286 



The Plant World. 



Such phenomena are analagous to Voechting's classic ex- 

 periment in which a bud from a second year beet which normally 

 would develop into a flowering shoot was grafted to a first year 

 beet and produced only the leafy cluster characteristic of the 

 first year growth. Results even more striking have but recently 

 been obtained by Edler who grafted white sugar beets upon the 

 common red table beet. No direct effect of the action of the 

 stock could be seen on the scion, but seeds from the scion were ob- 

 tained andthese the next year gave 71.3 percent white beets, 28.1 

 reddish, and .6percent red. Asthere was no sexual mixing, Edler 

 could only interpret this as a result of the grafting. In the second 

 geneiation these split up farther. The seed from the white beets 

 gave 53.3 per cent white, 25.5 reddish, and .1 per cent red. The 

 seed from the reddish gave 52.7 per cent white, 46 per cent red 

 or reddish, and 1 per cent white, and in a similar manner the seed 

 from the red beets broke up into red , white, reddish and reddish 

 orange. Grafting the red beets on the sugar beets gave 

 similar but less striking results. 



Finally, Winkler's recent remarkable experiment may be 

 mentioned. Winkler made a graft between tomato and night- 

 shade and fiom the cells formed by the fusion of the two callus 

 areas he caused a bud to regenerate. This bud then comes from 

 cells derived from both plants. As it developed into a leafy 

 shoot it showed both in leaf and stem structure the perfect char- 

 acters of each parent. Here, seemingly, is stock and scion ac- 

 tually fused into one. 



Arizona Agricultural 



Experiment Station. 



