文献类型：期刊文献

中文题名：干旱胁迫对降香黄檀幼苗生长及内源激素含量的影响

英文题名：Growth and endogenous hormone content of Dalbergia odorifera seedlings under drought stress

作者：贾瑞丰[1] 杨曾奖[1] 徐大平[1] 张宁南[1] 刘小金[1] 陈美红[1]

第一作者：贾瑞丰

机构：[1]中国林业科学研究院热带林业研究所

年份：2013

卷号：22

期号：7

起止页码：1136-1140

中文期刊名：生态环境学报

外文期刊名：Ecology and Environmental Sciences

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

基金："十二五"农村领域国家科技计划课题(2012BAD01B0504);林业公益性行业专项项目(20110400106);广东省林业科技创新专项项目(2012KJCX004-01)

语种：中文

中文关键词：降香黄檀;干旱胁迫;内源激素

外文关键词：Dalbergia odorifera; drought stress; endogenous hormone

分类号：Q945.78

摘要：设置对照(CK),轻度干旱胁迫(LS),中度干旱胁迫(MS)和重度干旱胁迫(HS)4种水分处理,采用温室盆栽方法研究降香黄檀(Dalbergia odorifera T.Chen)幼苗生长及叶片内源激素对干旱胁迫的响应。结果表明,①随着干旱胁迫强度增加,幼苗苗高、地径和整株生物量呈递减趋势,重度干旱处理(HS)时三者达到最小值分别是50.83 cm、8.38 mm和26.60 g.株-1,比对照(CK)分别降低了23.67%、13.52%和25.04%。②随着干旱胁迫强度增加,降香黄檀幼苗w(ABA)(以鲜质量计)逐渐增加,重度干旱处理(HS)123.04 ng.g-1比对照(CK)81.26 ng.g-1增加了51.41%;w(IAA)(以鲜质量计)和w(ZR)(以鲜质量计)逐渐减少,其最小值分别是99.49 ng.g-1和8.89 ng.g-1,比对照(CK)分别降低了23.88%和47.50%;w(GA)(以鲜质量计)变化为先增加后降低,重度干旱处理(HS)最小值4.14 ng.g-1比轻度干旱处理(LS)最大值9.39 ng.g-1降低了55.91%。不同处理间各内源激素含量均达到差异显著。③随着干旱胁迫强度增加,幼苗内源激素含量比例IAA/ABA,GA/ABA,ZR/ABA和ZR/IAA呈现递减趋势,最小值分别较对照(CK)降低了46.68%,65.33%,65.34和34.93%,GA/IAA呈现出先增加后降低趋势。④幼苗生长指标变化趋势说明幼苗可以通过降低苗高和减少叶面积等来适应干旱,内源激素含量变化说明幼苗通过调节自身激素水平来响应外界干旱胁迫,但重度干旱严重限制了幼苗生长,说明降香黄檀幼苗的抗旱能力有限。
A greenhouse experiment was conducted to study the growth and endogenous hormone content of Dalbergia odorifera seedlings under water stress. Four treatments were arranged：control （CK）, light water stress （LS）, moderate water stress （MS） and heavy water stress （HS）. The results showed that： ① Seedling height, ground diameter and whole biomass decreased as the drought stress increased, the minimum values were 50.83cm, 8.38mm and 26.60 g？seedling-1, it was decreased by 23.67%, 13.52% and 25.04%compared to the control. ② ABA content increased as the drought stress increased, maximum （HS） increase of 51.41%than the minimum （CK）;IAA and ZR content decreased with drought stress increased, the maximum values were 99.49 ng·g-1·FW-1 and 8.89 ng·g-1·FW-1, it was decreased by 23.88%and 47.50%compared to the control;GA content increased under light drought and decreased under heavy drought, the minimum value （HS） decrease of 51.41% than the maximum value （LS）. The endogenous hormone content was reached significant differences between different treatments. ③ The ratios of IAA/ABA, GA/ABA, ZR/ABA and ZR/IAA decreased as the drought stress increased, the minimum values were decreased by 46.68%, 65.33%, 65.34 and 34.93%compared to the control. Drought had significant impact on GA/ABA and ZR/ABA ratios, but insignificant impact on ZR/IAA ratio. GA/IAA ratio increased under light drought while decreasing under heavy drought. ④ The trends of growth characteristics indicated seedlings can adapt to drought by reducing the height and leaf area. The changes of endogenous hormone content illustrated seedlings can response to external drought stress through regulating their hormone levels. Severe drought stress has severely limited seedling growth which indicated that drought tolerance of Dalbergia odorifera seedlings was limited.