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» Articles » PMID: 24477310

Diffusible Gibberellins and Phototropism in Helianthus Annuus

Overview
Journal Planta
Specialty Biology
Date 2014 Jan 31
PMID 24477310
Citations 4
Authors
I D Phillips
Affiliations
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Abstract

Endogenous gibberellins were obtained in agar from the lower cut surface of upright sunflower shoot-tips. Exposure to unilateral light of the tips standing on agar, with the lower cut ends bisected by a vertical glass barrier at right angles to incident light, resulted in approximately 8 times the quantity of gibberellins moving into the agar below the shaded side than into the agar below the illuminated side. These results are similar to those reported earlier for gibberellins and geotropism in sunflower shoots, and suggest than the development of both light-and gravity-induced growth curvatures involve an asymmetry in gibberellin distribution across elongating internodes.

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Phillips I . Endogenous gibberellin transport and biosynthesis in relation to geotropic induction of excised sunflower shoot-tips. Planta. 2014; 105(3):234-44. DOI: 10.1007/BF00385395. View
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Phillips I . Maintenance of gibberellin biosynthesis in excised sunflower apical buds by exogenous sucrose or mevalonate. Planta. 2014; 101(3):277-82. DOI: 10.1007/BF00386834. View