PJB-2020-270
Biochemical responses of date palm (Phoenix dactylifera L.) to Red Palm Weevil (Rhynchophorus ferrugineus) (Olivier) infestation in Pakistan
Dr Mujahid Manzoor
Abstract
Plants respond through various biochemical, molecular and morphological mechanisms to counter the effects of insects attack. Biochemical defensive responses are of wide-range and highly dynamic. Herbivory defense mechanism in date palm through antioxidation has not been completely studied yet. Therefore, this study is associated with the antioxidative response of date palm (Phoenix dactylifera L.) cultivar “Hillawi” infested by red palm weevil (RPW) (Rhynchophorus ferrugineus). The results showed a marked reduction in growth and biochemical attributes in date palm under biotic stress. Chlorophyll a, chlorophyll b with total chlorophyll amount including carotenoides were reduced (7.51, 0.60, 15.54 & 0.31 µg/g) respectively. Infested date palms by RPW also showed as suitable increase in the total phenolic contents (10.82 mg/g), proline concentration (8.60 µmole/g), H2O2 (579.33 mmole/g), anthocyanin (0.0039 mg/g), malondialdehyde (MDA) (8.76 µmole/g FW), ascorbic acid (10 µmole/L FW), superoxide dismutase (SOD) (3.73 unit/min/g FW), peroxidase (POD) (2.82 unit/mint/g FW), catalase (3.96 mmole/mint/g FW), soluble proteins (7.84 mg/g), Glycine betaine (GB) (1.81 mg/g DW) and total sugars (39.66 mg/g). These results suggest that antioxidant enzymes form the primary defense line under herbivores attack which prevents oxidative damage in date palms.
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