Excerpt from Growth Hormones in Plants: Authorized English Translation of Die Wuchsstofftheorie Und Ihre Bedeutung Für Die Analyse Des Wachstums Und Der Wachstumsbewegungen Der Pflanzen

Plant growth hormones have been recognized by many investi gators as Offering fruitful opportunities for study, and there is ample evidence in the-contributions Of the past year or two that research ih this field is progressing at a rapid pace. One dis covers in the literature that growth hormones promote cell enlargement in shoots of higher plants, initiate the development Of roots (but at the same time inhibit their growth in length), inhibit the development Of lateral buds, stimulate cell division in the cambium, and bring about callus formation. Such diverse effects are Of great interest, but in many instances more evidence must be Obtained to prove the theoretical Views which we now possess. Professor Boysen Jensen's review Of the subject makes clear numerous weaknesses and gaps in our knowledge and thus helps point the way for future research.

The arrangement of certain chapters has been modified in the translation SO that students not already acquainted with the literature may become familiar with techniques and general methods Of procedure. Certain parts Of the book have been condensed slightly, while others have been expanded to include data from the approximately 200 new citations added to the bibliography. The essential features of the controversial final chapter Of the German edition have been included so far as possible in earlier chapters. In an attempt to make the American edition as useful as possible to students, we have added an index.

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