1S12 



Plant Tissue Culture 



Fig. 51. Surface view of the region of elongation of a tomato 

 root grown in a solution containing indole acetic acid, showing the 

 scattered necrotic lesions resulting from plasmoptysis (explosion) 

 of many cortical cells. Compare with Fig. 56 wliich shows a com- 

 parable region of :i root grown in ;i nutrient Lacking indole acetic 

 acid, x 150. 



