PJB-2019-1051
BIOCHEMICAL AND PHYSIOLOGICAL CHANGES, INDUCDED BY SEED PRIMING TECHNIQUES IN CHINESE AND PAKISTANI RICE VARIETIES UNDER STRESS
Afifa Younas
Abstract
Rice is a cash crop for China and Pakistan. Almost 80% of people from both countries depend on the rice to satisfy their food need. Multiple abiotic stresses affect productivity of rice and threaten food security. To overcome various types of abiotic stress seed priming is one of the effective approaches to improve the rice seed germination and growth vigor. Hence, the present study was planned to evaluate the physiological and biochemical modifications in Chinese and Pakistani varieties by different priming techniques (osmopriming Calcium chloride (CaCl2), redox priming hydrogen per oxide (H2O2) and hormonal priming Salicylic acid (SA)) under temperature stress conditions. The experimental Design was performed with Split blocked completely randomize design conditions. Five varieties, named as Zhongzoa 39, (Chinese rice variety) KSK 133, KS 282, Super basmati and PK 1121 aromatic (Pakistani rice variety) were sown under low temperature (LT) (17ºC) optimal temperature (OT) (27ºC) and high temperature (HT)(37ºC). Results of present study showed that the osmo-priming and redox priming was most effective treatment, increased germination energy percentage (GEP), speed of germination (SG), final germination percentage (FGP), seedling dry weight biomass (DWB), total chlorophyll content, anti-oxidant enzymes superoxide dismutase (SOD), catalase (CAT) and decreased malondialdehyde (MDA) for five rice varieties under low and high temperature stress. At optimal temperature osmo priming (OP+CaCl2) significantly improved most of germination, growth and anti-oxidant enzymes attribute. Therefore, osmo and redox priming techniques are recommended to cope the high and low temperature stress conditions in Pakistani and Chinese varieties.
To Cite this article:
Download
