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Particle Swarm Optimization with directed mutation

Journal of Donghua University(English Edition) 2016年第5期33卷 774-780页

作者：王杰李红文 School of Electrical Engineering Zhengzhou University College of Electrical Engineering Zhengzhou University

In the standard particle swarm optimization(SPSO),the big problem is that it suffers from premature convergence,that is,in complex optimization problems,it may easily get trapped in local optima.In order to mitigate premature convergence problem,this paper presents a new algorithm,which is called particle swarm optimization(PSO) with directed mutation,or DMPSO.The main idea of this algorithm is to "let the best particle(the smallest fitness of the particle swarm) become more excellent and the worst particle(the largest fitness of the particle swarm) try to be excellent".The new algorithm is tested on a set of eight benchmark functions,and compared with those of other four PSO variants.The experimental results illustrate the effectiveness and efficiency of the DMPSO.The comparisons show that DMPSO significantly improves the performance of PSO and searching accuracy.

关键词： directed mutation global optimization particle swarm optimization(PSO)

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Reducing phosphorylation of nitrate reductase improves nitrate assimilation in rice

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Journal of Integrative Agriculture 2022年第1期21卷 15-25页

作者： HAN Rui-cai LI Chen-yan Adnan RASHEED PAN Xiao-hua SHI Qing-hua WU Zi-ming Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of Education/College of AgronomyJiangxi Agricultural UniversityNanchang 330045P.R.China Rice Research Institute Jiangxi Academy of Agricultural Sciences/Jiangxi Provincial Key Laboratory for Physiology and Genetics of RiceNanchang 330200P.R.China

Nitrate reductase(NR) is an important enzyme for nitrate assimilation in plants, and post-translational phosphorylation regulates NR activity. To evaluate the impact of the dephosphorylation of nitrate reductase 1(NIA1) protein on NR activity,nitrogen metabolism and plant growth, NIA1 phosphorylation site directed mutant lines(S532 D and S532 A) and an OsNia1 over-expression line(OE) were constructed, and the phenotype, NIA1 protein and its phosphorylation level, NR activity,nitrate metabolism and reactive oxygen metabolism of the transgenic lines were analysed. Exogenous NIA1 protein was not phosphorylated in S532 D and S532 A mutant lines, and their NR activities, activity states of NR and assimilation efficiencies of NO3–-N were higher than those in Kitaake(WT) and OE. The changes in these physiological and biochemical indexes in the OE line were less than in S532 D and S532 A compared to WT. These results suggest that the removal of transcriptional level control had little effect on nitrogen metabolism, but the removal of post-translational modification had a profound effect on it. With the removal of NIA1 phosphorylation and the improvement in the nitrate assimilation efficiency, the plant height and chlorophyll content of S532 D and S532 A decreased and the hydrogen peroxide and malondialdehyde contents of rice seedlings increased, which may be related to the excessive accumulation of nitrite as an intermediate metabolite. These results indicated that the phosphorylation of NR may be a self-protection mechanism of rice. The reduced phosphorylation level of nitrate reductase improved the assimilation of nitrate, and the increased phosphorylation level reduced the accumulation of nitrite and prevented the toxic effects of reactive oxygen species in rice.

关键词： rice(Oryza sativa L.) nitrate reductase phosphorylation directed mutation nitrogen metabolism

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