Abstract
Meiotic behaviour in PMC's and in ESMC's, the development of pollen and embryo sacs, and the chromosome constitution of endosperm in this species (species E) define its unique genetic system. It is not a normal diploid, and is perhaps best defined as a quasidiploid. — The somatic complement consists of a diploid set of four chromosomes plus a haploid set of two nonhomologous chromosomes. The latter are inherited solely via the pollen. — In meiosis in both PMC'c and ESMC's the two univalents divide at the first division and lag at second anaphase. Pollen grains which do not receive them are non-functional. The embryo sacs are of the normal Asteroid type, and each is derived from a chalazal megaspore. They do not transmit the univalent chromosomes. Following fusion of the polar nuclei and double fertilisation, the endosperm has a constitution of 14 chromosomes. — The system parallels the maternal inheritance of univalents in Rosa canina and in Leucopogon juniperinus, except that the univalents do not constitute a full haploid set, and except that their transmission is paternal.
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Davis, G. L.: Embryological studies in the Compositae. 4. Sporogenesis, gametogenesis and embryogeny in Brachycome ciliaris. Aust. J. Bot. 12, 142–151 (1964)
Davis, G. L.: Systematic embryology of the Angiosperms. New York: John Wiley & Sons 1966
Hurst, C. C.: Embryo sac formation in diploid and polyploid species of Roseae. Proc. roy. Soc. Lond. B 109, 126–128 (1931)
Maheshwari, R.: An introduction to the embryology of angiosperms. New York: McGraw-Hill 1950
Renner, O.: Heterogamie im weiblichen Geschlecht und Embryosackentwicklung bei den Oenotheren. Z. Bot. 13, 609–621 (1921)
Renner, O.: Untersuchungen über die faktorielle Konstitution einiger komplex — heterozygotischer Oenotheren. Bibliotheca genet. 9, 1–168 (1925)
Smith-White, S.: Polarised segregation in the pollen mother cells of a stable triploid. Heredity 2, 119–129 (1948)
Smith-White, S.: The life history and genetic system of Leucopogon juniperinus. Heredity 9, 79–91 (1955)
Smith-White, S.: Pollen development patterns in the Epaoridaceae. A problem in cytoplasm-nucleus interaction. Proc. Linn. Soc. N.S.W. 84, 8–35 (1959)
Smith-White, S., Carter, C. R.: The cytology of Brachycome lineariloba. 2. The chromosome species and their relationships. Chromosoma (Berl.) 30, 129–153 (1970)
Tanaka, R., Terasaka, O.: Absence of the nucleolar constriction in the division of the generative nucleus of Haplopappus gracilis. Chromosoma (Berl.) 37, 95–100 (1972)
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Visiting A.R.G.C. Fellow, School of Biological Sciences, University of Sydney 1972.
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Carter, C.R., Smith-White, S. & Kyhos, D.W. The cytology of Brachycome lineariloba . Chromosoma 44, 439–456 (1974). https://doi.org/10.1007/BF00284903
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DOI: https://doi.org/10.1007/BF00284903