Physiological and biochemical changes induced by Qiangdi nano-863 biological assistant growth apparatus during rice seed priming under temperature stress.

A Younas,S Fiaz,S Huang,S Hussain,Z Yousaf,W Xiukang,A Riaz

doi:10.1590/1519-6984.245206

Abstract

A huge amount of rice cultivation and consumption occur in Asia particularly in Pakistan and China. However, multiple abiotic stresses especially high and low-temperature proved to be a substantial threat for rice production ultimately risks for food security. To overcome various types of abiotic stress; seed priming is among the effective approaches to improve the rice seed germination and growth vigor. Therefore, the present study was planned to evaluate physiological and biochemical modifications in Chinese and Pakistani rice varieties by Qiangdi 863 biological assistant growth apparatus nano treated water (NTW), Osmopriming Calcium chloride (CaCl2), redox priming hydrogen peroxide (H2O2) and hormonal priming by Salicylic acid (SA) under temperature stress conditions. The experiment was performed with completely randomize design conditions. Five rice varieties, nomenclature 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 conditions. The present study indicated that nanopriming were the most effective treatments increased Germination Energy Percentage (GEP) (96.1, 100, 100%), Speed of Germination (SG) (27.2, 35.45, 37.1), Final Germination Percentage (FGP) (98.2, 99.1, 99.4%), Seedling Dry Weight Biomass (DWB) (0.1, 0.137, 0.14g), Total Chlorophyll Content (0.502, 13.74, 15.21), antioxidant enzymes Superoxide Dismutase (SOD)(3145, 2559, 3345 µg-1FWh-1), Catalase (CAT) (300, 366, 3243 µg-1FWh-1) and decreased Malondialdehyde (MDA) (6.5, 12.2, 6.5 µmol g-1 FW) for Zhongzao 39 and KSK 133 rice varieties under low (LT+NTW), optimal temperature (OP+NTW) and high temperature (HT+NTW) stress., Therefore, nano-priming is recommended to cope with the high and low-temperature stress conditions along with improved productivity of rice.

Highlights

Rice (Oryza sativa L.) has been nurtured for an immense portion of the realm’s populace in Western Asia, the Mid East, and the Caribbean region (FAO, 2005)
The germination energy percentage, speed of germination and final germination percentage significantly increased in nano treated water (NTW) primed seed at all temperatures
In our results showed that high temperature (HT)+H2O2 improved germination and dry biomass but less than NTW+HT treatment conditions

Summary

Introduction

Rice (Oryza sativa L.) has been nurtured for an immense portion of the realm’s populace in Western Asia, the Mid East, and the Caribbean region (FAO, 2005). A huge amount of rice cultivation and consumption occur in Asia in China and Pakistan (Datta and Adhya, 2014). It is cultivated in more than 100 countries which can deliver more than 483 million tons of milled rice every year (Dass et al, 2017). The demand for rice probably rise due to increase in consumption up to 496 million tons (mt) in 2020, and 555 mt by 2035 (FAO, 2005). Asia is cultivating rice on a vast scale due to excessive field area, and that’s why its demand and supply are going smoothly and steadily until now. Expected trade of rice all over the world record in 2022 will be (000 tons) USA 3320 tons, Thailand 11,000 (000 tons), Pakistan 4300 (000 tons), China 1800 (000 tons) (Younas et al, 2020)

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Discussion

Conclusion