Download e-book for kindle: 3 - Trees in polyhedral maps by Barnette D. W.

By Barnette D. W.

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Pp. 85–134. , M. Jager, et al. 1998. Phylogenetic relationships of conifers inferred from partial 28S rRNA gene sequences. American Journal of Botany 85: 688–697. Stephan, G. and L. Tien. 1986. Development of pine resin production in Vietnam (translated from German). Soz. Forst. 36: 120–121. Stewart, W. and G. Rothwell. 1993. Paleobotany and the evolution of plants. Cambridge University Press, New York. 521 p. Taylor, T. and M. Millay. 1979. Pollination biology and reproduction of early seed plants.

But karyotypic orthoselection is another explanation yet to be ruled out. This refers to the active process of selecting against genomic divergence. Here, a strong selective force conserves the genome, blocking any change to basic chromosome number or karyotypic similarity (Brandham and Doherty 1998). Karyotypic orthoselection could be stringent enough to restrict large-scale chromosomal rearrangements for the Pinaceae even though small-scale chromosomal rearrangements such as paracentric inversions do occur (Saylor and Smith 1966; Shepherd and Williams 2008).

The rib meristem, or Zone 4, matures into the pith of the stem axis (Sacher 1954). Of these, only the peripheral tissue zone (Zone 3) is relevant to this discussion. 5 Female and Male Strobilus Development In some apices, male and female strobilus initials may form from Zone 3 tissues by late summer. All apices produce shoot growth so each year, it is a different apical cell lineage that gives rise to another set of reproductive initials. Each year, these reproductive cells differentiate into initials which develop into either male or female strobili.

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3 - Trees in polyhedral maps by Barnette D. W.

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