首页 | 本学科首页   官方微博 | 高级检索  
     


Genetic parameters of morphological and physiological characteristics of containerized white spruce (Picea glauca [Moench.] Voss) seedlings
Authors:Sylvie Carles   Mohammed S. Lamhamedi   Jean Beaulieu   Debbie C. Stowe  Hank A. Margolis
Affiliation:(1) Centre d’?tude de la for?t (CEF), Facult? de foresterie, de g?ographie et de g?omatique, Pavillon Abitibi Price, Universit? Laval, 2405 rue de la Terrasse, Qu?bec, QC, G1V 0A6, Canada;(2) Direction de la Recherche Foresti?re, For?t Qu?bec, Minist?re des Ressources naturelles et de la Faune, 2700 rue Einstein, Qu?bec, QC, G1P 3W8, Canada;(3) Natural Resources Canada, Canadian Forest Service, Canadian Wood Fibre Centre, 1055 rue du P.E.P.S., Stn. Sainte Foy, P.O. Box 10380, Quebec, QC, G1V 4C7, Canada
Abstract:The root systems of containerized seedlings must be sufficiently developed and have adequate root plug cohesion to permit handling and the planting of the seedlings with minimal root damage. Genetic variability in morphological and physiological seedling characteristics of 75 open-pollinated white spruce families was estimated to determine whether genetic selection for improved seedling root systems is possible. Seedlings were grown for 2 years under standard cultural practices in a forest nursery. Gas exchange measurements and seedling morphological characteristics (height, diameter, shoot and root dry mass, root to shoot ratio) were measured at the end of the two growing seasons whereas seedling mineral (N, P, and K) status was assessed at the end of the first growing season. Genetic parameters (heritabilities—h 2—and genetic correlations) were estimated for every seedling characteristic and a strong genetic control associated with a large genetic variation was observed at both family (0.20 ≤ hf2 h_f^2  ≤ 0.88) and individual (0.21 ≤ hi2 h_i^2  ≤ 0.97) levels. A single, late-season measurement of physiological characteristics did not reveal physiological basis for family variability in seedling root growth. Nevertheless, the family variation was large enough to permit genetic improvement of 2-year-old seedling juvenile morphological characteristics. Strong, positive genetic correlations enable us to foresee using root collar diameter as an effective method for indirectly selecting white spruce families with heavier root systems.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号