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• W2132893991 abstract "Gravitropic perception and response are essential for the completion of the reproductive life cycle of the peanut plant (Arachis hypogaea L.). The developing seeds are buried in the soil by a specialized organ, the gynophore, allowing the fruit to mature underground. Controversy exists about the site of graviperception in the gynophore: previous workers suggested that the intercalary meristem was the zone where gravity was perceived. Taking the starch statolith hypothesis for graviperception as a framework, we explored the possibility that the starch-grain filled plastids (amyloplasts) in the starch sheath of the gynophore may be acting as gravisensors. We show that these amyloplasts sediment readily with respect to the gravity vector within 30 min of reorientation, and before there is a measurable gravitropic response. Gynophore explants were incubated with gibberellic acid and kinetin, in darkness, to remove starch from the amyloplasts. Destarching the gynophores did not inhibit overall growth of the organ, but reduced the gravitropic response curvature by 82% compared to water-treated controls. In addition, gynophores placed on a rotating clinostat (without hormone treatment) also showed a reduced gravitropic response. In conclusion, the evidence presented in this work strongly suggests that the amyloplasts of the starch sheath are responsible for gravitropic perception in the peanut gynophore. A model for graviperception in the gynophore is presented." @default.
• W2132893991 created "2016-06-24" @default.
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• W2132893991 date "1999-12-01" @default.
• W2132893991 modified "2023-09-23" @default.
• W2132893991 title "The Role of Amyloplasts during Gravity Perception in Gynophores of the Peanut Plant (Arachis hypogaea)" @default.
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• W2132893991 doi "https://doi.org/10.1006/anbo.1999.0963" @default.
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