文献类型：期刊文献

中文题名：不同苗龄沙地柏抗旱生理特性比较研究

英文题名：Age-based Variation of Several Drought-resistance Physiological Characteristics for Juniperus sabina

作者：赵秀莲[1,2] 夏新莉[2] 尹伟伦[2] 江泽平[1] 肖文发[3] 刘建锋[1]

第一作者：赵秀莲

机构：[1]中国林业科学研究院林业研究所国家林业局林木培育重点实验室;[2]北京林业大学生物学院;[3]中国林业科学研究院森林生态环境与保护研究所

年份：2013

卷号：33

期号：12

起止页码：2513-2520

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家林业局"948"项目(2006-4-55);国家"十二五"科技支撑项目(2011BAD38B01)

语种：中文

中文关键词：沙地柏;苗龄;抗旱性;生理指标;差异

外文关键词：Juniperus sabina ; seedling age; drought resistance ; physiological characteristicsi ; variation

分类号：Q945.78

摘要：以相同来源的1、3、5年生沙地柏幼苗为材料,采用室内生长池人工控水模拟不同干旱胁迫条件,对10个抗旱相关生理指标进行考察,探讨沙地柏苗龄对其抗旱特性影响。结果表明:(1)沙地柏叶片的保水力、细胞膜透性、RuBP羧化酶活性在胁迫前不同苗龄间差异显著,而叶片相对水分亏缺、气孔导度等指标不同龄苗间差异不显著。(2)在干旱胁迫条件下,随土壤含水量的降低,不同苗龄沙地柏的叶片水分亏缺、气孔导度差异一直不显著,而其净光合速率、蒸腾速率、水分利用率、胞间CO2浓度在6.78%土壤水分含量时出现显著差异;当土壤水分含量降低到4.52%时,不同苗龄的叶片光量子效率也出现显著差异。(3)各苗龄组随着干旱胁迫的加剧,5年生沙地柏净光合速率、RuBP羧化酶活性、光量子效率显著低于1年生沙地柏,而其胞间CO2浓度显著高于1、3年生沙地柏,并且其气孔导度、蒸腾速率随土壤水分含量降低而下降的幅度最大,水分利用率增加幅度比1、3年生的更多。研究表明,不同苗龄沙地柏幼苗抗旱性指标对干旱胁迫的响应程度存在差异,抗旱指标对苗龄的稳定性不同;干旱胁迫条件下低苗龄沙地柏比高苗龄的生长势更强,更有生命活力,但高苗龄沙地柏对水分胁迫的适应能力强于低苗龄;另外,在进行抗旱鉴定时,试验苗木年龄最好一致,抗旱鉴定指标选取也需考虑其对材料年龄的敏感性及稳定性。
Variations of age or developmental stage could influence plants＇ ability for drought resistance. Ten drought-resistance physiological characteristics of Juniperus sabina at three ages were measured in this paper. Results indicated that： （1）The values of water-losing rate were already significantly different among different seedling ages under the condition of normal water supply, so were relative permeability of membrane and RuBP activity. But there was no significantly difference on relative water deficiencies （RWD） ,stomatal conductance（Gs）,net photosynthesis （Pn） rate etc. among these three seedling ages. （2） Under water stress, there was still no significant difference on RWD and Gs among these three seedling ages all along. The Pn ,transpiration rate（Tr）,water use efficiency （WUE）and intercellular carbon dioxide concentration （Ci） of these three seeding ages were significantly different when the SWC is 6.78%. As the SWC got down to 4.52%,significant difference appears among these three ages on their light-use efficiency. （3）Comparison of these three age-groups showed that Pn,RuBP activity and light-use efficiency of the 5-year old seedlings were significantly lower than that of the 1-year old seedlings＇ under water stress. Nevertheless,Ci ,magnitude of the declines in Gs and Tr,and magnitude of the increase in WUE of the 5-year old seedlings were significantly higher than that of the 1 and 3-year old seedlings＇. Thus it can be seen that seedlings＇ responses to drought stress may differ between different seeding ages. The stability of the drought-resistance indicators to age were different. The 1-year old seedlings have more life vitality than 5- year old seedlings and the 5-year old seedlings were much more adaptable to water stress. We should better choose the materials at the same age during drought resistance appraisal ,and the sensitivity and stability of indicators to seedlings＇ age must be considered.