Sexual reproduction in a greenhouse and reduced autumn frost hardiness of Picea abies progenies.

@article{Johnsen1995SexualRI,
  title={Sexual reproduction in a greenhouse and reduced autumn frost hardiness of Picea abies progenies.},
  author={\Oystein Johnsen and Tore Skr\oppa and Gunnar Haug and Inger Apeland and Geir \OStreng},
  journal={Tree physiology},
  year={1995},
  volume={15 7_8},
  pages={551-555}
}
In 1989, identical crosses (2-3 females within males) were performed with Picea abies (L.) Karst. in a greenhouse seed orchard at Biri nursery and in an outdoor seed orchard at Huse, 32 km north of Biri. Pollination began 17 days earlier in the greenhouse than outdoors at Huse. The potted grafts in the greenhouse were moved outdoors when the seed cones were no longer receptive. Twelve full-sib family pairs (Biri and Huse) from these crosses were grown in a phytotron and tested for height and… CONTINUE READING