盐胁迫对空心莲子草生长和光合作用的影响（完整版）实用资料(可以直接使用，可编辑完整版实用资料，欢迎下载）刘爱荣,张远兵,陈庆榆,张丛宇,熊周林,何庆元,王桂芹(安徽科技学院生命科学院,安徽蚌埠233100摘要:用NaCl浓度为0(对照、50、100、150、200、250、300心莲子草[Alternantheraphiloxeroides(Mart.Griseb]。结果表明:盐胁迫下,植株鲜重、干重和根冠比都下降,含水量和肉质化程度先略高于对照,而后逐渐下降;根、茎和叶中Na+含量呈上升趋势,而K+含量呈下降趋势,且在同一浓度的盐处理下,叶的Na+和K+含量最高,茎的次之,根的最低;游离氨基酸(freeaminoacid,FAA逐渐减少,脯氨酸(proline,Pro含量先略低于对照,而后则急剧上升,可溶性糖含量(solublesugar,SS的变化正相反;净光合速率(netphotosyntheticrate,Pn、气孔导度(stomatalconductance,Gs和蒸腾速率(transpirationrate,Tr呈下降趋势,胞间CO2浓度(intercellularCO2concentration,Ci呈上升趋势;膜稳定性呈下降趋势。因此,空心莲子草是一种盐生植物,且最适盐浓度较低;Na+主要积累在地上部的茎和叶中。推测它有可能向盐渍土壤蔓延。关键词:空心莲子草;盐胁迫;生长;净光合速率;含水量;膜透性中图分类号:Q945文献标识码:A文章编号:0253-2700(200701-085-06LIUAi-Rong,ZHANGYuan-Bing,CHENQing-Yu,ZHANGCong-Yu,XIONGZhou-Lin,HEQing-Yuan,WANGGui-Qin(LifeScienceCollege,AnhuiScienceandTechnologyUniversity,Benbu233100,ChinaAlternantheraphiloxeroideswastreatedwithNaClofdifferentconcentrations(0,50,100,150,200,250,300andTheresultsshowed:(1UnderNaCltreatment,thefreshweight,thedryweightandtherootshootratiodecreased.(2Watercontentandthesucculencydegreeofwholeplantappearedtoincreasefirstandthengraduallydeclineassalinityincreased.(3Na+contentsincreasedandK+contentsdecreasedinroot,stemandleaf.Na+andK+contentsinleafwerethehighestunderthesamesalinity,thoseinstemwerenextandthoseinrootwerethelowest.(4FAAcontentgraduallydecreased.(5Procontentappearedtodeclinefirstandthenincreaseassalinityin-creased.(6Solublesugarchangedintheoppositedirection.(7Pn,GsandTrdecreasedandCiincreased.Therelativeconductivityofleavesincreasedsignificantly.(8Themalondialdehyde(MDAcontentdeclinedataboutNaClataboutNaCl100-350ThoseparametersindicatedthatA.philoxeroideswashalophyte,butitssalttolerancewasnotstronganditsNaCloptimalconcentrationlowedNa+mainlyaccu-mulatedinstemandleafofA.philoxeroideanditwouldprobablyspreadtothesaltsoil.Alternantheraphiloxeroides;Saltstress;Growth;Photosynthesis;Watercontent;Membranepermeability空心莲子草(Alternantheraphiloxeroides为苋科、莲子草属的多年生宿根性草本植物,原产南美洲云南