摘要
为研究引种小灌木在干旱胁迫下的生理光合特性,以1a生华北驼绒藜、四翅滨藜2种扦插苗为试验材料,研究土壤水分[土壤水分为田间持水量的85%~90%(CK)、65%~70%(T_1)、50%~55%(T_2)和35%~40%(T_3)]对2种灌木光合生理指标的影响。结果表明:随着水分胁迫程度的增加,2种灌木根冠比、电解质外渗率呈现CK<T_1<T_2<T_3的变化规律;丙二醛质量摩尔浓度与CK相比,各水平下均显著增加,且都在T_2水平下达最大;过氧化物酶活性在T_1水平下达到最大,分别为340.83U·mg^(-1)·min^(-1)、862.93U·mg^(-1)·min^(-1);在T_2水平下,四翅滨藜脯氨酸质量分数较CK增加28倍;华北驼绒藜叶片蒸腾速率(T_r)、净光合速率(P_n)均呈现出CK>T_1>T_2>T_3的变化特征;在T_1水平下,四翅滨藜叶绿体色素(叶绿素a、叶绿素b及类胡萝卜素)增加,光合能力增强。
To study two introduced small shrubs under drought stress physiological and photosynthetic characteristics,1 a-aged cutting seedlings of Ceratoides arborescens and Atriplex canescens were served as testing materials,setting soil moisture as 85 %-90 % （CK）,65 %-70 % （T1） and 50 %-55 % （T2） and 35 %-40 % （T3） of field capacity,to study the effect of soil moisture on photosynthetic and physiological indexes of shrubs.The results showed that：with the increase of water stress,the root shoot ratio and membrane permeability rate of two shrub varied as CK〈T1 〈T2〈T3;the molality of MDA in three levels of drought stress was significantly increased （P〈0.05） compared with CK,and the maximum values reached at T2 level in two shrubs;POD activities reached the maximum at T1 level,and 340.83 U · mg-1 · min-1 for Ceratoides arborescens and 862.93 U · mg 1 · min 1 for Atripleax canescens;compared with CK,the mass fraction of Pro increased by 28 times at the T2 level in Atriplex canescens;the leaf transpiration rate Tr and net photosynthetic rate （Pn） of Ceratoides arborescens changed in the sequence of CK〉Tl〉T2〉T3;in the level of T1,chloroplast pigments （chlorophyll a,chlorophyll b and carotenoids） increased,and photosynthetic capacity was enhanced in Atriplex canescens.
出处
《西北农业学报》
CAS
CSCD
北大核心
2017年第5期790-796,共7页
Acta Agriculturae Boreali-occidentalis Sinica
基金
"十二五"国家科技支撑计划(2015BAC01B01)
宁夏科技支撑计划重点项目(2012ZZS50)
宁夏国际合作项目(2012ZYH169)
宁夏农林科学院科技创新先导资金项目(NKYG-14-09)~~
关键词
华北驼绒藜
四翅滨藜
干旱胁迫
光合作用
叶绿素
生理特性
Ceratoides arborescens
Atriplex canescens
Drought stress
Photosynthesis
Chlorophyll
Physiological characteristics
