The performance of double or mixed pollinations with compatible and self-incompatible or incongruous pollen of pear and apple |
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| Authors: | T Visser Clara M Marcucci |
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| Institution: | (1) Institute for Horticultural Plant Breeding (IVT), Wageningen, the Netherlands;(2) Istituto Coltivazione Arboree, Università di Bologna, Italy |
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| Abstract: | Summary Six pear and five apple trials were carried out to ascertain the outcome of combinations of compatible pollen (C) with self (S) or incongruous pollen (I) as to the pollination index (PI=seeds/pollinated flower). The PI of the mixture C+I (1:5) was consistently depressed as compared to that of the control C. The results of the double pollinations S/C and I/C were affected by the temperature at pollination; their PI's at <15°C were twice as high as those at >15°C, being well above and below the PI of C in the former and latter case respectively. The opposite was true for the C/S combination, the PI of which increased with the pollination temperature; the PI of C/I did not differ much from the PI of C, irrespective of temperature. The conclusion was reached that the interaction previously and presently found between compatible and self-incompatible pollen also exists to a fair extent between compatible and incongruous pollen. However, in pear neither the mentor nor the pioneer pollen technique proved to aid its hybridization with apple, the formation of self seed was not observed either. In apple the production of apple × pear hybrids was likewise doubtful, but the double pollinations S/C and C/S formed 4–10% self seed. |
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| Keywords: | Pyrus pear Malus apple pollination interaction compatible self-incompatible incongruous pollen |
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