|本期目录/Table of Contents|

[1]商天其 孙志鸿**.香樟幼龄林不同叶龄叶片的光合特征和单萜释放规律[J].应用与环境生物学报,2019,25(01):1-13.[doi:10.19675/j.cnki.1006-687x.2018.04023]
 SHANG Tianqi & SUN Zhihong **.Photosynthetic characteristics and monoterpenes emission related in foliage-ontogeny in Cinnamomum camphora[J].Chinese Journal of Applied & Environmental Biology,2019,25(01):1-13.[doi:10.19675/j.cnki.1006-687x.2018.04023]
点击复制

香樟幼龄林不同叶龄叶片的光合特征和单萜释放规律()
分享到:

《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年01期
页码:
1-13
栏目:
研究论文
出版日期:
2019-02-25

文章信息/Info

Title:
Photosynthetic characteristics and monoterpenes emission related in foliage-ontogeny in Cinnamomum camphora
文章编号:
201804023
作者:
商天其 孙志鸿**
浙江农林大学林业与生物技术学院 临安 311300
Author(s):
SHANG Tianqi & SUN Zhihong **
Zhejiang Agriculture and Forestry University, Institute of Forestry and Biotechnology , Linan 311300, China
关键词:
非直角双曲线模型Farquhar模型光合电子传递CO2羧化速率BVOCs排放园林植物
Keywords:
Non-rectangular hyperbola model Farquhar model Photosynthetic electron transport Carbon dioxide carboxylation efficiency BVOCs emissions Landscape plants
DOI:
10.19675/j.cnki.1006-687x.2018.04023
摘要:
植物挥发性有机化合物(Plant Biogenic volatile organic compounds, BVOCs)作为植物与周围环境交流的主要介质,对植物生理活动和大气环境变化都具有重要影响。香樟(Cinnamomum camphora)作为一种广泛分布于亚热带地区的重要树种,释放多种包括单萜类的BVOCs,但是其单萜释放的基本规律和特征参数的研究还存在空白。本研究通过调查香樟叶片生长发育中幼龄、成熟和老龄三个阶段的光合生理与单萜释放规律,研究了光合光电子输运、CO2固定对单萜释放的影响和调控规律。光合生理特征参数调查采用非直角双曲线模型和Farquhar模型,单萜释放特征参数调查采用Guenther BVOCs排放模型。结果显示:(1) 香樟叶片释放的单萜以蒈烯和罗勒烯为主。在本试验的基础状态下(温度25℃,光照强度800μmol·m-2·s-1 和CO2浓度400ppm),净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和胞间CO2浓度(Ci)大小规律为成熟叶> 幼龄叶>衰老叶,总单萜释放速率(E)为幼龄叶>衰老叶>成熟叶。(2)叶片三个叶龄阶段的单萜-光响应曲线变化趋势与光合的光响应曲线类似,但受CO2浓度的影响不明显。成熟叶具有最高的初始量子效率(α)、最大净光合速率(Pnmax)、Rubiscom酶最大羧化速率(Vcmax)、光下呼吸速率(Rp)和光饱和点(LSP),但是幼龄叶的光补偿点(LCP)、暗呼吸速率(Rd)和响应曲线的曲角系数(θ)最大。衰老叶具有最高的最大电子传递速率(Jmax)和最低Vcmax,因此其Jmax/Vcmax比率为三个阶段最高,意味着衰老叶光能利用率最低,强光下光能过剩,这很可能也是常绿植物冬天利用过剩光能保持一定温度越冬的一个调控机制。(3)幼龄叶的最大单萜排放速率(Emax)最大,其次为衰老叶,成熟叶最小。在三个阶段中,成熟叶的表观量子效率(β)和真实量子效率(βT)均是最大,幼龄叶的β最小,但βT却仅次于成熟叶。综上所述,香樟叶片单萜的释放受叶片叶龄的不同影响显著,具有显著的光依赖特性,对CO2浓度的响应不明显。香樟叶片单萜释放水平很可能受自身生长过程中能量和碳源供应的调控,也受不同生长季节环境因子变化的影响,可为区域性BVOCs释放模型提供有益的参数借鉴。
Abstract:
Plant Biogenic volatile organic compounds (BVOCs) emission is driven by environmental factors and ontogeny stages. Cinnamomum camphora as an evergreen tree species widely distributed and used as urban greening in south of China , emits multiple BVOCs emission involves monoterpenes. However the regulation of how the effects of photosynthetic physiology on monoterpene emissions is known poorly. In this study, we investigated C. camphora photosynthetic characteristics monoterpenes emission under young, mature and old three foliar ontogeny stages to insight into whether exist the directly regulation relationship between monoterpenes emission and photosynthetic CO2 assimilation. Photosynthetic characteristic was estimated with light/CO 2 response curve by using Non-rectangular hyperbola and Farquhar photosynthesis model. Total monoterpenes emission parameters were estimated by using Guenther BVOCs emission model. Mainly monoterpenes from C. camphora were careen and ocimene . The parameters of net photosynthesis rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and intercellular CO2 concentration ( Ci) in three foliar ontogeny stages were significant different measured under standard conditions, and highest and lowest were found in mature and old foliage respectively. However highest total monoterpenes emission rate ( E) were found in young foliage, and the lowest emission rate in mature foliage . The response tendency of total monoterpenes emission with light intensity was similar to photosynthesis-light intensity response curves under three foliar ontogeny stages, while the response to CO2 concentration were no significant impacts on total monoterpenes emission. Mature foliage had highest initial quantum efficiency ( α), maximum net photosynthetic rate (Pnmax), maximum carboxylase activity of Rubisco (Vcmax), respiration rate under light (Rp) and light saturation point (LSP). While the highest value for light compensation poin (LCP) and dark respiration rate (Rd) were found in young foliage. The highest value for capacity of photosynthetic electron transport (Jmax) and lowest value for capacity of V cmax were found in old foliage . This meant that old foliage had the lowest light energ y utilization and there was excess light energy under strong light, which was probably also a regulatory mechanism for the evergreen plants to use excess light energy to maintain a certain temperature to overwinter . The highest maximum monoterpenes emission rate ( Emax) and lowest apparent quantum efficiency(β) for total monoterpenes emission were found in young foliage, however, lowest Emax and highest apparent quantum efficiency (β) and true quantum yield (βT) and for total monoterpenes emission were found in mature foliage. We conclude that m onoterpenes emission from C. camphora is mainly depended on foliage-ontogeny, though its emission rate had significantly light response , but not CO2 concentration, indicating the total monoterpene emission could be regulated by the energy and carbon source supply during the growth process, and also influenced by the changes of environmental factors in different seasons. This study will be useful to contribution the precise emission parameters for regional model in BVOCs emission estimation.

备注/Memo

备注/Memo:
收稿日期: 2018-04-20 接受日期 Accepted: 2018-05-24
*浙江农林大学科研发展基金项目(2014FR087)和浙江省科技计划项目(2016C32018)资助?
**通讯作者(E-mail: sunzh656@163.com)
点击摘要页题目后的“PDF”可下载阅读全文;本文为已录用的作者修定稿,尚未经编辑全面修改。
引用本文请注明出处本刊;发表刊期和页码将以正式出版时的安排为准,但DOI确定不变。
更新日期/Last Update: 2018-07-13