Plant Growth Effects of Heteroauxin Applied to Soil and Plants

The Growth Effects of Thiamin Chloride, Ascorbic Acid and Phytohormones on Belladonna and Ricinus**Presented before the Scientific Section, A. Ph. A., Richmond meeting, 1940.

“…5 , 9, 10). It has been demonstrated by Loehwing and Baugess (17) that the application of heteroauxin nutrient solutions directly to the soil result in stimulation of early growth. Other hormone substances, likewise, have been applied to the soil (14) and found to induce all of the responses obtained by applying the material to the aerial parts of plants in the form of a lanolin paste.…”

“…Chem. Soc., Data of considerable value are rapidly accumulating from currently widespread experimentation as to the effects of phytohormones; vitamins and related organic stimulants upon seed germination and general growth of plants (1,5,7,8,13,15,17,18,20). Most such experiments have dealt with the effects of a single stimulant upon crop plants.…”

INFLUENCE OF AUXINS ON REPRODUCTION OF LEMNA MAJOR

“…THIMANN anid LANE (13) have showni that in Avena and Triticum the additioni of auxin increased the dry weight, accelerated vegetative growth, and slightly hastened flowering. LOEIIWING anld BAUG-UESS (9) applied heteroauxin to the soil as well as to the planits anid produced variation in growth.…”

Production of Growth Substance by Bacteria in Media Containing Specific Organic and Inorganic Nitrogenous Compounds

“…It seems clear both from earlier work and in the light of the present report that microorganisms in nature are continually converting organic substrate, in some small part at least, to special substances capable of exerting regulatory action in the growth of higher plants. Certain members of this general class of growth substances, under appropriate circumstances, are known to be capable of penetrating the roots of green plants grown in soil (Hitchcock and Zimmerman, 1935;Loehwing and Bauguess, 1936;Greenfield, 1937). It has been found that these substances, which enter and move about in plants, stimulate growth of the plant body and evoke many other remarkable responses.…”