Indoleacetic acid, abscisic acid and phenolic substances during development of hazel leaves |
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Authors: | Ana Rodríguez María Jesús Cañal Ricardo Sánchez Tamés |
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Institution: | Lab. de Fisiología Vegetal, Dpto de B.O.S., Facultad de Biologia, Univ. de Oviedo, E-33005 Oviedo, Spain. |
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Abstract: | The levels of indoleacetic acid (IAA), abscisic acid (ABA) and phenolic substances were measured monthly in leaves of hazel ( Corylus avellana L. cv. Negreta) in different stages of development from April till abscission in November. IAA and ABA were quantified by flame ionization detector gas-chromatography (GLC), and the total phenolic content by a colorimetric technique. During spring, IAA levels were the highest, coinciding with the greatest expansion of the leaves; after which IAA gradually decreased as the leaves became older, although minor increases were observed in July-August and November. The ABA level in hazel leaves was low throughout the period of leaf existence, with a maximum in July and a second increase in November, coinciding with the last month in which hazel bears leaves. The phenols of the neutral fraction showed a minimum in May and a pronounced increase in June, remaining at this level during summer and decreasing in November. The acid and alkaline fractions showed a maximum in August, which could be related to the decrease in the growth rate of leaves. The residual fraction remained at a relatively low level until September, increasing rapidly in October and November. |
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Keywords: | Abscisic acid Corylus avellana hazel indoleacetic acid leaves phenols |
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