Abstract
Abstract Fruit setting factors of Pyrus communis L., ‘Tsakoniki’ pear, were observed under field and controlled environmental conditions during 1980—83. Pollen germination of ‘Tsakoniki’ and ‘Coscia’ was reduced at temperatures below 15°C whereas pollen tube growth rate in vitro and in vivo increased with temperatures between 5° and 25°C. Pollen tube growth in selfed styles of ‘Tsakoniki’ at all temperatures tested was slower than in crossed ones and pollen tubes reached the base only in 10% to 20% of the styles. Effective pollination period (EPP) was prolonged at low temperature and ranged between 3 and 13 days under various temperature treatments. Fruit set of ‘Tsakoniki’ was limited chiefly by pollen transfer and to a lesser extent by poor pollen tube growth at low temperature.
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