Ministry of Forests Forest Science Program
		Abstract for FRDA Report 057

		Factors Affecting Cone and Seed Production in Douglas Fir
		Authors or Ministry Contacts: A.M. Colangeli, J.N. Owens and S.J. Morris
		Branch: Research
		Subject: Seeds and Pollen
		Series: FRDA Report
		Other details: Published February 1989

Abstract

The causes of reduced seed yield in four Douglas fir (Pseudotsuga menziesii Mirb. Franco) trees at the Dewdney Seed Orchard in 1986 were found to be inadequate pollination (30%), low pollen vigor or viability (14%), embryo abortion (14%) and early ovule abortion (5%). The average seed efficiency (+ s.e.) for the four trees was 40 (+ 7). Conelet abortion in the four trees, averaged 43%, ranging from 20 to 64% per tree. Recommendations for increasing seed yield are discussed.

Download FRDA Report 057 (563KB)
	To view this document you need the Adobe Acrobat Reader, available for free at the Adobe Web Site.