Monday, 28 November 2016

Verification of a phenotypic discrimination method for hybrid larch seedlings using DNA markers

Published Date
Volume 19, Issue 5pp 461–468

Original Article
DOI: 10.1007/s10310-014-0

Cite this article as: 
Kita, K., Uchiyama, K., Ichimura, Y. et al. J For Res (2014) 19: 461. doi:10.1007/s10310-014-0438-1

Author
  • Kazuhito Kita
  • Kazuko Uchiyama
  • Yasuhiro Ichimura
  • Yoshinari Moriguchi
  • Yoshihiko Tsumura
  • Makoto Kuromaru
Abstract

The hybrid between Kuril larch (Larix gmelinii var. japonica) and Japanese larch (Lkaempferi) is an important afforestation tree species in Hokkaido, Japan, because of its rapid juvenile growth, straight stem, and resistance to bark gnawing by voles. To produce desirable hybrid seedlings, precise seedling discrimination is essential. However, continuous variations in morphological and phenological traits occur across L. gmelinii var. japonica × L. kaempferi and L. gmelinii var. japonica × L. gmelinii var. japonica seedlings. Therefore, we used DNA markers to verify and improve the morphological and phenological discrimination method. We collected seeds from an interspecific seed orchard and, using chloroplast DNA analysis, we showed that the hybridization rates of 1-year-old seedlings were different between years (2004, 23.2 %; 2005, 53.6 %) and between mother trees (2004, 5.8–39.4 %; 2005, 20.0–81.0 %). Discriminant analyses revealed that the root collar diameter of 2-year-old seedlings, number of sylleptic branches of 2-year-old seedlings, and day of terminal bud set in 1- and 2-year-old seedlings are traits that aid in discriminating hybrid seedlings. The proportions of correctly discriminated individuals were found to be 81.7–88.2 % when using improved phenotypic discrimination methods. These methods adopted traits with high discrimination abilities during discriminant analyses and determined the selection intensity according to the hybridization rate estimated from the DNA markers. In contrast, the proportions of correctly discriminated individuals obtained using the current method were lower, 72.7–78.5 %, because this method was based on seedling height and adopted a constant selection intensity.

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http://link.springer.com/article/10.1007/s10310-014-0450-5

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