Abstract:

Low energy N⁺ion implantation technology is used in the mutat ion breeding and fermentation on g lutamic acid yielding start ing st rains of D110 and D110B.It is showed in this study that tw o high yielding glutamic acid st rains D5221 and B3263 are screened out and the average rocker bot tle fermentation GA(%)can achieve 8.4 %、7.5 %, they are respectively raised by 35.48 %、25 % compared to the original strains.There are clearly improved in the aspect on the fi rst class seed fermentation curve.And thei r log arithm phase has generally improved by 2 ～ 3 h.From the fermentation curve it is showed that thei r metabolic capacity are improved, the multiplicat ion cycle are shortened.So it w ill play a positive role in reducing the fermentation cycle.

Key words: ion implantation, glutamic acid, mutation breeding, fermentation