作 者 ：经博翰1,袁龙义1,2*
期 刊 ：西北植物学报 2015年 2期 页码：344~349
Keywords:Honghu Lake, submerged macrophytes, quantum yield, rapid light curve,
摘 要 ：利用水下饱和脉冲荧光仪(DIVING-PAM),原位观测洪湖5种优势沉水植物——苦草[Vallisneria natans (Lour.) Hara]、黑藻[Hydrilla verticillata (L.f.) Royle]、狐尾藻(Myriophyllum verticillatum L.)、菹草(Potamogeton crispus L.)和马来眼子菜(Potamogeton wrightii Morong)的量子产量及快速光曲线。结果显示:5种沉水植物苦草、黑藻、狐尾藻、菹草和马来眼子菜最大量子产量(Fv/Fm)分别为0.603、0.723、0.751、0.778和0.646。各物种的开放PSⅡ反应中心原初光能捕获效率(Fv′/Fm′)的大小依次为菹草＞狐尾藻＞黑藻＞马来眼子菜＞苦草,且除黑藻与狐尾藻间差异不显著外,其他物种间差异均显著;各物种光能利用能力(α)的大小依次为菹草＞黑藻＞狐尾藻＞马来眼子菜＞苦草,且除黑藻与狐尾藻间差异不显著外,其他物种间差异均显著;各物种无光抑制的最大潜在相对电子传递速率(rETRm)的大小依次为菹草＞狐尾藻＞黑藻＞马来眼子菜＞苦草,且各物种间差异显著;半饱和光强(Ek)的大小依次为狐尾藻＞菹草＞黑藻＞苦草＞马来眼子菜,且除狐尾藻与菹草间差异不显著外,其他物种间差异均显著。研究表明:洪湖5种优势沉水植物中,菹草和狐尾藻较耐强光,光合速率较高,而苦草则有较强的耐弱光能力。
Abstract:Five dominant submerged macrophytes commonly found in Honghu Lake were collected,including Vallisneria natans (Lour.) Hara,Hydrilla verticillata (L.f.) Royle,Myriophyllum verticillatum L.,Potamogeton crispus L.and Potamogeton wrightii Morong.Their maximal quantum yields of photosystem Ⅱ(Fv/Fm) as well as rapid light curves(RLCs) were measured in situ by using pulse-amplitude modulated fluorometer(Diving-PAM).The results showed that:The measured maximal quantum yields of V.natans (Lour.) Hara,H.verticillata (L.f.) Royle,M.verticillatum L.,P.crispus L.and P.wrightii Morong were 0.603,0.723,0.751,0.778 and 0.646,respectively.All the five species’s Fv′/Fm′ from high to low order as P.crispus L.＞M.verticillatum L.＞H.verticillata (L.f.) Royle＞P.wrightii Morong＞V.natans (Lour.) Hara.In addition,there was nosignificant difference between H.verticillata (L.f.) Royle and M.verticillatum L.,all other species display statistically significant differences;All the five species’s α from high to low order as P.crispus L.＞H.verticillata (L.f.) Royle＞M.verticillatum L.＞P.wrightii Morong＞V.natans (Lour.) Hara.In addition,there was nosignificant difference between H.verticillata (L.f.) Royle and M.verticillatum L.,while all other species display statistically significant differences.All the five species’s rETRm from high to low order as P.crispus L.＞M.verticillatum L.＞H.verticillata (L.f.) Royle＞P.wrightii Morong＞V.natans (Lour.) Hara,and all the five species display statistically significant differences;All the five species’s Ek from high to low as M.verticillatum L.＞P.crispus L.＞H.verticillata (L.f.) Royle＞V.natans (Lour.) Hara＞P.wrightii Morong.In addition,there was nosignificant difference between P.crispus L.and M.verticillatum L.,all other species display statistically significant differences.Studies have shown that P.crispus L.and M.verticillatum L.have higher light resistance capacity as well as faster photosynthetic rate,and V.natans (Lour.) Hara has lower light resistance capacity among the five dominant submerged macrophytes commonly in Honghu Lake.