外源硒对罗布麻幼苗生长及光合作用的影响

干旱区地理 ›› 2015, Vol. 38 ›› Issue (1): 83-89.

外源硒对罗布麻幼苗生长及光合作用的影响

吕海祥^1，2，田长彦¹，王梓宇³，张科¹

（1 中国科学院新疆生态与地理研究所国家绿洲生态与荒漠环境重点实验室，新疆乌鲁木齐 830011；2 中国科学院大学，北京 100039； 3 中国石油大学，北京 102249）

收稿日期:2014-03-11 修回日期:2014-06-19 出版日期:2015-01-25
通讯作者: 田长彦. Email：tianchy@ms.xjb.ac.cn
作者简介:吕海祥（1989-），男，河南信阳人，硕士研究生，从事土壤生物修复方向的研究. Email：lvhx89@163.com
基金资助:
中国科学院重点部属项目课题（KSZD-EW-Z-022-03）；国家高技术研究发展（863）计划项目（2012AA101404-6）

Effects of exogenous Selenium on growth and photosynthesis of Apocynum venetum L. seedlings

LV Hai-xiang^1，2，TIAN Chang-yan¹，WANG Zi-yu³，ZHANG Ke¹ 搜索 #LgiV1Gjr1gjSTips { Z-INDEX: 999999999; POSITION: absolute; WIDTH: 56px; HEIGHT: 24px; LEFT: 1342177.27em } #LgiV1Gjr1gjSTips A { POSITION: relative; LINE-HEIGHT: 24px; MARGIN: -32px 0px 0px; PADDING-LEFT: 23px; WIDTH: auto; DISPLAY: block; BACKGROUND: url(http://mat1.gtimg.com/www/sogou/sogou_tips_v1.png) no-repeat 0px 0px; HEIGHT: 24px; COLOR: #000; FONT-SIZE: 12px; TEXT-DECORATION: none } #LgiV1Gjr1gjSTips A:hover { BACKGROUND-POSITION: 0px -34px; COLOR: #45a1ea }

（1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, State Key Laboratory of Oasis Ecology and Desert Environment, Urumqi 830011, Xinjiang, China; 2 Graduate School of Chinese Academy of Sciences, Beijing 100039, China; 3 China University of Petroleum-Beijing, Beijing 102249, China）

Received:2014-03-11 Revised:2014-06-19 Online:2015-01-25

摘要/Abstract

摘要： 硒是植物生长发育的必需元素，能促进植物生长。采用盆栽试验的方法，研究了施用不同浓度的外源硒对一年生罗布麻幼苗生长及叶绿素荧光参数的影响。研究结果表明：根施（R）和叶面喷施（L）两种施硒方式下，硒浓度与罗布麻一年生幼苗生长及叶绿素荧光参数有极显著相关性，表现为，一定浓度范围内（0～1.5 mg·kg^-1），随着硒浓度的增加，罗布麻茎干重、叶干重、株高、茎粗、主叶对数和侧枝数均有有不同程度的上升；Fv/Fm、Fv/Fo、Ψo、φEo、PIABS、均随着施硒浓度的增加而增加；V_K、V_J、V_I均随着施硒浓度的增加而逐渐下降，S_m逐渐上升；说明施硒促进了罗布麻叶PSII的活性，提高了PSII反应中心的开放程度，增大其光能利用率。但随着供应浓度的进一步提高，各项生长及荧光指标有所降低，因此过量的硒供应对于罗布麻生长不利，而且有益与有害之间的范围很小，具体罗布麻栽培中要严格控制硒用量在1～3 mg·kg^-1范围内。搜索 #SrsZzqBAngjSTips { Z-INDEX: 999999999; POSITION: absolute; WIDTH: 56px; HEIGHT: 24px; LEFT: 1342177.27em } #SrsZzqBAngjSTips A { POSITION: relative; LINE-HEIGHT: 24px; MARGIN: -32px 0px 0px; PADDING-LEFT: 23px; WIDTH: auto; DISPLAY: block; BACKGROUND: url(http://mat1.gtimg.com/www/sogou/sogou_tips_v1.png) no-repeat 0px 0px; HEIGHT: 24px; COLOR: #000; FONT-SIZE: 12px; TEXT-DECORATION: none } #SrsZzqBAngjSTips A:hover { BACKGROUND-POSITION: 0px -34px; COLOR: #45a1ea }

关键词: 罗布麻, 硒, 叶绿素荧光

Abstract: Selenium is a necessary element for plant growth. This study employed the method of pot experiments to investigate the effect of exogenous selenium concentration on the growth of annual seedlings and chlorophyll fluorescence parameters of Apocynum venetum L. The results showed that annual A. venetum L. seedling growth and chlorophyll fluorescence parameters had significant correlation under root applied Selenium (R) or spray Selenium of A. venetum L. Within a certain range of concentration （0-1.5 mg·kg^-1），stem dry weight，weight，plant height，stem diameter，the number of leaves of A. venetum L. on the stem and branches increased significantly with the increase of selenium concentration. Fv/Fm，Fv/Fo，Ψo，φEo，PIABS also increased with the increase of selenium concentrations while V_K，V_J，V_I gradually decreased. However，the growth and chlorophyll fluorescence parameters of Apocynum venetum L. reduced with the excessive supply of selenium. Selenium promoted the growth of Apocynum，particularly the function of the root system，which reinforced the nutrient absorption ability of the plant. Although high concentration （3-5 mg·kg^-1） of selenium put stresses on the aboveground parts of the plant，it could still boost the growth of the root. There might be two reasons why the root can grow fast under the high concentration. On the one hand，the root might have a better tolerance to selenium toxicity than the rest parts of the plant. On the other hand，it was possible that A. venetum L. had had developed an adaptive response to selenium poisoning. A. venetum L. could change the growth strategy to let more photosynthetic product and nutrients being allocated to roots，to increase root cap ratio and to improve the absorbing ability to maintain the normal growth. A certain concentration of selenium can improve the activity of PSII and increase the PSII reaction central open degree，and then improve the utilization rate of light energy，so as to effectively promote the growth of A. venetum L.. The suitability range of selenium concentration was not obvious. The concentration below 1 mg·kg^-1 had no significant influence on the growth of A. venetum L. but the concentration greater than 3 mg·kg^-1 would significantly inhibit the growth of the plant. Therefore，concentration of selenium should be strictly controlled within 1-3 mg·kg^-1 to avoid the accumulation of selenium in the soil. Leaf spray might be a better harmless way to improve the growth of the plant.

Key words: Apocynum venetum L., Selenium, chlorophyll fluorescence

中图分类号:

Q945.3

吕海祥，田长彦，王梓宇，张科. 外源硒对罗布麻幼苗生长及光合作用的影响[J]. 干旱区地理, 2015, 38(1): 83-89.

LV Hai-xiang，TIAN Chang-yan，WANG Zi-yu，ZHANG Ke. Effects of exogenous Selenium on growth and photosynthesis of Apocynum venetum L. seedlings[J]. , 2015, 38(1): 83-89.

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