ISHS Acta Horticulturae 556: V International Congress on Hazelnut
CONCENTRATION OF INDIVIDUAL CYTOKININS IN NUTS OF CORYLUS AVELLANA L. AND THEIR RELATIONSHIP WITH BLANKS |
| Authors: | A.P. Silva, A. Santos, E. Rosa, A. Rodríguez |
| Keywords: | hazelnut, plant growth regulators, plant hormones, dihydrozeatin, zeatin, filbert, seedless, Portugal |
| Abstract:
Cytokinins are one type of plant hormone which have been recognized as being involved in cell division of plants during growth and development. Hazelnut yields are affected by the occurrence of blank nuts, a process in which hormones are likely to play a role. The objective of this study was to evaluate the individual cytokinin levels throughout the nut growth period in two hazelnut cultivars (‘Butler’ and ‘Merveille de Bollwiller’) which have different tendencies with regard to blank nut production. An immunoassay was used to quantify cytokinin content in nut tissues (shell, kernel and inner tissues) that were collected on three specific dates during nut growth. Cultivar had a significant effect on endogenous cytokinin levels. Dihydrozeatin (diH)Z was identified as the major cytokinin group, while zeatin (Z) was less prevalent. These results support the accepted pathway on the conversion of 6-(3-methyl-2-butenyl amino) purine (iP) into (diH)Z through the intermediate Z. No differences were noted between normal and blank nuts in either of the cultivars studied. | |
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