Abstract
Lee (1955) demonstrated that microscopic tumor initials occur in the phloem fiber tissues of young stems of sweet clover infected with wound-tumor virus and that most of these never develop so that they produce macroscopic growths. Alpha-naphaleneacetic acid (NAA) and certain other growth-regulating substances act synergistically with this virus to stimulate the growth of such tumor initials and also to initiate the formation of many additional ones. The augmentation of tumor growth can be observed histologically within 72 hours after the application of 2% NAA in lanolin to the apical nodes of infected plants. The resulting tumorous growth is intermingled with many abortive adventitious roots in contrast to tumors which develop naturally as a result of infection with wound-tumor virus and which contain no adventitious roots.
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