Comparative Paraquat Sensitivity of Newly Germinated and Mature Fronds of the Aquatic Macrophyte <i>Spirodela polyrhiza</i>  

作　　者：Jihae Park Hojun Lee Taejun Han Jihae Park;Hojun Lee;Taejun Han(Lab of Plant Growth Analysis, Ghent University Global Campus, Incheon, Republic of Korea;Department of Marine Science, Incheon National University, Incheon, Republic of Korea)

机构地区：[1]Lab of Plant Growth Analysis, Ghent University Global Campus, Incheon, Republic of Korea [2]Department of Marine Science, Incheon National University, Incheon, Republic of Korea

出　　处：《American Journal of Plant Sciences》2020年第7期1008-1024,共17页美国植物学期刊（英文）

摘　　要：Here, we compared the intrinsic characteristics of 3-day-(newly germinated;<span><span style="font-family:Verdana;">“young”) and 8-week-old (“mature”) fronds of the aquatic plant </span><i><span style="font-family:Verdana;">Spirodela</span></i><span style="font-family:Verdana;"> <i>polyrhiza</i></span> </span><span style="font-family:Verdana;">and their sensitivity to paraquat, a toxic herbicide. Endpoints measured were frond area and fresh weight, root length, chlorophyll</span><i><span style="font-family:Verdana;"> a</span></i><span style="font-family:Verdana;"> and</span><i><span style="font-family:Verdana;"> b </span></i><span style="font-family:Verdana;">contents, and chlorophyll</span><i><span style="font-family:Verdana;"> a</span></i><span style="font-family:Verdana;"> fluorescence. Significant differences were detected in the intrinsic physiological traits between young and mature fronds. Young fronds showed higher root length, chlorophyll contents, maximum quantum yield (</span><i><span style="font-family:Verdana;">F</span>_{<span style="font-family:Verdana;">v</span>}</i><span style="font-family:Verdana;">/</span><i><span style="font-family:Verdana;">F</span>_{<span style="font-family:Verdana;">m</span>}</i><span style="font-family:Verdana;">), maximal relative electron transport rate (rETR</span>_{<span style="font-family:Verdana;">max</span>}<span style="font-family:Verdana;">) and saturating photon flux density (PFD), whereas mature fronds exhibited greater frond area and fresh weight. After a 72 h exposure to paraquat, root length and rETR</span>_{<span style="font-family:Verdana;">max</span>}<span style="font-family:Verdana;"> were identified as the most sensitive endpoints of paraquat toxicity for both frond types, with EC</span>_{<span style="font-family:Verdana;">50</span>}<span style="font-family:Verdana;"> values of 0.66 and 0.76 μg<span style="font-size:6.5pt;font-family:"background:yellow;">&middot;</span>L</span><sup><span style="font-family:Here, we compared the intrinsic characteristics of 3-day-(newly germinated;<span><span style="font-family:Verdana;">“young”) and 8-week-old (“mature”) fronds of the aquatic plant </span><i><span style="font-family:Verdana;">Spirodela</span></i><span style="font-family:Verdana;"> <i>polyrhiza</i></span> </span><span style="font-family:Verdana;">and their sensitivity to paraquat, a toxic herbicide. Endpoints measured were frond area and fresh weight, root length, chlorophyll</span><i><span style="font-family:Verdana;"> a</span></i><span style="font-family:Verdana;"> and</span><i><span style="font-family:Verdana;"> b </span></i><span style="font-family:Verdana;">contents, and chlorophyll</span><i><span style="font-family:Verdana;"> a</span></i><span style="font-family:Verdana;"> fluorescence. Significant differences were detected in the intrinsic physiological traits between young and mature fronds. Young fronds showed higher root length, chlorophyll contents, maximum quantum yield (</span><i><span style="font-family:Verdana;">F</span>_{<span style="font-family:Verdana;">v</span>}</i><span style="font-family:Verdana;">/</span><i><span style="font-family:Verdana;">F</span>_{<span style="font-family:Verdana;">m</span>}</i><span style="font-family:Verdana;">), maximal relative electron transport rate (rETR</span>_{<span style="font-family:Verdana;">max</span>}<span style="font-family:Verdana;">) and saturating photon flux density (PFD), whereas mature fronds exhibited greater frond area and fresh weight. After a 72 h exposure to paraquat, root length and rETR</span>_{<span style="font-family:Verdana;">max</span>}<span style="font-family:Verdana;"> were identified as the most sensitive endpoints of paraquat toxicity for both frond types, with EC</span>_{<span style="font-family:Verdana;">50</span>}<span style="font-family:Verdana;"> values of 0.66 and 0.76 μg<span style="font-size:6.5pt;font-family:"background:yellow;">&middot;</span>L</span><sup><span style="font-family:

关 键 词：Spirodela polyrhiza PARAQUAT HERBICIDE Chlorophyll Contents Chlorophyll a Fluorescence Root Length 

分 类 号：O17[理学—数学]