Medical Definition of Plant growth substances

1. Substances that, at low concentration, influence plant growth and differentiation. Formerly referred to as plant hormones or phytohormones, these terms are now suspect because some aspects of the hormone concept, notably action at a distance from the site of synthesis, do not necessarily apply in plants. Also called plant growth regulators. The major classes are absicisic acid, auxin, cytokinin, ethylene and gibberellin, others include steroid and phenol derivatives. (31 Dec 1997)



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Lexicographical Neighbors of Plant Growth Substances

plant closing
plant community
plant components
plant department
plant dermatitis
plant disease
plant epidermis
plant families and groups
plant family
plant fiber
plant fibre
plant food
plant genus
plant growth regulators
plant growth substances (current term)
plant hopper
plant hormone
plant hormones
plant indican
plant kingdom
plant leaves
plant life
plant louse
plant material
plant oils
plant order
plant organ
plant out
plant part

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