. Auxins and plant growth. Auxin; Plant growth promoting substances. 44 Fundamentals of Auxin Action \'alentine beans are recommended as the most sensitive variety and red kidney beans as a somewhat less sensitive alternative. Application Solutions to be tested are made up in 95% ethyl alcohol containing 1% Tween 20 or other detergent. Pipette ml. of each solution on each of 10 to 20 expanding trifoliate leaves. Reading After 5 to 13 days remove the expanded trifoliate leaves and compare on either a weight or leaf area basis. This leaf repression method is an effective test for sohitions
. Auxins and plant growth. Auxin; Plant growth promoting substances. 44 Fundamentals of Auxin Action \'alentine beans are recommended as the most sensitive variety and red kidney beans as a somewhat less sensitive alternative. Application Solutions to be tested are made up in 95% ethyl alcohol containing 1% Tween 20 or other detergent. Pipette ml. of each solution on each of 10 to 20 expanding trifoliate leaves. Reading After 5 to 13 days remove the expanded trifoliate leaves and compare on either a weight or leaf area basis. This leaf repression method is an effective test for sohitions of 2,4-D ranging from 1 to 100 Each plant receives from to micrograms of auxin. Comparisons of leaf area give results with slightly greater sensitivity than comparisons of weight differences; 1007c 80 60 40 o X z LEAF AREA. / AMOUNT OF 2,40 PER PLANT 025 UG Fig. 22. Results of a leaf repression test showing the semi-logarithmic inhibition of leaf area and leaf weight at varying conceatrations of auxin, 2,4-dichlorophe- noxyacetic acid (Brown and Weintraub, 1950).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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