%0 Journal Article
%T Effects of silicon on photosynthetic characteristics of Indocalamus barbatus under simulated acid rain stress.<br>模拟酸雨胁迫下硅对髯毛箬竹光合特性的影响
%A XIE Yin-feng
%A YANG Wan-hong
%A LU Mei-rong
%A CAI Xian-lei
%A ZHOU Jian
%A <br>谢寅峰
%A 杨万红
%A 陆美蓉
%A 蔡贤雷
%A 周坚
%J 应用生态学报
%D 2008
%I 
%X With Indocalamus barbatus as test material, the effects of silicon on the relative content of chlorophyll, diurnal variations of photosynthesis, and chlorophyll fluorescence were examined under simulated acid rain (pH 3.0) stress. The results showed that under acid rain stress, 20 and 500 mg x L(-1) of Na2SiO3 could prohibit the decrease of the relative content of chlorophyll to some extent; 100 mg x L(-1) of Na2SiO3 could get best effect, with the relative chlorophyll content being 22.7% higher than the control; while 500 mg x L(-1) of Na2SiO3 didn't have any effect. Under the stress, the midday depression of photosynthesis became more serious. The average daily net photosynthetic rate (Pn), stomatal limitation value (Ls), and stomata conductance (Gs) were all decreased significantly, while the intercellular CO2 concentration (Ci) increased. After treated with 20-100 mg x L(-1) of Na2SiO3, the Pn, Ls, and Gs increased to some extent while Ci decreased, and 100 mg x L(-1) of Na2SiO3 was most effective, with the average daily Pn increased by 39.2%. The maximum fluorescence of dark adaptation (Fm), maximal photochemical efficiency (Fv/Fm), potential activity (Fv/Fo), effective photochemical efficiency (Fv'/Fm'), maximum fluorescence of light adaptation (Fm') of PSII, photochemical quenching (qp), non-photochemical quenching (qN), and actual photochemical efficiency of PSII (PhiPSII) were all decreased obviously under simulated acid rain stress, but the minimum fluorescence of dark adaptation (Fo) and the minimum fluorescence of light adaptation (Fo') increased. 100 mg x L(-1) of Na2SiO3 could restrain the changes of fluorescence parameters obviously, with the Fv/Fm, Fv/Fo, Fv'/Fm' and PhiPSII increased by 35.2%, 146.2%, 55.0% and 24.3%, respectively, compared with the control. It was suggested that applying appropriate concentration of exogenous silicon to I. barbatus could efficiently relieve the decrease of its photosynthetic activity and the damage of its photosynthetic system caused by acid rain, and thus, improve its photosynthetic ability under the stress.
%K 模拟酸雨
%K 硅
%K 髯毛箬竹
%K 光合作用
%K 叶绿素荧光
%K 模拟酸雨胁迫
%K 箬竹
%K 光合特性
%K 影响
%K acid
%K rain
%K stress
%K simulated
%K photosynthetic
%K characteristics
%K silicon
%K 光合能力
%K 植物
%K 损伤
%K 光合系统
%K 活性下降
%K 适宜浓度
%K 变化
%K 荧光参数
%K 最小
%K 光适应
%K 非光化学淬灭
%K 系数
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=DBD7514A2D7B01687F73D9C962B41759&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=B31275AF3241DB2D&sid=4206C58D935377EA&eid=01A9864A3FFB986F&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=28