114 



Plant Tissue Culture 



Fig. 35. Bean pod segments used as test material for plant 

 wound stimulants. Above: segments from the centers of five 

 selected pods, each divided into six pieces so thai each piece con 

 tains tlic depression lefl by a single ovule. Center, left: ;i drop of 

 the solution under investigation is placed in each depression and the 

 series placed in ;i moisl chamber; right: :i similar scries 48 hours 

 later showing ;i small intumescence ;it the site of each drop of 

 liquid. Below, top row: sections through ;i control series treated 

 with distilled water; bottom row: ;i similar series treated with :i 

 solution of ' ' traumatin. " (From Bonner, J., and English, .1. 

 L938. Planl Physiol. 13: 335, fig. 1. • 



