植物激素与木材形成  

PLANT HORMONE AND WOOD FORMATION

作　　者：沈惠娟[1] 

机构地区：[1]南京林业大学森林资源与环境学院

出　　处：《林业科学》1996年第2期165-170,共6页Scientia Silvae Sinicae

基　　金：国家自然科学基金

摘　　要：综述了植物激素在树木维管组织分化中的作用．生长素是调节木质部细胞分化的主要因子；细胞分裂素在诱导分生组织发端和分生细胞分化上起重要作用；赤霉素促进纤维的形成，赤霉素和生长素结合使用，可有效地促进次生木质部中纤维分化；乙烯能促进树木韧皮部和木质部分化。还讨沦了木材形成过程中的三个主要问题：生长素含量的多少直接控制了沿树轴木质部导管、管胞的大小和密度；外界环境因子影响木质部细胞分化；温带落叶阔叶树环孔材和散孔材形成的机理，生长素控制环孔材树种早材宽导管的形成以及晚材窄导管和纤维形成的假说。对今后改善树木木材的质和量上有一定参考价值。This paper provides a summary of the role of plant hormone in vascular differetiation.Auxin is a major factor in regulating cell differetiation of the xylem, cytokinin plays an important role of bringing meristematic initials and cells differetiation, gibberellin promotes fiber formation,an application of combining of both auxin and gibberellin can stimulate fiber differetiation of secondary xylem,ethylene promots the differetiation of xylem and phloem in tree.This paper discusses three major problems during wood formation.First,the level of auxin controls size and density of vessel and tracheid in xylem along the tree axis.Second,environmental factors influence cells differetiation of xylem.Third,regard with to the machine of ring-porous versus diffuseporous wood formation in temperate deciduous hardwood trees.A new hypothesis was put forwarded regarding the growth regulator control of wide earlywood vessel formation in ring-porous trees and the control of narrow vessels and fibers in the latewood. This discussion is of great value in terms of improving wood productivity and quality in the future.

关 键 词：植物激素 木质部 导管 分化 

分 类 号：Q946.885[生物学—植物学]