PJB-2021-539
Efficacy of seed priming with strigolactone (GR24) and its resilience feedback towards morphological and biochemical status of maize under salt stress
Iqra Iftikhar
Abstract
Plants respond to abiotic stresses by disrupting its normal bioenergetic processes via modification in morphological and biochemical activities. Phytohormones served as exogenous elicitors to restrict devastating effects of abiotic stresses. Strigolactones belongs to newly emerging signaling molecule, associated with multigenic responses due to its striking properties in plant metabolism. The current investigation was executed to evaluate potential roles of seed priming treatment with strigolactone synthetic analogue GR24 on morphological and biochemical attributes of maize under salt regimes. For this purpose, two maize lines (PB-ProA-2018 and PB-ProA-2019) were primed with five GR24 concentrations [non-soaked, water soaking, 0.001, 0.01, 0.1 mg/L] for 16 h. Seeds were soaked in sand culture and full strength Hoagland’s nutrient medium was applied to each pot throughout experimental duration. Two salt stress levels were applied [non-saline, 100 mM NaCl] as rooting medium. Salt stress significantly decreased all growth attributes while pre-sowing seed treatment with GR24 showed variable response to shoot and root fresh and dry weight. GR24 as pre-soaking seed treatment ameliorating devastating effects of salt stress by refining root length and total leaf area/plant. While shoot length decreased by GR24 seed priming treatment. Imposition of salt stress increased activities of catalase, peroxidase, leaf ascorbic acid, malondialdehyde and H2O2. Glycinebetaine and free proline were also increased under salt stress. Pre-soaking treatment with GR24 upregulated peroxidase (POD) and superoxide dismutase (SOD) activities, leaf ascorbic acid and free proline but decreased total phenolics contents. GR24 level 0.01 mg/L showed more prominent results to overcome salt stress outcomes. Among both maize lines PB-ProA-2019 performed better than PB-ProA-2018. Keywords: Zea mays; growth; enzymatic antioxidants; reactive oxygen species; osmolytes
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