tailieunhanh - Báo cáo khoa học: "Genetic determination of vessel area in oak (Quercus robur L and Q petraea Liebl): a characteristic related to the occurrence of stem shakes"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Genetic determination of vessel area in oak (Quercus robur L and Q petraea Liebl): a characteristic related to the occurrence of stem shakes. | 395s Ann Sci For 1993 50 Suppl 1 395S-398S Elsevier INRA Original article Genetic determination of vessel area in oak Quercus robur L and Q petraea Liebl a characteristic related to the occurrence of stem shakes RA Mather PJ Kanowski PS Savill Oxford Forestry Institute Department of Plant Sciences University of Oxford South Parks Road Oxford 0X1 3RB UK Summary The term shake describes the presence of longitudinal separations in the wood of living trees. Predisposition to shake in Quercus robur and Q petraea increases with the cross-sectional areas of earlywood vessels. Investigations suggest that vessel area is under strong genetic control and is related to provenance and to the timing of leaf emergence in the spring. These results are promising for those concerned with selecting oak varieties less prone to shake or wishing to recognize and remove shake-prone trees early in rotations. heritability Quercus shake wood quality phenology Resume Déterminisme génétique du diamètre des vaisseaux du bois Chez le chêne Quercus robur et Q petraea Liebl une caractéristique liée à la sensibilité aux fentes internes du tronc. Le terme de fente désigne la presence de separations longitudinales dans le bois des arbres vi-vants. La predisposition aux fentes Chez Quercus robur et Q petraea augmente avec la surface de la section transversale des vaisseaux du bois initial. Des recherches suggèrent que la surface des vais-seaux est soumise à un controls génétique fort niveau intraspecifique et niveau génétique individuel ainsi qu à la periods d apparition des feullles au printemps. Ces résultats sont prometteurs pour ceux qui s interessent à la selection des variétés de chêne peu sensibles aux fentes du tronc OU qui souhai-tent repérer et éliminer précocement les arbres sensibles aux fentes tors d eclaircies. héritabilité Quercus íente du tronc qualité du bois phénologie INTRODUCTION The timber defect known as shake is described by Panshin and de Zeeuw 1980 as . longitudinal .