Effect of rootstock on photoperiodic control of elongation growth in grafted ecotypes of Salix |
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Authors: | Olavi Junttila |
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Affiliation: | Dept of Plant Physiology and Microbiology, Univ. of Tromsø, P.O. Box 3085 Guleng, N-9001 Tromsø, Norway |
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Abstract: | Scions of a southern (59° 40'N Lat.) and a northern (69° 39'N Lat.) ecotype of Salix pentandra L. were grafted on clonal rootstocks of the same ecotypes. Effects of photoperiod on elongation growth of the 4 combinations (south/south, south/north, north/south and north/north) were studied in a phytotron at 18° and 15°C. The photoperiodic response was primarily dependent on the ecotype of the scion, but this response was significantly modified by the rootstock. Cessation of apical growth was advanced by a northern clone and delayed by a southern clone as a rootstock. The results indicate that the critical photoperiod for cessation of apical growth could be slightly decreased by a northern and increased by a southern rootstock. |
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Keywords: | Bud-set cessation of apical growth ecotype photoperiod rootstock Salix pentandra shoot growth willow |
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