INDEX 



273 



Xylem, different layers concerned in 

 transport, 101, 103, 104, 110 

 direction of movement through, 4, 

 5, 7-10, 88-99, 101, 103, 105, 

 109, 118 

 downward transport in, 7, 88-106 

 hormone transport in, 97, 98, 100 

 movement of sohitions introduced 

 into, 4, 5, 7, 10, 75, 88-94, 

 100-105, 109-112 

 nitrogen transport in 51, 52, 56, 

 58-64, 77-86, 149, 150, 200 

 {See also Nitrogen) 



Xylem, plugging of, 27, 36, 43, 53, 

 94, 100, 103, 104, 125-131 

 tests for, 125 

 rates of transport through, 4, 92, 



93 

 secretion into, 79n. 

 sugar in, 5, 6, 9, 12, 80, 94, 101, 

 105, 116-124 

 as influenced by temperature, 

 118, 119 

 upward movement restricted to, 

 140, 149, 199, 201 

 (See also Sap; Transpiration) 



