I 9-°J 



WALSTER BARLEY 



I 2 I 



TABLE XIII 



Effect of temperature upon amount of cell wall material, 

 etc. Fj— [(N in F 3 X 6. 25) + (starch in F 3 )|; expressed 



AS PERCENTAGE OF TOTAL DRY WEIGHT OF LEAF 



Culture no. and treatment 



Ratio of supporting 

 tissue (cell walls, 

 etc.) to all other 

 plant substances, 

 including water 



44. High N warm 



24. High N .warm 



41. High P and N warm. 



Average warm 



108. High N cool 



87. High N cool 



104. High P and N cool. . . 

 Average cool 



0.0470 

 0.0525 

 0.0367 

 0.0454 



OOS39 

 0.0581 

 0.0558 

 00559 



, TABLE XIV 



Effect of temperature on distribution of phosphorus; summary table 



Material 



NO. 24, HIGH N, WARM 



Percentage 

 total leaf 



Lipoid P, Ft 



Phosphate P, F 2 



Organic P, F 2 



Phosphoprotein P, F 3 



Nucleoprotein P, F 3 .. 



Total P 



0.0530 

 o. 2105 

 0.0665 

 o. 141 1 

 o. 2067 



0.6787 



Percentage 

 total P 



No. 87, high N, COOL 



Percentage 

 total leaf 



0.0627 

 0.0714 

 0.0703 



0.0832 



0.2833 

 0.5709 



Percentage 

 total P ' 



I0.99 

 I2.8o 

 12.31 

 18.38 

 49.62 



Results of chemical analysis 



Lipin fraction (F x ). — The results given in table V indicate 

 that the temperature has very little effect upon the amount of 

 lipins, except in the case of a high phosphorus supply, where the 

 percentage of lipins is decidedly higher. This fact is possibly 

 correlated with the higher percentage of phospho-lipin phosphorus 

 in the entire leaf, as shown in the third column of table X, and the 

 higher percentage of lipin N as shown in the third column of table 

 IX. Since the proportion of lipin P is practically the same for 

 both temperatures in the case of the high nitrogen series, these 

 data lead to the conclusion that the lipin fraction is not an impor- 

 tant growth determinant. The writer recognizes the desirability 

 of more data. 



