PJB-2022-175
EFFECTS OF GIBBERELLIC ACID AND ABSCISIC ACID SEED PRIMING ON PHYSIOLOGICAL, BIOCHEMICAL AND METABOLIC PROCESSES OF RICE UNDER SALT STRESS
Nazneen Akhtar
Abstract
Pakistan. Different priming techniques have been used to reduce or lessen the deleterious affects of salinity on plant growth. The present study was conducted to investigate the effects of hormonal priming on seed germination, seedling vigour, cellular injury, ionic content, concentration of photosynthetic pigments, proline accretion, glycine betaine, and accumulation of total soluble sugars and total soluble proteins of rice seedlings in rice cultivar Shaheen Basmati. Rice seeds were primed for 24 hours in dark in gibberellic acid (50, 100 and 150 mg/l), Abscisic acid (2.5 and 5 µM) and grown in 0, 50, 100 and150 mM sodium chloride solutions in hydroponic water culture. Hydroprimed seeds were taken as control. The current study showed that germination rate, germination percentage, root and shoot length, fresh and dry weights of roots and shoots, potassium and calcium ions, chlorophyll a, b and total carotenoid content was decreased with increasing salinity but the seedlings raised from seeds primed with phytohormones lessened the salinity affects to a considerable extent. Cellular injury, sodium ions content, total proline and glycine betaine content, total soluble sugars content, were increased with increasing salinity but the PGRs’ pretreatment reduced them significantly under both normal and saline conditions. Total soluble protein increased with increasing salinity and priming treatments also enhanced it. The results are very promising as very low quantities of PGRs are used in the seed pretreatment as its any harmful effects on environment and human health can be avoided.
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