TEMPERATURE EFFECTS UPON THE GROWTH OF EXCISED ROOT TIPS

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Abstract
Excised root tips of dent corn, cotton, sunflower and Burpee''s Extra Early Pea were grown in a sterile modified Pfeffer''s soln. containing dextrose and peptone at 10, 15, 20, 25, and 30[degree] C, respectively, for periods of 14 days. Data on 25 root tips of each sp. indicate that the optimal temp. for excised pea roots was 10[degree] C, for sunflower and corn roots 20[degree] C, and for cotton roots 25[degree] C. Few or no lateral roots developed at 10[degree] and 35[degree] C. Temps. of 25[degree] and 30[degree] C inhibited formation of anthocyanin in corn roots; pigmentation in cotton roots was retarded at 10[degree] and 15[degree] C. Marked distension in diam. occurred in roots of pea at 10[degree] and 259 C and in corn and sunflower roots at 35[degree].

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