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Genetic variation at early ages for several traits of interest for timber-production breeding of Juglans regia

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Several traits of common walnut (Juglans regia L.) were assessed during the first three growing seasons in a progeny test of 43 open-pollinated families at two sites in northwestern Spain. Variance components, heritabilities and correlations between traits were calculated for all characteristics measured. Significant differences were found among families with regard to growth, phenology, frost damage, number of apical branches, and Phytophthora cinnamomi Rands damage, but not for growth-habit traits (number of branches, stem form, and apical dominance). Heritabilities were moderate for total height (h2i ≥ 0.32; h2f ≥ 0.63) and late-spring frost damage (h2i = 0.29; h2f = 0.57), high for resistance to P. cinnamomi (h2i = 0.76; h2f = 0.85), and low for phenology (h2i = 0.15; h2f = 0.39 for bud burst, and h2i = 0.14–0.36; h2f= 0.44–0.70 for leaf fall) and root-collar diameter (h2i = 0.18–0.29; h2f = 0.41–0.58). High age–age correlations were found for growth and phenology traits during the first three growing seasons. Some interesting correlations were also found between several of the traits studied. The families whose buds burst the earliest had more late-spring frost damage and, consequently, more apical branches (i.e., branches near the apical bud). Furthermore, the greater the resistance to P. cinnamomi and frost damage, the taller the families.

Plusieurs traits du noyer commun (Juglans regia L.) ont été évalués pendant les trois premières saisons de croissance dans un test de descendance avec 43 familles à pollinisation libre dans deux stations du nord-ouest de l'Espagne. Les composantes de la variance, les héritabilités et les corrélations entre les traits ont été calculées pour toutes les caractéristiques mesurées. Des différences significatives ont été notées entre les familles pour la croissance, la phénologie, les dommages dus au gel, le nombre de branches apicales et les dommages causés par Phytophtora cinnamomi Rands mais non pour les traits reliés aux habitudes de croissance (nombre de branches, forme de la tige et dominance apicale). Les héritabilités étaient modérées pour la hauteur totale (h2i ≥ 0,32; h2f ≥ 0,63) et les dommages dus au gel tardif (h2i = 0,29; h2f = 0,57), élevées pour la résistance à P. cinnamomi (h2i = 0,76; h2f = 0,85) et faibles pour la phénologie (h2i = 0,15; h2f = 0,39 pour l'éclosion des bourgeons et h2i = 0,14–0,36; h2f = 0,44–0,70 pour la chute des feuilles) et le diamètre au collet (h2i = 0,18–0,29; h2f = 0,41–0,58). De fortes corrélations entre les âges ont été observées pour les traits de croissance et de phénologie au cours des trois premières saisons de croissance. Des corrélations intéressantes ont également été notées entre plusieurs des traits étudiés. Les familles dont les bourgeons débourraient le plus tôt avaient plus de dommages dus au gel tardif et par conséquent plus de branches apicales (c.-à-d., des branches près du bourgeon apical). De plus, plus les familles étaient résistantes à P. cinnamomi et aux dommages dus au gel, plus leur dimension était forte.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2005

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