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  • Author: Jianquan Liu x
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Xiangyan Zhou, Jingfang Ma, Wangtian Wang, Na Gong, Yanyun zhang and Jianquan Liu

Genome Size of the Diploid Hybrid Species Hippophae goniocarpa and Its Parental Species, H. rhamnoides ssp. sinensis and H. neurocarpa ssp. neurocarpa (Elaeagnaceae)

Hybridization may induce rapid genomic changes, including gain or loss of DNA. We examined nuclear DNA content of a diploid hybrid species, Hippophae goniocarpa and its two parental species. The nuclear 2C DNA value was 2.95±0.08 pg for H. goniocarpa; for the parental species it ranged from 2.54±0.09 pg to 2.66±0.12 pg for H. rhamnoides ssp. sinensis and from 3.15±0.19 pg to 3.49±0.06 pg for H. neurocarpa ssp. neurocarpa. The nuclear DNA content of H. goniocarpa was intermediate between those of the two parental species, confirming that this species is of diploid hybrid origin and further suggesting that it is in an early stage of the process of speciation.

Open access

Yang Liu, Rongjiang Yang, Jianquan Lu, Bo Wu and Xiushan Cai

This paper is devoted to studying the globally exponential stability of impulsive high-order Hopfield-type neural networks with time-varying delays. In the process of impulsive effect, nonlinear and delayed factors are simultaneously considered. A new impulsive differential inequality is derived based on the Lyapunov-Razumikhin method and some novel stability criteria are then given. These conditions, ensuring the global exponential stability, are simpler and less conservative than some of the previous results. Finally, two numerical examples are given to illustrate the advantages of the obtained results.