Stomatal resistance of three potato cultivars as influenced by soil water status, humidity and irradiance |
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Authors: | R J Gordon D M Brown M A Dixon |
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Institution: | (1) Plant Industry Branch, Nova Scotia Department of Agriculture and Marketing, B2N 5E3 Truro, Nova Scotia, Canada;(2) Department of Land Resource Science, University of Guelph, N1G2W1 Guelph, Ontario, Canada;(3) Department of Horticulture, University of Guelph, N1G 2W1 Guelph, Ontario, Canada |
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Abstract: | Summary Leaf stomatal resistance varies considerably in response to changes in environmental conditions. Understanding cultivar differences
in the response of stomata to these conditions is important for effectively simulating water-use and growth.
In this study the stomatal resistance of three field grown potato (Solanum tuberosum L.) cultivars Atlantic. Monona and Norchip was observed in response to photosynthetic photon flux density, leaf to air vapour
pressure difference and root zone available soil water. Substantial variation in stomatal resistance was accounted for by
functions of the environmental variables for both Monona and Norchip. The explained variation for Atlantic was considerably
less. Light saturation occurred near 500 μmol m−2 s−1. Increasing stomatal resistance above 1000 μmol m−2s−1 was also observed but is likely an artifact of stomatal closure on days in which mid-day leaf water potentials dropped below
critical levels. Although the leaf presumably insufficient to obtain substantial effects. The soil water status was partially
linked to the average 1000 h to 1500 h stomatal resistance on clear, sunny days. Significant differences were observed among
the cultivars in the response of stomata to changes in the available soil water. |
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Keywords: | minimum stomatal resistance soil water Solanum tuberosum L photosynthetic photon flux density vapour pressure deficit |
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