کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4554762 | 1329228 | 2011 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency Effect of cytokinins on oxidative stress in tobacco plants under nitrogen deficiency](/preview/png/4554762.png)
Wild type and transgenic tobacco plants expressing isopentenyltransferase, a gene coding the rate-limiting step in cytokinin synthesis, were grown under limited nitrogen (N) conditions. Our results indicated that the WT plants subjected to N deficiency displayed reduced biomass and relative growth rates, increased levels of oxidative damage and reduced foliar concentrations of the different N forms. However, the transgenic plants expressing PSARK∷IPT, in spite of showing a significant decline in all the N forms in the leaf, avoided the alteration of the oxidative metabolism and maintained biomass and the relative growth rates at control levels, under suboptimal N conditions. These results suggest that the increased cytokinin synthesis in the transgenic plants is an effective mechanism to improve N-use efficiency.
► N-deficiency-induced senescence, the rise in ROS trigger oxidative stress.
► Transgenic plants expressing IPT gene coding the rate-limiting step in CKs synthesis.
► WT plants under N-limited, reduced biomass and increased the generation of ROS.
► Transgenic plants under N-limited, did not produce high ROS and maintained biomass.
► The expression of PSARK∷IPT in plants could improve nitrogen use efficiency.
Journal: Environmental and Experimental Botany - Volume 72, Issue 2, September 2011, Pages 167–173