. Auxins and plant growth. Auxin; Plant growth promoting substances. Dormancy and Storage 269 esterified auxin at rates such that approximately one gram of auxin is applied per bushel of potatoes. Smith et al (1947) have more re- cently found that auxins applied to the foliage of the plants before harvest will reduce sprouting of root and tuber crops. The methyl ester of naphthaleneacetic acid appears to be effective in this tech- nique. Recent reports indicate that maleic hydrazide can also effectively be used on potatoes, especially as a foliar spray before harvest. The effects of varying co
. Auxins and plant growth. Auxin; Plant growth promoting substances. Dormancy and Storage 269 esterified auxin at rates such that approximately one gram of auxin is applied per bushel of potatoes. Smith et al (1947) have more re- cently found that auxins applied to the foliage of the plants before harvest will reduce sprouting of root and tuber crops. The methyl ester of naphthaleneacetic acid appears to be effective in this tech- nique. Recent reports indicate that maleic hydrazide can also effectively be used on potatoes, especially as a foliar spray before harvest. The effects of varying concentrations of maleic hydrazide have been re- ported by Paterson et al (1952) as shown in figure 112. It is rather interesting to note that maleic hydrazide, which antagonizes auxin, is more effective in prolonging dormancy at lower temperatures whereas the naphthaleneacetate ester, an auxin, may be less effective at lower temperatures (cf. figures 109 and 112). Prolonging dormancy in carrots has been done successfully with the methyl ester of naphthaleneacetic acid dusted onto the roots in storage (Dallyn and Smith, 1952) or by spraying auxins or maleic hydrazide on the foliage before harvest (Wittwer and Sharma, 1950). The effective treatment of onions is made more difficult by the protected position of the growing point inside the onion bulb; con-. 0 500 1000 2500 MG/L CONC. OF MALEIC HYDRAZIDE Fig. 112. Effects o£ foliar sprays of maleic hydrazide on sprouting of potatoes in subsequent storage at two temperatures (Paterson et al, 1952).. 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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