作 者：
梁芳;卜小英;黄秋伟;龙凌云;毛立彦;檀小辉
单 位：
广西壮族自治区亚热带作物研究所;玉林师范学院;北海宏恒工程项目管理咨询有限公司
关键词：
潮汐系统;红花玉蕊;不同水位;淹水胁迫;生理特性
摘 要：
为揭示淹水胁迫对淡水红树植物红花玉蕊的生长及生理特性的影响,获得红花玉蕊在10‰盐水淹浸时适生的水位范围。模拟半日潮,每天在温室分别以不同水位(不淹、淹浸至地径、淹浸至枝下高、全淹)对2年生红花玉蕊实生苗进行不同水位淹浸胁迫处理6h,以不淹为对照(CK),处理后每7d调查各处理幼苗的形态指标,第10天取样测定各处理的超氧化物歧化酶(SOD)、过氧化物酶(POD)活性、丙二醛(MDA)和脯氨酸(Pro)含量,综合分析红花玉蕊的耐水淹能力。结果表明,10‰盐水淹浸幼苗10d后,红花玉蕊幼苗无死亡株,幼苗株高及地径均有所增长,淹浸至地茎、枝下高2种水位均对株高、地径、叶片的生长起促进作用,全淹时均有所抑制,不利于幼苗正常生长。在生理指标上,随着淹浸水位的不断升高,幼苗叶片的SOD酶活性逐渐增高,全淹较对照呈显著差异(P<0.05);POD酶活和丙二醛含量均是先升高后降低,脯氨酸含量先降低后急剧升高,全淹较CK呈极显著差异(P<0.01)。综合分析得知,适当水位的盐水淹浸有利于红花玉蕊的生长,其在10‰盐水淹浸胁迫下主要通过快速增加脯氨酸含量来维持细胞正常的渗透压,同时启动SOD酶、POD酶以清除活性氧对植株的损伤,而后开始适应外界淹水环境。红花玉蕊幼苗在10‰盐水环境下最佳淹水水位为淹浸至地径,适生水位范围是不淹至枝下高。
译 名：
Effects of Flooding on the Growth and Physiological Characteristics of Barringtonia acutangula
作 者：
LIANG Fang;BU Xiao-ying;HUANG Qiu-wei;LONG Ling-yun;MAO Li-yan;TAN Xiao-hui;Yulin Normal University;Beihai Hongheng Project Management Consulting Co.,Ltd.;Guangxi Subtropical Crops Research Institute;
单 位：
LIANG Fang%BU Xiao-ying%HUANG Qiu-wei%LONG Ling-yun%MAO Li-yan%TAN Xiao-hui%Yulin Normal University%Beihai Hongheng Project Management Consulting Co.,Ltd.%Guangxi Subtropical Crops Research Institute
关键词：
tidal system;;Barringtonia acutangula;;different water level;;flooding stress;;physiological characteristics
摘 要：
To reveal the effects of flooding stress on the growth and physiological characteristics of the freshwater mangrove Barringtonia acutangula,and to obtain a suitable water level range for the plant growth under 10‰salt water immersion.The half-day tide was simulated,and the two-year-old B.acutangulaseedlings were treated with different water levels in the greenhouse(no flooding,flooding to the basal stem,flooding to the under branch height,and full flooding)for 6 h,no flooding was taken as the control.The morphological indexes of each treated seedlings were investigated every 7 days after the treatment,and the superoxide dismutase(SOD)and peroxidase(POD)activities of each treatment were measured on the10 th day of the treatment.The contents of malondialdehyde(MDA)and proline(Pro)were comprehensively analyzed for the water-resistant ability of B.acutangula.After 10 days of flooding with 10‰ salt water with different levels,no dead seedlings were found.The plant height and ground diameter of all the flooding treatments increased.Two water levels(flooding to the basal stem,and to the under branch height)promoted the growth of seedling height,ground diameter and the leaves.Full flooding treatment however,inhibited the growth,which was not conducive to the normal growth of the seedlings.On the physiological indexes,with the increase of water level,the SOD activity of the seedling leaves increased gradually,and the full flooding was significantly different from the control(P<0.05).The POD activity and the malondialdehyde content increased first,and then decreased.The proline content decreased first and then increased sharply.The full flooding was significantly different from the control(P<0.01).Comprehensive analysis showed that 10‰salt water immersion at appropriate water level was beneficial to the growth of B.acutangula,which maintained normal osmotic pressure by rapidly increasing proline content,and activated SOD and POD enzymes to remove the damage of reactive oxygen species to plant,and then began to adapt to the external flooding environment.Under 10‰salt water environment,the optimum flooding water level for B.acutangula was flooding to the basal stem,and the optimum water level suitable for the growth was flooding to the stem height below branches.
