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Mutations, apical cells, and vegetative reproduction
Published online by Cambridge University Press: 05 December 2011
Synopsis
The fixation or loss of somatic mutations is considered in terms of apical initials and apical meristem organisation. Two general kinds of apical meristems are mathematically modelled: structured and stochastic. Structured apices have permanent apical initials whereas stochastic apices are more dynamic systems with apical initials randomly selected from an apical cell pool. With regard to neutral or completely recessive mutations, the probabilities of fixation or loss of mutations are identical for both structured and stochastic apices. For mutations which have a disadvantageous effect in heterozygous cells, diplontic selection occurs. In such cases, stochastic apices are purged of mutations more effectively than structured apices.
The majority of ferns have highly structured apices based upon single apical cells. Since such apices are the least able to be purged of disadvantages mutations, mutational load may be a significant aspect of the biology of these plants. Ferns that exhibit primarily asexual reproduction (either apogamy or vegetative reproduction) may also exhibit strong linkage disequilibrium between loci due to mutation.
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- Copyright © Royal Society of Edinburgh 1985
References
Bierhorst, D. W. 1977. On the stem apex, leaf initiation and early ontogeny in Filicalean ferns. Am. J. Bot. 64, 125–152.CrossRefGoogle Scholar
Cousens, M. I. 1979. Gametophyte ontogeny, sex expression, and genetic load as measures of population divergence in Blechnum spicant. Am. J. Bot. 66, 116–132.Google Scholar
Ganders, F. R. 1972. Heterozygosity for recessive lethals in homosporous fern populations: Thelypteris palustris and Onoclea sensibilis. Bot. J. Linn. Soc. 65, 211–221.Google Scholar
Holbrook-Walker, S. and Lloyd, R. M. 1973. Reproductive biology and gametophyte morphology of the Hawaiian fern genus Sadleria (Blechnaceae) relative to habitat diversity and propensity for colonization. Bot. J. Linn. Soc. 67, 157–174.Google Scholar
Klekowski, E. J. Jr., 1972. Evidence against genetic self-incompatibility in the homosporous fern Pteridium aquilinum. Evolution 26, 66–73.Google Scholar
Klekowski, E. J. Jr., 1973. Genetic load in Osmunda regalis populations. Am. J. Bot. 60, 146–154.Google Scholar
Klekowski, E. J. Jr., 1984. Mutational load in clonal plants: A study of two fern species. Evolution 38, 417–426.Google Scholar
Klekowski, E. J. Jr. and Kazarinova-Fukshansky, N. 1984a. Shoot apical meristems and mutation: Fixation of selectively neutral cell genotypes. Am. J. Bot. 71, 22–27.Google Scholar
Klekowski, E. J. Jr. and Kazarinova-Fukshansky, N. 1984b. Shoot apical meristems and mutation: Selective loss of disadvantageous cell genotypes. Am. J. Bot. 71, 28–34.Google Scholar
Levin, D. A. and Crepit, W. L. 1973. Genetic variation in Lycopodium lucidulum: a phylogenetic relic. Evolution 27, 622–632.Google Scholar
Lloyd, R. M. 1974a. Reproductive biology and evolution in the Pteridophyta. Ann. Mo. Bot. Gdn 61, 318–331.Google Scholar
Lloyd, R. M. 1974b. Mating systems and genetic load in pioneer and non-pioneer Hawaiian Pteridophyta. Bot. J. Linn. Soc. 69, 23–35.Google Scholar
Masuyama, S. 1979. Reproductive biology of the fern Phegopteris decursive-pinnata. I. The dissimilar mating systems of diploids and tetraploids. Bot. Mag., Tokyo 92, 275–289.Google Scholar
Newman, I. W. 1965. Pattern in the meristems of vascular plants. II. Pursuing the pattern in the apical meristems where no cell is a permanent line. Bot. J. Linn. Soc. 59, 185–214.Google Scholar
Popham, R. A. 1951. Principal types of vegetative shoot apex organization in vascular plants. Ohio J. Sci. 51, 249–270.Google Scholar
Relichová, J. 1977. Distribution of mutations in the apical meristem of the shoot in Arabidopsis thaliana (L.) Heynh. Folia 18, 5–109.Google Scholar
Schneller, J. J. 1979. Biosystematic investigations on the lady fern (Athyrium filix-femina). Pl Syst. Evol. 132, 255–277.CrossRefGoogle Scholar
Simmons, M. J. and Crow, J. F. 1977. Mutations affecting fitness in Drosophila populations. A. Rev. Genet. 11, 49–78.Google Scholar
Soma, K. and Ball, E. 1964. Studies on the surface growth of the shoot apex of Lupinus albus. Brookhaven Symp. Biol. 16, 13–45.Google Scholar
Stewart, R. N. 1978. Ontogeny of the primary body in chimeral forms of higher plants. In The Clonal Basis of Development, pp. 131–160. Englewood Cliffs, New Jersey: Prentice-Hall.Google Scholar
Stewart, R. N. and Dermen, H. 1970. Determination of number and mitotic activity of shoot apical initial cells by analysis of mericlinal chimeras. Am. J. Bot. 57, 816–826.Google Scholar
Verma, S. C. and Kapur, S. K. 1972. Genetic systems in homosporous ferns. III. Comparative study of breeding systems in three adiantaceous ferns. Biology Land Plants, pp. 227–240.Google Scholar
White, R. A. 1979. Experimental investigations of fern sporophyte development. In The Experimental Biology of Ferns, ed. Dyer, A. F., pp. 505–549. London: Academic Press.Google Scholar