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Publication Information

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Title: The Chilling Optimum of Idaho and Arizona Ponderosa Pine Buds

Author: Wenny, David L.; Swanson, Daniel J.; Dumroese, R. Kasten

Date: 2002

Source: West J. Appl. For. 17(3):117-­121 2002.

Publication Series: Not categorized

Description: Ponderosa pine (Pinus ponderosa) seedlings from Idaho (var. ponderosa) and Arizona (var. scopulorum) grown in a container nursery received optimum chilling [2,010 hr (84 days) of temperatures below 5°C]. While seedlings were in the greenhouse, days required for 50% of the population to break bud were similar for both seed sources and decreased inverse exponentially from 74 to 23 days as chilling hours accumulated to the optimum. When subsequently placed into either refrigerated or frozen storage, Idaho seedlings broke bud significantly faster than Arizona seedlings when returned to favorable environmental conditions for growth. All seedlings removed from refrigerated storage broke bud faster, were less cold tolerant, and therefore less quiescent than seedlings that had been frozen.

Keywords: Ponderosa pine, chilling requirements, container-grown seedlings

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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Wenny, David L.; Swanson, Daniel J.; Dumroese, R. Kasten 2002. The Chilling Optimum of Idaho and Arizona Ponderosa Pine Buds. West J. Appl. For. 17(3):117-­121 2002.

 


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