TIB for Micropropagation and the Relationship between Anthocyanins and Chlorophyll of Strawberry Seedlings

In this study, we employed a temporary immersion bioreactor(TIB)system for the micropropagation of strawberry seedlings. The TIB method and the conventional method for the micropropagation of strawberry seedlings were compared in terms of explant propagation coefficient, seedling fresh weight,contents of anthocyanins and chlorophyll, and photosynthetic characteristics. The results showed that an inoculation density of 40 explants/L was suitable for the micropropagation of ’Benihope’ strawberry seedlings in the TIB. The propagation coefficient, fresh weight, photosynthetic rate, stomatal conductance, transpiration coefficient, and the contents of total anthocyanins and chlorophyll of seedlings micropropagated in the TIB were significantly higher than those of the seedlings micropropagated by the conventional method. In conclusion, the TIB method was superior to the conventional method in the micropropagation of strawberry seedlings.The negative reciprocity did not occur between anthocyanins and chlorophyll in strawberry seedlings cultured under forced ventilation such as TIB.

VIGS结合HIGS诱导的烟草对斜纹夜蛾与棉铃虫的抗性比较

为探索防控斜纹夜蛾和棉铃虫的新途径,比较研究了病毒诱导表达昆虫NDUFV2(NV2)基因片段的烟草植株对斜纹夜蛾与棉铃虫的抗性。以含SliNV2370或HaNV2370基因片段的CMV或TRV重组质粒-农杆菌,采用质粒-农杆菌浸润法接种本氏烟植株,将RT-PCR检测接种成功的本氏烟植株用于斜纹夜蛾或棉铃虫抗性试验,并采用RT-qPCR分析斜纹夜蛾和棉铃虫NV2基因表达量。结果表明:通过CMV载体或TRV载体表达SliNV2370基因片段的本氏烟植株都未能显著增强对斜纹夜蛾的抗性;斜纹夜蛾SliNV2基因表达量下降了19%左右,但沉默SliNV2基因的效果都没有达到差异表达基因的水平。CMV载体或TRV载体表达HaNV2370基因片段的本氏烟植株,都能显著增强对棉铃虫的抗性,分别提高36.5%和31.5%。棉铃虫HaNV2基因表达量分别下降了72.5%和78.7%,沉默HaNV2基因的效果都达到了差异表达基因的水平。说明通过CMV载体或TRV载体表达NDUFV2(NV2)基因片段的本氏烟植株未能显著增强对斜纹夜蛾的抗性,但能显著增强对棉铃虫的抗性。