HERITABILITY ESTIMATES OF THERMODORMANCY IN LETTUCE

in HortScience
Authors:
Dennis RayUniversity of Arizona, Tucson, AZ 85721

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Steven SmithUniversity of Arizona, Tucson, AZ 85721

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Mark HurlburtUniversity of Arizona, Tucson, AZ 85721

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Lettuce (Lactuca Sativa L.) seeds imbibe water but most fail to germinate, This phenomenon now termed “thermodormancy” is prevalent in arid and semiarid climates like the southwest desert regions, Inheritance studies of thermodormancy were performed in two lettuce cultivars, Dabora (Dutch butterhead) and PI 251245 (a plant introduction from Egypt). Dabora will germinate up to 27 C and PI 251245 up to 36C. Reciprocal crosses were made. Pericarp color was used as a marker to determine successful crosses. Dabora X PI 251245 was used to estimate the heritability of thermodormancy by germinating seed from 10 F3 families and 160 F4 families at “high” temperatures.

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