Physiology and genetics of self-incompatibility in Echinopsis chamaecereus (Cactaceae) |
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| Authors: | T H Boyle Alexander Idnurm |
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| Institution: | (1) Department of Plant and Soil Sciences, French Hall, University of Massachusetts, Amherst, MA 01003, USA e-mail: tboyle@pssci.umass.edu, US;(2) School of Botany, The University of Melbourne, Parkville, Victoria 3010, Australia, AU |
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| Abstract: | The self-incompatibility (SI) system of a geophytic cactus (Echinopsis chamaecereus Friedrich & G. Rowley) was examined in a series of experiments. Pollination tests indicated that E. chamaecereus is an obligate outbreeding species with a functional SI system. Incompatible matings were characterized by stylar inhibition
of pollen tube growth and lack of fruit set. Two S1 seedlings were recovered when plants of one clone were exposed to 42°C for 16 h and flowers were selfed immediately after
incubation. The two S1 seedlings and the parental (S0) clone were crossed in a full diallel. Results were consistent with a one-locus, gametophytic SI system with two different
S alleles. Disturbed segregation at isozyme locus Lap-1 was attributed to close linkage with the S locus (recombination frequency = 11±8%). This is the second report of close linkage between Lap-1 and S in the Cactaceae.
Recevied: 1 February 2001 / Revision accepted: 13 March 2001 |
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| Keywords: | Echinopsis chamaecereus Fruit set Isozymes Pollen Seed set Self-incompatibility |
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