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Growth, morphology, and cold hardiness of Chamaecyparis nootkatensis seedlings originating from an abbreviated reproductive cycle

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Abstract:

A common garden study investigated growth, morphology, and cold hardiness of yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) seedlings originating from seed that had matured at an accelerated rate. This early maturing seed, produced at a low-elevation southern Vancouver Island seed orchard, was known to have similar germinability and seedling morphology as high-elevation normally maturing seeds. Population differences in 3-year-old seedlings were evident only in shoot harvest index (ratio of stem/shoot dry weight). The amount of stem elongation that occurred prior to the formation of secondary foliage (juvenile height) and harvest index were weakly correlated with source elevation at which maternal parents were developed. Traits that exhibited no discernable differences between progeny from early maturing seed and the control normally maturing seed included midwinter cold hardiness testing and selected measures of shoot morphology and growth. The control seedlings had significantly less height growth prior to the transition of primary foliage to secondary foliage formation than did the seedlings originating from early maturing seed.

Une étude réalisée en plantation a porté sur la croissance, la morphologie et la tolérance au froid de semis de faux-cyprès de Nootka (Chamaecyparis nootkatensis (D. Don) Spach) provenant de graines arrivées à maturité de façon accélérée. Ces graines à maturité hâtive, produites dans un verger à graines situé à faible altitude au sud de l'île de Vancouver, sont réputées avoir la même faculté germinative et donner des semis dont la morphologie est semblable à celle des semis issus de graines à maturation normale produites à haute altitude. Les différences entre les populations de semis âgés de 3 ans étaient évidentes seulement pour l'indice de récolte (rapport du poids sec de la tige sur celui des pousses). La proportion d'élongation de la tige qui survenait avant la formation des feuilles secondaires (hauteur juvénile) et l'indice de récolte étaient faiblement corrélés avec l'altitude à laquelle croissaient les parents maternels. Les caractères qui n'ont montré aucune différence discernable entre les descendances provenant de graines à maturation hâtive et les descendances témoins provenant de graines à maturation normale incluaient la tolérance au froid testée au milieu de l'hiver et des mesures de la morphologie des pousses et de la croissance qui avaient été retenues. Les semis témoins avaient une croissance en hauteur significativement plus faible avant la transition entre la formation du feuillage primaire et celle du feuillage secondaire que les semis issus de graines à maturation hâtive.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2002

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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