Environmental effects on genetic variation of chilling resistance in cucumber |
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Authors: | Lambertus Smeets Todd C Wehner |
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Institution: | (1) Department of Horticultural Science, North Carolina State University, Raleigh, NC, 27695-7609, U.S.A |
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Abstract: | Environmental effects on genetic variation for chilling resistance were studied in nine cultivars and breeding lines (referred
to as cultigens hereafter) of cucumber (Cucumis sativus L.). Five experiments were carried out in controlled-environment chambers
to measure the effects of growth temperature, photoperiod, duration of chilling, light level during chilling, and watering
frequency on chilling resistance of seedlings at the cotyledon and first true leaf growth stages. Significant interactions
were found between cultigen and all environmental factors studied except for the photoperiod and watering frequency. Cultigen
rank was affected by growth temperature before chilling, chilling duration, and light level during chilling, but shifts in
rank were not consistent. Genetic variation was largest when the plants were grown at 22/18 °C, most pronounced after a chilling
duration of 5 to 9 hours and a light level during chilling of 270 μmol·m-2·s-1. Variation was larger at the first true leaf stage than at the cotyledon stage. Differences among cultigens in chilling damage
were largest 5 days after chilling. Therefore, it seems that testing for genetic variation in chilling damage can be restricted
to one set of environmental conditions. We recommend the following conditions for screening cucumber for genetic variation
in chilling resistance: grow the plants at 22/18 °C, under a 9-hour photoperiod with a 3-hour night interruption, water them
once daily, subject them at the first true leaf stage to a chilling treatment of 7 hours at 4°C at a light level of 270 μmol·-2·s-1, and evaluate damage 5 days after treatment.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Cucumis sativus chilling injury cold shock damage low-temperature tolerance vegetable breeding |
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