Effect of 2,4-Dichlorophenoxyacetic Acid on Root Development in Bean Cotyledons

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Abstract
Roots were observed on cotyledons of garden beans (Phaseolus vulgaris var. lualualei) planted in 2,4-D -treated soil. This seems to be the first reported instance of this phenomenon. After the embryonic axis died and if the cotyledons survived the effects of the 2,4-D, the latter remained turgid and developed root primordia. Cotyledons from another var. of garden beans (Bountiful) from which the germ end had been severed to remove the embryonic axis entirely were planted in 2,4-D-treated and untreated soil. Those planted in the 2,4-D-treated soil developed roots, whereas those planted in the untreated soil showed no signs of root development. Excised cotyledons of beans (var. Bountiful) when placed in petri dishes containing 2,4-D solns. rooted at concns. ranging from 1 to 32 ppm. At room temp. and at daily alternating temps. (room temp. to 84.9 - 93.5), these cotyledons rooted most readily at 2 to 8 ppm. 2,4-D. At 84.9 - 93.5 F, they rooted most readily at 1 to 4 ppm.

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