caa a22 4500 475794192 CHVBK 20180406123719.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1007/s001220051550 doi (NATIONALLICENCE)springer-10.1007/s001220051550 Fecundity and fitness in cross-compatible pollinations of tristylous North American Lythrum salicaria populations [Elektronische Daten] [N. O. Anderson, P. D. Ascher] Abstract : As heterostyly and self incompatibility are linked in tristylous L. salicaria, all cross-compatible pollinations - those between anthers and styles of the same level - should produce viable seed. The rigor of this theory was tested using seed set and germination of cross-compatible pollinations in 18 naturalized L. salicaria populations in Minnesota/Wisconsin (n=342 genotypes; n=86 shorts, n=127 mids, and n=129 longs). Seed set for short-styled genotypes ranged from zero to 135 (36+38); mids-0-156, (53+39), and longs-0-151 (59+39). Mean seed set per capsule was not significantly different for mids and longs, but both were significantly greater than that of shorts (F=14, P<0.0001). Zero seed set frequently occurred in most compatible crosses, in contrast with theoretical expectations. The high percentage of populations deviating from normality must be due to incompatibility. An incompatibility system independent of heterostyly could cause this, where failed crosses result from matches of incompatibility specificities in pollen and pistil. This independence is questionable, however, given the non-significant difference in failed outcrosses for pooled χ2 comparing within and between populations (χ2=0.395, P>0.5). A sporophytic incompatibility model is proposed with a minimum of three specificities. Zero seed set in compatible crosses is due to the addition of alleles from L. alatum, a distylous species that forms introgressive hybrids with L. salicaria. Reduced fecundity could increase the deficiency of shorts, and significantly greater seed germination of shorts could explain the continued presence of short-styled individuals in L. salicaria populations. Springer-Verlag Berlin Heidelberg, 2000 Key words Germination nationallicence Heterostyly nationallicence Lythrum nationallicence Seed set nationallicence Self Incompatibility nationallicence Anderson N. O. Department of Horticultural Science, University of Minnesota, 1970 Folwell Avenue, St. Paul, MN 55108, USA e-mail: anderø44@tc.amn.edu Fax: +1612/624-4941, US aut Ascher P. D. Department of Horticultural Science, University of Minnesota, 1970 Folwell Avenue, St. Paul, MN 55108, USA e-mail: anderø44@tc.amn.edu Fax: +1612/624-4941, US aut https://doi.org/10.1007/s001220051550 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s001220051550 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Anderson N. O. Department of Horticultural Science, University of Minnesota, 1970 Folwell Avenue, St. Paul, MN 55108, USA e-mail: anderø44@tc.amn.edu Fax: +1612/624-4941, US aut NATIONALLICENCE 700 1- Ascher P. D. Department of Horticultural Science, University of Minnesota, 1970 Folwell Avenue, St. Paul, MN 55108, USA e-mail: anderø44@tc.amn.edu Fax: +1612/624-4941, US aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer