Effect of Corona Treatment and Dielectric Separation on Seed Vigor of Hybrid Rice

摘要

cqvip:[Objectives] The aim was to investigate the effects of corona field and dielectric separation on the seed vigor of hybrid rice. [Methods] The seeds of6 hybrid rice varieties were processed with corona field,dielectric separation and corona field + dielectric separation. [Results] When the field intensity was200 km/m and the processing time was 4 min,the seed vigor was significantly increased. The seed vigor of Y Liangyou 9918( 2014) increased the most,and the germination potential and the germination rate increased by 17 and 12 percentage points respectively compared to the control. Corona field reduced seed conductivity,and for seedlings,it decreased their MDA content,increased proline content,improved peroxidase activity,and enhanced root activity. When the rotating speed of the drum was 30 r/min,the dielectric separation voltage of 4 500 V could achieve good separation effect,and the vitality of seeds at different grades was significantly different. Under the optimized corona field combined with optimized voltage processing of dielectric separation,the seed vigor at all grades from the separation was significantly higher than that of the dielectric separation processing alone. The combined separation processing separated no seeds with germination rate of higher than 80% from the hybrid rice seeds with germination rate of lower than 60%,yet it could effectively separate the seeds with germination rate of higher than 80%from the hybrid rice seeds with germination rate of 65%-70%. After the combined processing,the germination rates of separated Grade I seeds of Wangliangyou6( 2015),N Liangyouhuazhan( 2015),Wangliangyou 6( 2016) increased by 20,15,20 percentage points from the germination rates of the control,while the germination rates of N Liangyouhuazhan( 2016) and Y Liangyou 9918( 2016),which had the germination rates of higher than 80%,increased by 3 and 9 percentage points from the control,suggesting insignificant separation effect. [Conclusions] This study provided a new technical approach for the processing of hybrid rice seeds.