226 Mineral Nutrition of Plants 



SALT ACCUMULATION RELATIVE TO GROWTH AND METABOLISM 



EXCISED ROOTS 

 (BARLEY) 

 GROWN IN 

 UNCHANGED 

 DEPLETED 

 SOLUTION 



EXCISED ROOTS 



GROWN IN 



REPLENISHED 



SOLUTION 



YOUNG 

 ATTACHED 

 LEAVES Or 

 CUCURBITA 

 PEPO AND 



ELODEA 



INTERNODAL 

 CELLS OF 

 NITELLA 

 AND CHARA 

 MATURE ATTACH- 

 ED LEAVES OF 

 CUCURBITA 

 PEPO AND 

 ELODEA 



slowlTgrow- 

 ing cells of 



VALONIA 



ACTIVE 



CELL 



DIVISION 



RAPIDLY 



METABOLISING 



CELLS WITH 



LOW SALT 



CONTENT 



MATURE CELLS 



RESTORED 



TO ACTIVE 



GROWTH AND 



METABOLISM 



RAPID 

 ABSORPTION 



RAPIDLY 



GROWING CELLS 



WITH HIGH 



SALT CONTENT 



ACCUMULATION 



DEPENDENT ON 



FURTHER 



GROWTH 



RENEWED 



RAPID 



ACCUMULATION 



DECREASING 



CAPACITY 



TO ACCUMULATE 



MATURING 



CELLS WITH 



HIGH SALT 



CONTENT LOW 



METABOLISM 



AND STRICTLY 



LIMITED 



GROWTH 



ACCUMULATIO N 



SUSPENDED 



DORMANT 



MATURE CELLS 



WHICH HAVE 



CEASED 

 GROWTH AND 



ACTIVE 

 METABOLISM 



ACCUMULATION 

 CEASES 



FULLY MATURE 



LIVING CELLS 



INCAPABLE 



OF FURTHER 



GROWTH 



SURFACE 



CELLS Of CUT 



DISCS FROM 



POTATO, 



ARTICHOKE 



ETC. WITH 



ADEQUATE 



AERATION AND 



TEMPERATURE 



CELLS OF 

 INTACT STOR- 

 AGE ORGANS 



POTATO. CARROT 

 ARTICHOKE, 



DAHLIA TURNIP 

 BEET ETC 

 CELLTOF CUT 



DISCS OF POTATO 



ETC WITH LOW 0, 

 AND/OR LOW 

 TEMPERATURE 



PARENCHYMA OF APPLE AND PEAR 

 PARENCHYMA OF BULB SCALES 

 ISOLATED COTYLEDONS Of PEA & BEAN 

 POTATO STORED AT Z'-VC. 

 MATURE CELLS OF VALONIA 

 RED BLOOD CELLS 



Figure 21. Classification of representative types of plant tissues and cells 

 with regard to their ability to accumulate inorganic solutes.— Steward (75) 



