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Absolute Levels of Some Endogenous Hormones in stems and Wood Formation of Conifers

针叶树茎和木材形成中某些内源激素的绝对水平

基本信息

批准号：
63480064
负责人：
FUSHITANI Masami
金额：
$ 3.9万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63480064/
关键词：
Latewood formation Endogenous hormones Indole-3-acetic acid Abscisic acid Ctyokinins Cambial activity Transition to latewood Rate of latewood cell production 常緑性針葉樹細胞分裂細胞分化インド-ル酢酸晩材への移行時期木部細胞オーキシン GC-MS 晩材

项目摘要

Specific gravity used as an important index of wood properties is closely related to the quantitative pattern of early- and latewood formation in stems of conifers. In this study, seasonal process of early- and latewood formation was observed using pin-marking or cutting methods, and some endogenous hormones such as indole-3-acetic acid (IAA), abscisic acid (ABA) and cytokinins (CKs), which included in cambial, phloem and differential zone, was qualitatively and quantitatively analyzed throughout a growing season.1) The quantitative variation on latewood observed among trees or in stems of a tree indicated the relation to the rate of latewood cells production, and it was considered that the rate was influenced by activity of earlywood formation, namely the time of transition to latewood and the rate of earlywood cell production.2) The transition to latewood was brought about by the considerable reduction of IAA levels, and it occurred when the levels decreased in region of 120-160ng/cm … More ^2. Maximum peak of IAA concentration effected on the time of transition to latewood and the rate of earlywood cell production. In the stem just below crown base after pruned remarkably, IAA maintained higher level during relative long period, resulting in increase of production of latewood cells. As for ABA known as inhibiting substance for growth, the seasonal variation was little recognized within stems or in any trees, so that it was not found the relation to the wood formation.3) In deciduous and evergreen trees, IAA was present more less in cambial zone of stems even during the dormancy, and it brought about the reactivation of cell division, before IAA was synthesized in new bud and leaves. But cambial and differential activity after initial stage may be influenced by current IAA.4) Ribosilzeathin was found in cambial zone of stem, which was a kind of CKs known as promoting substance. However the relation to wood formation was not recognized, because seasonal variation on its concentration was obscure. Less

比重作为木材性质的重要指标，与针叶树茎中早、晚木材形成的数量规律密切相关。本研究采用针标法和扦插法观察了早、晚材形成的季节过程，并对形成层、韧皮部和差动带的吲哚-3-乙酸（IAA）、脱落酸（ABA）和细胞分裂素（ck）等内源激素在整个生长季节进行了定性和定量分析。1)树木间或树干中晚木的数量变化反映了晚木细胞产生速率的关系，认为晚木细胞产生速率受早木形成活性，即向晚木过渡的时间和早木细胞产生速率的影响。(2) IAA水平的显著降低导致了向晚木的过渡，并在120 ~ 160ng/cm范围内发生。IAA浓度最大峰对晚木过渡时间和早木细胞生产速率的影响。在修剪后的冠基部下方茎中，IAA在较长时间内保持较高水平，导致晚木细胞产量增加。对于被称为生长抑制物质的ABA，其在茎内或任何树木上的季节变化都很少被识别，因此没有发现其与木材形成的关系。3)在落叶乔木和常绿乔木中，即使在休眠期间，IAA在茎形成层的含量也较少，在新芽和新叶中合成IAA之前，IAA会引起细胞分裂的重新激活。4)茎形成层区存在核糖素（Ribosilzeathin），是一种被称为促进物质（ck）的物质。然而，由于其浓度的季节变化不明显，因此无法识别其与木材形成的关系。少