In this article:
Phaseic acid appears to act as a specific inhibitor of photosynthesis in vivo.
Such inhibition is probably associated with the ‘after-effects’ of moisture stress and with other forms of non-stomatal influences on photosynthesis that follow manipulative treatments (leaf excision, fruit removal).
This naturally occurring inhibitor was extracted from leaves of Vitis vinifera L. and applied to a variety of material(including vine foliage) under laboratory conditions.
Internal Control of Stomatal Physiology and Photosynthesis. II. Photosynthetic Responses to Phaseic Acid
1975, Australian Journal of Plant Physiology, vol 2, pages 553-567
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