ISSN:
1573-5060
Keywords:
Malus
;
apple
;
Pyrus
;
pear
;
self-pollination
;
cross pollination
;
self-incompatibility
;
mentor pollen
;
pioneer pollen
;
fruit set
;
seed set
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary In compatible pollen combinations, viable but infertile irradiated pollen Cr appears to compete much more in a mixture (the mentor pollen situation: C+Cr), than when used one day in advance (the pioneer pollen situation: Cr/C). Seed set of Cr/C was usually also greatly superior to that of C/Cr and, using, self, incompatible pollen S instead of Cr, S/C was nearly always much better than C/S. This is in accordance with the promotion of the second by the first (pioneer) pollen. Hence, when Cr or S are applied second in C/Cr or C/S, more ovules are rendered ineffective (blocked or aborted) than in the reverse combination when Cr or S act as pioneer pollen. These observations are consistent with the trend that the combinations C/ C+S, C+S, C/S tended to produce more selfed seeds in that order. Although mentor or pioneer pollen assist in removing the style barrier for self pollen, embryo abortions appears to be a second obstruction towards seed formation. Indications are that high spring temperature during pollination promote the production of selfed seeds in the presence of compatible pollen. The surfeit of self pollen in orchards with a minority of pollinators is not necessarily an unfavourable factor, it may both directly and indirectly contribute to fruit and seed set.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00036864
Permalink
