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GROWTH SUBSTANCES IN FRUIT SETTING AND DEVELOP.MFNT1.2 By JULIAN C. CRANE3 Department of Pomology, University of California, Davis, California Nitsch (112), in his review of this subject in 1953, pointed out that fruit setting and growth were obviously under a control mechanism and presented the evidence for auxin originating in the seed as being the key factor involved. In summarizing the advancement of knowledge in this field for the interven ing period, Leopold (74), in 1958, concluded that "fruit setting by growth regulators is a function of their auxin activity." However, since auxin had been found to be effective in setting only a limited number of fruits, he sug gested that in general an additional factor might be required, a growth stimu lant of the type Steward & Simmonds (150) isolated from parthenocarpic banana fruits. Since 1958, knowledge concerning naturally occurring growth substances has advanced rapidly and much pertinent material has appeared in many reviews (4, 48, 70, 135). Currently, two general classes of substances that stimulate growth are recognized in addition to the auxins; the gibberellins (124) and (16, 75, 91, 92, 102, 124, 151, 156, 164) and in several books the kinins (102). In addition, there
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1964
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