On the MS medium supplemented with 2 ppm 2,4-D,calli were induced after 4-6weeks from the petioles of an American celery plant (Apium graveolens var.Dulce pers.c
This paper reports a new transgenic tobacco line NC89 resistant to both tobaccomosaic virus(TMV)and cucumber mosaic virus(CMV).It deals with the details of fiel