|تعداد مشاهده مقاله||6,234,379|
|تعداد دریافت فایل اصل مقاله||4,571,729|
|Journal of Genetic Resources|
|دوره 9، شماره 1، اردیبهشت 2023، صفحه 48-58 اصل مقاله (632.34 K)|
|نوع مقاله: Research Article|
|شناسه دیجیتال (DOI): 10.22080/jgr.2023.24506.1336|
|Mehdi Moradyar؛ Mohammadreza Zamani* ؛ Mostafa Motallebi؛ Esmat Jourabchi|
|Department of Plant Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran|
|تاریخ دریافت: 26 مرداد 1401، تاریخ بازنگری: 26 آذر 1401، تاریخ پذیرش: 16 مهر 1402|
|The chitinase enzymes are known to play an important role in the plant defense system against phytopathogenic fungi. The effect of chimeric chitinase, which is chitinase-42 with a chitin-binding domain (ChBD), was previously analyzed in the T0 generation of the transgenic canola. In this research, three homozygous lines (pGFC3, pGFC13, and pGFC26) containing a single copy of the transgene (chimeric chitinases) on the two homologous chromosomes were selected in the T2 generation using a kanamycin-resistant marker (NPTII gene). The selected homozygous plants in T2 generation were induced by chitin as an elicitor in the greenhouse. The results of the semi-quantitative RT-PCR, chitinase enzyme activity, and growth inhibition of phytopathogenic fungi demonstrated that the synthetic inducible promoter of transgenic plants was induced by chitin. The results of chitinase activity of extracted protein from all transgenic lines containing inducible promoters showed a 3.2-5.8-fold increase in chitinase activity compared to non-induced plants. The antifungal activity of the inducibly expressed chitinase was examined on Sclerotinia sclerotiorum and Rhizoctonia solani. The results showed that fungal growth inhibition increased via elicitor treatment of the inducible promoter, 82% for S. sclerotiorum and 62% for R. solani, respectively. The result of light microscopic observation demonstrated morphological changes in hyphae and that the expressed enzyme can lyse the mycelial cell walls of R. solani. Moreover, resistance to S. sclerotiorum in the intact leaves of transgenic plants (T2) was confirmed using bioassay analysis. Based on these results, it seems that the synthetic inducible promoter containing F cis-acting element driving chimeric chitinase is suitable for increasing the resistance of the canola transgenic plant when attacked by phytopathogenic fungi.|
|Cis-acting element؛ Phytopathogenic fungi؛ Chitinase activity؛ Transgenic canola؛ Inducible promoter|
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