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Development and Growth Regulation

Gibberellic Acid Regulates Cell Wall Extensibility in Wheat (Triticum aestivum L.) ¹

Department of Plant Breeding and Biometry, Cornell University, Ithaca, New York 14850

Mutations (Rht genes) blocking sensitivity to gibberellic acid (GA) were used to examine phytohormone mediated cell wall expansion in wheat (Triticum aestivum L.). Irreversible extensibility of immature leaf segments, as determined by stress/strain (instron) measurements, declined with Rht gene dose. Exogenous GA₃ significantly increased wall extensibility in the nonmutant controls but had no effect on the near-isogenic GA-insensitive genotypes. Furthermore, ancymidol, an inhibitor of gibberellin biosynthesis, diminished wall extensibility in the nonmutant control. Extensibility of immature segments was highly correlated with mature leaf sheath length (R = +0.95). The results indicate that wall yielding properties of expanding wheat leaves are associated with leaf cell expansion potential and that GA is involved in the determination of those properties.

³ Permanent address: Department of Agronomy, Cornell University, Ithaca, NY 14850.

¹ Supported by a grant from Monsanto Co., St. Louis, MO, and by Hatch project 419. Paper No. 775 in the Plant Breeding series.

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