The Relationship between Growth and Proline Incorporation after Auxin Treatment of Mung Bean Hypocotyls

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Abstract
Indoleacetic acid (IAA) stimulates the incorporation of 14C‐proline into both the cyloplasmic and the cell wall fractions of the hypocotyl of mung bean (Phaseolus aureus Roxb. cv. Black). It neither stimulates the transfer of 14C‐proline from the cyloplasmic fraction into the cell wall fraction, nor the retention of 14C‐proline in the wall or cytoplasmic fractions. Moreover, the stimulation of growth caused by IAA parallels the stimulation of the incorporation of proline into the cytoplasmic fraction, but does not parallel the stimulation into the cell wall fractions.The stimulation of the incorporation into the cyloplasmic fraction seems to appear within 30 minutes after auxin treatment, at about the same time the increase in the growth is observed in response to IAA, suggesting a connection between these effects. On the other hand, the stimulation of the proline incorporation into the cell wall fraction seems to require more than 90 minutes after auxin treatment, suggesting no close connection between growth and proline incorporation into the cell wall fraction.