The role of phytohormones in the growth and development of plants is as fundamental as that of much better known biological systems, such as the citric acid or Krebs cycle, for which precise reactions are well known and demonstrated, while those for most plant hormones are still not clear. Most evidence indicates that generally more than one hormone is involved in those physiological responses attributed to hormonal influence, and the effects observed are due more to the hormonal balance than to the activity of any one hormone. On the other hand, sensitivity to growth substances may be the controlling factor rather than the hormone level itself (Trewavas, 1992).
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Pamela M. Ludford (2003) studied this question.
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