624 GROWTH CORRELATIONS 



2. Why is it recommended that flowers be removed from Azaleas as soon as they 



have faded in order to insure abundant flowering the next year? Why is 

 this practice more important in this species than in some others? 



3. When the terminal meristem of many herbaceous plants (examples: many 



mints and asters) differentiates into an inflorescence development of lateral 

 buds, previously dormant, often begins. What are some possible explana- 

 tions? 



4. Cotton plants continue to bloom throughout the summer yet few of the later 



flowers give rise to cotton bolls. Explain. 



5. Commercial growers sometimes remove many of the young fruits from peach 



trees. This reduces the number of fruits in the resulting harvest yet may 

 prove more profitable. Explain. 



6. How can the development of differences of electrical potential in plant tissues 



be accounted for? 



Suggested for Collateral Reading 



Went, F. W., and K. V. Thimann. P/iytohormones. Macmillan Co. 

 New York. 1937. 



Selected Bibliography 



Clark, W. C. Polar transport of auxin and electrical polarity in coleoptile 



0/ Avena. Plant Physiol. 12: 737-754. 1937- 

 Harris, F. S. The effect of soil moisture, plant food, and age on the ratio 



of tops to roots in plants. Jour. Amer. Soc. Agron. 6: 65-75. 19I4- 

 Lund, E. J. Electric correlation bctiueen living cells in cortex and wood in 



the Douglas fir. Plant Physiol. 6; 631-652. 1931. 

 Murneek, A. E. Correlation and cyclic growth in plants. Bot. Gaz. 79: 



329-333. 1925. 

 Pearsall, W. H. Studies in growth. IF. Correlations in development. Ann. 



Bot. 37: 261-275. 1923. 

 Rosene, H. F. Proof of the principle of summation of cell E.M.F.'s. Plant 



Physiol. 10: 209-224. 1935. 

 Skoog, F., and K. V. Thimann. Further experiments on the inhibition of the 



development of lateral buds by growth hormone. Proc. Nat. Acad. Sci. 



(U.S.A.) 20: 480-485. 1934. 

 Snow, R. On the nature of correlative inhibition. New Phytol. 36: 283-300. 



1937. 



Turner, T. W. Studies of the mechanism of the physiological effects of cer- 

 tain mijieral salts in altering the ratio of top groivth to root growth in 

 seed plants. Amer. Jour. Bot. 9: 415-445. 1922. 



Went, F. W. Specific factors other than auxin affecting growth and root 

 formation. Plant Physiol. 13: 55-80. 1938. 



