Population Dynamics of Open-pollinated Maize Synthetics under Non-random Fertilization Conditions
With the exception of natural populations in higher plants cross-pollinated crops, such as maize, sorghum, rye sugarbeet, buckwheat and rapeseed, have no complete homozygous genotypes in a population unless either artificial isolation from other genotypes or controlled pollination in applied. Through open-pollination, in contrast, every population appears to be able to preserve its heterozygosity to some extent. The theoretical genetic basis accounting for this phenomenon is related to the random mating population theory including the some premises (Falconer 1960). In the past decade, on the other hand, it has been pointed out that this ideal population could not actually be obtained in cross-pollinated crops (Hartl 1975, Harding 1975, Jain 1975, Clegg et al. 1978, Yamada 1982). In these reports it was emphasized, that either at the sporophyte or at the gametophyte stages random fertilization was not possible and that this fact could not be overlooked.
KeywordsMaize Sorghum Rium
Unable to display preview. Download preview PDF.
- Clegg MT, Xahler AL, Allard RW (1978) Estimation of life cycle components of selection in an experimental plant population. Genetics 09: 755–792Google Scholar
- Falconer DS (1958) Introduction to quantitative genetics. Oliver Boyd Ltd. London 9–22Google Scholar
- Harding J (1975) Models for gamete competition and self fertilization as components of natural selection in populations of higher plants. “Gamete competition in plants and animals” (ed. Mulcahy DL), North-Holland Pub. Amsterdam, 243–255Google Scholar
- Hartl DL (1975) Stochastic selection of gametes and zygotes. Ibid. 233–242Google Scholar
- Jain SK (1975) Gametic selection in mixing selfing and random mating plant populations. Ibid. 255–278Google Scholar
- Paterniani E, Stort AC (1974) Effective maize pollen dispersal in the field. Euphytica 129–134Google Scholar
- Yamada M (1982) Superiority of pollen from F1 plant in selective fertilization and its implication in maize breeding. Bull NIAS D33: 63–119 (in Japanese with English summary)Google Scholar
- Yamada M, Murakami X (1983) Superiority in gamete competition of pollen derived from F1 plant in maize, “Pollen: Biology and implication for plant breeding” (ed. Mulcahy DL, Ottaviano S) Elsevier Sci Pub 389–395Google Scholar
- Yamada M (1984) Selective fertilization in maize, Zea maysL. III Independence of gametophyte factors on superiority of pollen grains from F1 plants. Japan J Breed 34: 9–15Google Scholar