Occurrence of 4-Cl-Indoleacetic Acid in Broad Beans and Correlation of Its Levels with Seed Development

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Abstract
Seeds and leaves of V. faba L. contain considerable amounts of 4-Cl-IAA as determined by GLC and GLC-mass spectrometry. The unchlorinated auxin could not be detected in either leaves or seeds at different stages of development. The developmental stages of fruits and seeds were characterized by the rate of straight growth of pods, the rate of fresh weight increase, and the development of the endosperm. The peak of 4-Cl-IAA content per seed coincides with the maximum rate of water accumulation in the seeds.