biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 55:237-242, 2011 | DOI: 10.1007/s10535-011-0034-6

Effects of leaf soluble sugars content and net photosynthetic rate of quince donor shoots on subsequent morphogenesis in leaf explants

M. Mingozzi1,4,*, S. Morini1, M. Lucchesini2, A. Mensuali-Sodi3
1 Dipartimento di Coltivazione e Difesa delle Specie Legnose "G. Scaramuzzi", Sezione di Coltivazioni Arboree, Università di Pisa, Pisa, Italy
2 Dipartimento di Biologia delle Piante Agrarie, Università di Pisa, Pisa, Italy
3 Scuola Superiore Sant'Anna di Studi Universitari e Perfezionamento, Pisa, Italy
4 Dipartimento di Produzione Vegetale, Università di Milano, Milano, Italy

The effects of different growth conditions (ventilated and closed vessels, medium with 0, 15 and 30 g dm-3 sucrose) during proliferation of donor quince (Cydonia oblonga Mill.) shoots (stage I) on net photosynthetic rate and soluble sugars content were evaluated. In order to assess the influence of these physiological parameters on morphogenesis, leaf explants harvested from donor shoots were induced to form somatic embryos and adventitious roots under ventilated and closed Petri dishes (stage II). Natural ventilation and low sucrose contents (0-15 g dm-3) promoted the photosynthetic rate of quince shoots whereas biomass accumulation was the highest in those shoots cultured with 30 g dm-3 sucrose in both vessel types and 15 g dm-3 sucrose under natural ventilation. Increasing sucrose content in the medium induced greater accumulation of sucrose in leaf tissues of donor shoots. The content of reducing sugars was higher than that of sucrose, and it appeared to be higher in shoots cultured under natural ventilation compared to those in closed vessels. Somatic embryogenesis and root regeneration were influenced by stage I and II treatments. A significant correlation between sucrose content in the leaves of donor shoots and the number of somatic embryos regenerated was found, suggesting that identification of biochemical and physiological characteristics of donor shoots associated with increased regeneration ability might be helpful for improving morphogenesis in plant tissue culture.

Keywords: adventitious roots; Cydonia oblonga; reducing sugars; somatic embryos; sucrose; ventilated vessels

Received: July 23, 2009; Accepted: June 10, 2010; Published: June 1, 2011  Show citation

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Mingozzi, M., Morini, S., Lucchesini, M., & Mensuali-Sodi, A. (2011). Effects of leaf soluble sugars content and net photosynthetic rate of quince donor shoots on subsequent morphogenesis in leaf explants. Biologia plantarum, 55(2), 237-242. doi: 10.1007/s10535-011-0034-6
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