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paclobutrazol
Paclobutrazol (PBZ) is a plant growth retardant and triazole fungicide. It is a known antagonist of the plant hormone gibberellin. It acts by inhibiting gibberellin biosynthesis, reducing internodial growth to give stouter stems, increasing root growth, causing early fruitset and increasing seedset in plants such as tomato and pepper. PBZ has also been shown to reduce frost sensitivity in plants.
PBZ is used by arborists to reduce shoot growth and has been shown to have additional positive effects on trees and shrubs. Among those are improved resistance to drought stress, darker green leaves, higher resistance against fungi and bacteria, and enhanced development of roots.〔Chaney ''et al.'' 1996〕〔Fletcher ''et al.'' 2000〕〔Rademacher 2000〕〔Chaney 2003〕 Cambial growth, as well as shoot growth, has been shown to be reduced in some tree species.〔Bai ''et al.'' 2004〕
== Application methods ==
PBZ is normally applied to the soil to be taken up by the roots and transported via the xylem to the upper parts of the plant. Foliar application is mostly ineffective.〔 Seeds can be soaked with PBZ to reduce seedling growth.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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