Abstract
Limited information exists for container production of golden barberry cultivars. The objective of this study was to evaluate root thermostability of container-grown Berberis thunbergii `Monlers' (Gold Nugget™) and Berberis sp. `Bailsel' (Golden Carousel™). Bare root cuttings were planted in 2.7-L containers in an amended 6 pinebark: 1 sand (v/v) substrate in Apr. 1997. Plants were grown under overhead irrigation for 6 months in a completely randomized block design. Young, unsuberized root tips (1.0–2.5 cm), were subjected to temperature treatments from 20 to 63 °C in a thermostatically controlled water bath prior to electrolyte leakage determinations. `Golden Carousel' was more heat-tolerant (critical temperature midpoint = 49.4 ± 0.3 °C) than `Monlers' (critical temperature midpoint = 48.0 ± 0.4 °C). Implications of these differences for container production will be discussed.
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