cues that limits the crop production.
Phenolic compounds play a significant role as signaling molecules in
conferring cold stress tolerance in plants. It may thus be concluded that
foliar application of salicylic acid (SA) (1.0 mM) enhanced low temperature
stress tolerance in tomato.
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