ISHS Acta Horticulturae 769: XXVII International Horticultural Congress - IHC2006: International Symposium on Asian Plants with Unique Horticultural Potential
SEASONAL CHANGES IN FRUIT GROWTH AND DEVELOPMENT OF SOME ASIAN PEAR (PYRUS SEROTINA REHD.) GENOTYPES UNDER TEHRAN ENVIRONMENTAL CONDITIONS |
| Authors: | K. Arzani, B. Kashefi, M.A. Nejatian |
| Keywords: | Asian pear, Pyrus serotina (Rehd.), fruit growth and development, mathematical model, days after full bloom (DAFB) |
| Abstract:
Growth in plants defined as irreversible increase in volume and size. These changes are different based on stage of growth and physiological activity of fruit trees. This research was conducted in order to determine the period of fruit growth and development and build up a mathematical model between fruit diameter, volume and fruit fresh and dry weight. Two experiments were carried out using four mid- (KS13, KS14) and late season (KS8, KS12) maturing fruits of Asian pear (Pyrus serotina Rehd.) genotypes grown in Research Orchard, Department of Horticultural Science at Tarbiat Modares University (TMU), Iran. In the first experiment, 24 fruits from middle canopy zone of experimental trees were tagged and fruit diameter was measured in time interval until fruit harvest. In the second experiment, 3-5 fruits were harvested from each genotype. These fruits were randomly sampled at 15 d intervals from 35 d after full bloom until fruit harvest (ripening time). Fruit diameter, length, volume, fresh weight and dry weight were measured. Results indicated that simple and complete fruit sigmoid curves existed for all four genotypes even though the period of each phase of fruit growth was different in studied genotypes. So, slow growth phase of the curves for mid season genotypes was between 120-180 d after full bloom (DAFB) and 150-200 DAFB for late season maturing fruit genotypes. In addition, mathematical models were presented based on the correlations between fruit diameter, volume and weight. These models are important and used for orchard management systems such as irrigation, fertilizer application, and estimation of fruit harvest and yield. | |
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