摘要
为筛选出抗旱性强的藤本植物,以络石、常春油麻藤、扶芳藤、常春藤、金银花、绿爬山虎6种藤本植物的一年生扦插苗为试材,研究干旱胁迫对6种藤本植物光合作用及叶绿素荧光参数的影响,比较分析6种藤本植物的抗旱性。结果表明：随着干旱胁迫的加重,叶绿素相对含量、净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、光饱和点（LSP）、光补偿点（LCP）、最大光化学效率（Fv/Fm）、电子传递速率（ETR）及光化学猝灭系数（qp）均下降,水分利用效率（WUE）及初始荧光（Fo）提高;在轻度干旱（LS,土壤含水量为田间持水量的75%-70%）下,金银花的净光合速率（Pn）高于其他5种藤本植物,常春藤的净光合速率（Pn）低于其他5种藤本植物;在重度干旱（SS,土壤含水量为田间持水量的35%-30%）下,络石的水分利用效率最高,为7.96μmol/（m^2·s）,绿爬山虎的水分利用效率最低,为3.82μmol/（m^2·s）。从光合作用及叶绿素荧光参数等指标综合分析,抗旱性由强到弱的植物依次为络石、常春油麻藤、扶芳藤、常春藤、金银花、绿爬山虎。
The effects of drought stress on photosynthesis and chlorophyll fluorescence parameters of six kinds of lianas（including Trachelospermum jasminoides, Mucuna sempervirens, Euonymus fortunei, Hedera nepalensis, Lonicera japonica, Parthenocissus laetevirens） were studied to compare their drought tolerance and to screen out drought-resistant plant by using their one-year-old cuttage seedlings. The results showed that the relative chlorophyll content, net photosynthetic rates（Pn）, stomatal conductances（Gs）, transpiration rates（Tr）, light saturation point（LSP）, light compensation point（LCP）, maximal photochemical efficiency（Fv/Fm）, electron transfer rates（ETR） and photochemical quenching coefficient（qp） were all decreased, while, water use efficiency（WUE） and initial fluorescence（Fo） were increased. The net photosynthetic rate of lonicera japonica was higher than that of the other five kinds of lianas, while, Hedera nepalensis was lower than the other five kinds of lianas in light drought stress（soil moisture was 75%–70% of maximum field moisture capacity）. In severe drought stress（soil moisture was 35%–30% of maximum field moisture capacity）, the water use efficiency of Trachelospermum jasminoides was the highest, with a value of 7.96 μmol/（m^2·s）, and that of Parthenocissus laetevirens was the lowest, with the value of 3.82 μmol/（m^2·s）. From the comprehensive analysis of these photosynthetic characteristics and chlorophyll fluorescence parameters, it was concluded that the drought-resistant ability of six kinds of lianas decreased as follow in turn： Trachelospermum jasminoides, Mucuna sempervirens, Euonymus fortunei, Hedera nepalensis, Lonicera japonica, Parthenocissus laetevirens.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第3期263-270,共8页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省科技计划重点项目(2012FJ4565)
湖南生物机电职业技术学院青年基金项目(13QN25)
关键词
藤本植物
干旱胁迫
光合特性
叶绿素荧光
lianas drought stress photosynthetic characteristics chlorophyll fluorescence
