Propagation: - Cone size & seed viability | UBC Botanical Garden …
2024年10月9日 · Some of the cones are quite small, about 2 cm long. The largest are about 6 cm long. I expect there to be substantial size variation in the seeds, once the cones open. Both smaller seeds, and more seeds that aren't filled. In general will the seeds from smaller cones not work as well for propagation?
Evolution of the coniferous seed scale - PMC
Examination of seed cones of extant conifers shows that ovules occur in three different positions in the cone: in an axillary position, replacing a leaf or terminating the cone axis. By interpreting the fertile appendage or seed-bearing structure as a leaf, not all positions are possible.
Detailed seed cone morpho-anatomy of the Prumnopityoid clade: …
This study describes the detailed seed cone morpho-anatomy and combines it with available fossil seed cone records and evaluates the diversity and evolution of functional traits among the genera of the Prumnopityoid clade.
PLB 102 | Lab 9 - UC Davis
2012年2月22日 · The seed cones are upright on the branches, and upon maturity, the cone scales fall off, leaving the upright cone axis on the stem. The needles of most species are rather blunt-tipped, but Santa Lucia Fir ( A. bracteata ) is a …
At pollination time the cones are plagiotropic or point downwards. The cone scales are inserted in whorls of three. One whorl of transitional leaves is developed below the cone, which is counted by some authors as part of it. The cone scales of the proximal whorl are sterile or develop only one ovule per cone scale (figs 4B, 4F).
Detailed Seed Cone Morpho-Anatomy Provides New Insights into Seed Cone …
2023年11月19日 · We investigated detailed seed cone morpho-anatomy using staining and sectioning techniques to clarify the anatomical, morphological diversity and evolution of functional traits. The presence of a fleshy receptaculum is a characteristic feature of both clades.
Evolution of the coniferous seed scale - Oxford Academic
2021年12月21日 · Examination of seed cones of extant conifers shows that ovules occur in three different positions in the cone: in an axillary position, replacing a leaf or terminating the cone axis. By interpreting the fertile appendage or seed-bearing structure as a …
Why are the seed cones of conifers so diverse at pollination?
The seed cones of conifers are compact branching systems composed of reiterated units that typically consist of two separate structures: a bract, or modified leaf, that subtends an ovuliferous scale, which is a modified seed-bearing shoot (Florin, 1951; Owens et al., 1998; Taylor et al., 2009). The terminology associated with this basic ...
Extraction is a critical point in processing and monitoring unextracted seeds per cone is very important. If all viable seeds are not removed from the cones at this point in time it can have a large impact on yield, and there is no second chance. It is important to determine through cutting tests whether unextracted seeds are via-
Seed cone structure in conifers in relation to development and ...
In the majority of conifers there is no consistent ovule-bearing structure, even though this is required by the model; much of cone ontogeny is determined by intercalary meristematic activity that results in cone closure after pollination. Two main constructional types can be recognized.