Current issue: 58(1)

Under compilation: 58(2)

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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Articles by G. E. Gatherum

Category : Article

article id 4771, category Article
J. G. Gordon, G. E. Gatherum. (1968). Photosynthesis and growth of selected Scots pine populations. Silva Fennica vol. 2 no. 3 article id 4771. https://doi.org/10.14214/sf.a14556
Keywords: Pinus sylvestris; photosynthesis; Scots pine; height growth; provenance; growth; photoperiod
Abstract | View details | Full text in PDF | Author Info

Eight Scots pine (Pinus sylvestris L.) seed sources, ranging from 42° to 66° north latitude, were grown under a constant, 16-hour photoperiod in a greenhouse for approximately 6 months. Rates of photosynthesis, as measured by an IRGA, and growth, as measured by increase in height and fresh and dry weight, differed among seed sources at the end of the six-month growing period. Photosynthetic capacity and growth were strongly related to latitude of seed source, and were greatest in the seed sources coming from a parent environment in which maximum photoperiods are about 16 hours.

Photosynthetic efficiency (rate of photosynthesis per gram needle weight) was also strongly related to latitude of seed source, but was lowest in the seedlings which exhibited the greatest growth and photosynthetic capacity. This may have been due to (1) more mutual shading of needles on the larger seedlings and (2) a lesser proportion of juvenile needles on the larger seedlings or (3) biochemical differences in the use of photosynthate in the needles. Seed source and light intensity had an interacting effect on rates of photosynthesis only in seedlings of the two northernmost seed sources.

The PDF includes a summary in Finnish.

  • Gordon, E-mail: jg@mm.unknown (email)
  • Gatherum, E-mail: gg@mm.unknown

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