摘要
为探明芒萁对酸铝胁迫的耐性机制,以玉米为对照,采用水培法研究了低pH值(3.5、4.5、5.5)和铝胁迫(0、50、100、400μmol/L)对芒萁和玉米幼苗生长、叶绿素含量、光合特性(净光合速率、气孔导度、胞间CO_2浓度、蒸腾速率)和叶绿素荧光参数[最大光化学效率(F_v/F_m)、光化学猝灭系数(qP)、非光化学猝灭系数(NPQ)]的影响。结果表明,在不加铝条件下,随着pH值下降,芒萁生物量、叶绿素含量、光合特性和叶绿素荧光参数总体均无明显变化,而玉米生物量、叶绿素含量、净光合速率、气孔导度和qP明显下降,胞间CO_2浓度明显升高。在相同pH值条件下,随铝浓度增加,芒萁和玉米生物量、叶绿素含量、净光合速率、气孔导度、蒸腾速率、F_v/F_m和qP均逐渐下降,但玉米下降幅度远大于芒萁。芒萁和玉米NPQ随铝浓度的增加而升高,但升高幅度表现为芒萁大于玉米。此外,随铝浓度的增加,芒萁胞间CO_2浓度逐渐下降,玉米则逐渐升高;芒萁叶片水分利用效率先升高后降低,玉米则总体逐渐下降。综上,芒萁耐酸和耐铝能力强于玉米,铝对植物的毒害作用大于pH值,但低pH值会加剧铝毒害效应。
Dicranopteris dichotoma and Zea mays were used to study the effects of different solution p H values( 3. 5,4. 5,5. 5) and aluminum( Al) concentrations( 0,50,100,400 μmol / L) on plant growth,chlorophyll content,photosynthetic characteristics( net photosynthetic rate,stomatal conductance,intercellular CO_2 concentration,transpiration rate) and chlorophyll fluorescence parameters[maximal photochemical efficiency( Fv/ Fm),coefficient of photochemical quenching( q P),coefficient of photochemical non-quenching( NPQ) ] with solution culture method,so as to find out photosynthetic and fluorescent resistant mechanisms under acid and Al stresses in Dicranopteris dichotoma. The results showed that when the solution p H value decreased from 5. 5 to 3. 5 without Al addition,plant biomass,chlorophyll content,photosynthetic characteristics and chlorophyll fluorescence parameters in Dicranopteris dichotoma were not obviously changed; while plant biomass,chlorophyll content,net photosynthetic rate,stomatal conductance and q P were decreased obviously,and stomatal conductance was increased obviously in Zea mays. Under the condition of the same p H value,with the increase of Al concentrations,plantbiomass,chlorophyll content,net photosynthetic rate,stomatal conductance,transpiration rate,Fv/ Fmand q P were decreased gradually in both Zea mays and Dicranopteris dichotoma,but the magnitude of decrease was higher in Zea mays than that in Dicranopteris dichotoma. NPQ was increased with the increase of Al concentration in both Zea mays and Dicranopteris dichotoma,especially in Dicranopteris dichotoma.Meanwhile,with the increase of Al concentration,intercellular CO_2 concentration was reduced gradually in Dicranopteris dichotoma,and increased gradually in Zea mays; the water use efficiency first increased and then decreased in Dicranopteris dichotoma,and reduced gradually in Zea mays. These results indicated that Dicranopteris dichotoma was much more tolerant to acid and Al stresses than Zea mays,and the effects of Al toxicity were mor
出处
《河南农业科学》
CSCD
北大核心
2016年第11期58-64,共7页
Journal of Henan Agricultural Sciences
基金
国家自然科学基金项目(31260498)
江西省自然科学基金项目(2010GQN0122)
江西省教育厅科技项目(GJJ12466)
关键词
酸胁迫
铝胁迫
芒萁
玉米
光合特性
叶绿素荧光参数
acid stress
aluminum stress
Dicranopteris dichotoma
Zea mays
photosynthetic character istics
chlorophyll fluorescence parameters
