THE RELATIONSHIP BETWEEN TEMPERATURE AND SEEDLING GROWTH OF TWO SPECIES WHICH OCCUR IN UPPER TEESDALE

• Published in: New Phytologist
• Main Author: ARNOLD, SYLVIA M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1974
• Subjects: Kobresia simpliciuscula
• Online Access: http://dx.doi.org/10.1111/j.1469-8137.1974.tb04767.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-8137.1974.tb04767.x; https://nph.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8137.1974.tb04767.x

S ummary Seedlings of Plantago maritima L. and Kobresia simpliciuscula (Wahlenb.) Mackenzie were grown at 10, 14, and 18° C. Net assimilation rate and relative growth rate of Plantago seedlings increased with temperature, as did rate of leaf extension, and there was little delay in leaf emergence as temperature dropped from 18 to 10° C. Increase of temperature from 10 to 14° C had little effect on Kobresia seedlings, but growth increased significantly with a further rise to 18° C. Rate of leaf extension was unaffected by temperature but leaves grew for a shorter time, and emergence was greatly delayed at the lower temperatures. Increase in total leaf length with temperature was attributable to increase in number of leaves in Kobresia , and increase in average leaf length in Plantago. In both species successive leaves elongated at a similar rate, and temperature had no effect on leaf width. Growth responses are discussed in relation to temperature regimes measured in Teesdale.