PJB-2018-998
The effect of PEG simulated drought stress on the biochemical constituents of tomato genotypes
Rizwan Taj Khan
Abstract
An experiment was performed in greenhouse conditions to study the effect of PEG (6000) induced stress on the Proline, Phenolics, flavonoids, reducing and non-reducing sugar contents of twenty-six genotypes of tomato. Five treatments of Polyethylene glycol (PEG) Control, 5%, 7.5%, 10% and 12.5% were applied. The leaf extract was used to quantify the proline contents. The proline contents in all the genotypes of tomato were increased. The maximum proline content was observed by G-45-19212 which was 54.5 mg/g. The proline contents 20.7 mg/g at control was observed in G 31 00623 and minimum 16. 5 mg/g was observed in the G-8-19219. The maximum phenolic contents 60 µg / g were observed in the genotype G-38-19896 and minimum 5 µg / g were recorded in the G 19219 at control (without PEG). Reducing sugars were not highly variable among different genotypes. The maximum amount of reducing sugars (8mg/ml) was found in the G-8-19219 and minimum (4mg/ml) was observed in genotype G-12- 17860. The amount of non-reducing sugars was significantly different in tomato genotypes investigated. The maximum amount of non-reducing sugars (7mg/ml) was measured in the genotype G-7-88527 and minimum 1mg/ml in the genotype G-6-017909. The remaining all genotypes indicated the sugar amounts between these values.
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