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1、水稻出苗顶土动力源研究中国水稻科学(ChineseJRiceSci),2005,19(1);59～62
http://www.ricescience.org
水稻出苗顶土动力源研究
张光恒林建荣吴明国曹立勇程式华(o0[]~NNNN,浙江杭州310006;*通讯联系人)
AnalysisonGerminatingDynamicSourceofRice(Oryzasativa)
ZHANGGuang-heng,LINJian—rong,WuMing-guo,CAOLi—yong,CHENGShi—hua
(ChinaNationalRiceResearchInstitute,Hang
2、zhou310006,China;Correspondingauthor)
Abstract:Bytestingthegerminationspeed,seedlingemergencerate,coleoptilenodelengthandmesocotyllengthofcuhi—
vatedricevarietiesatdifferenttreatmentsofsoildepth(2cm,4cmand6cm)duringgermination.thegerminatingdynamic
sourceofricewasstudied.Germinatingdynamicsinr
3、icemostlycamefromtheelongationofcoleoptilenodeandmesocotyl,
andtherewereobviousdifferencesamongdifferentricegermplasmsunderdifferentresistanceconditions.At2cmsoildepth,
thegerminationspeedandseedlingemergencerateofcultivatedricevarietiesweresimilartothegerminationrateindoors.
Longmesocotylvari
4、etieshadhighgerminationspeedandnormalseedlingemergencerateat4cmor6cmsoildepth,whereas
theshortmesocotylonescontrarily,e.g.theseedlingemergencerateofChunjiang683weredecreasedby6.5and86.2per—
centpointscomparedwithgerminationrateindoors,respectively.Itwasalsoindicatedthattheelongationofmesocotyl
5、played
akeyroleinricegerminationat4cmand6cmsoildepth.Thelongmesocotylricegermplasmshadstronggerminatingdynam—
ics,whichmostlycamefromtheactionofcoleoptileandmesocotyltogether;whereastheshortmesocotylgermplasmshad
poorgerminatingdynamicswhichonlycame{romtheelongation0fcoleoptile.Usingthelongmes
6、ocotylgermplasmtOsolve
theproblemoflodgingandgerminationrateindirect-seededriceproductionwasalsodiscussed.
Keywords:rice;direct—seededrice;mesocotyl;germinationrate;seedlingemergencerate;dynamics
摘要:在自然条件下,通过设计不同的出苗阻力(覆土深度2cm,4cm和6cm)来测定中胚轴伸长潜力不同的水稻种
质的出苗速度,成苗率和芽鞘节及中胚轴的长度,以分析影响水稻种子顶土出苗的动力源.结果表
7、明,水稻种子的出苗动力
主要来源于芽鞘节间和中胚轴的伸长.在不同阻力处理条件下,不同种质出苗动力差异较大,其中覆土2cm的不同种质出
苗率相差不明显,与室内发芽率结果比较接近,覆土4cm和覆土6cm的两个处理不同种质问出苗率差异明显,长胚轴种质
出苗速度快,出苗率高,出苗率与室内发芽率相差不大;而短胚轴种质出苗速度慢,出苗率低,其中春江683的出苗率与室内
发芽率相比分别下降了6.5和86.2个百分点.研究表明水稻中胚轴的伸长对覆土较深的种子顶土出苗起到关键作用,长胚
