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ID:32027208
大小:1.47 MB
页数:38页
时间:2019-01-30
《水稻再生芽萌发调控的生理机制与技术.研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、lowdensitycouldimproveratooningbudgrowthandpromotesurvivalbudrate.③150kg/haofNapplyingforbuddevelopmentat20thdaysafterfullheadingofthemaincropcouldincreasethepercentageofsurvivatbudsandthe1engthofratooningbuds,PhysiologicalassayindicatedthatNapplyingforbuddevelopmentmightincreasethesolub
2、leproteinandchloropyllcontent,strengthenSODactivity,reduceaccumulationofMDA,membranepermeability,NapplYingmightalSOraisethedrymatterweightofstemandrootactivity,buttheeffectsof300kg/haNapplyingonimprovethegrowthandsurvivalbudspercentageandraisephysiologicalactivityofmaincropbecomeweak,bes
3、idesthat,300kg/haNofapp!YingalSOreducetheYieldofmaincrop.④SprayingplantgrowthregulatorsOnriceleaveswasbeneficialtoincreasetheSUFVlvalbudrateandbecauseoftheincreaseinactiVityofSODofstemandleat'.thedeclinelevelofiipidsuperoxide0fcell,andthemitigationofdecompositionofchloroplyllandproteinof
4、leayesaswellaSimproveactiVityofthetootsystem.Theeffectsonincreasingyieldandimprovingsurviva]budsrateratooningbudgerminationchangedwiththevarietiesofgrowthregulatorsandthetimeofspraying.AccordingtothepresenCexperiment,itWaSbesttosprayOaochanjingatthe5thday,4PU一30andGA-satthe15thdayafterma
5、incropfullheadingforraiSingsurvivalbudrateandyietdofmaincrop,butitwasbesttosprayGaochanjing,GA”4PU一30atthe5dayaftermaincropfullheadingforimprovingbudgrowth.KeyWords:rice:germinationofratooningbuds:density:Napplyingplantgrowthregulators:physiologicalmechanism;technology:4文献综述1再生稻的生长发育再生芽的
6、生长发育是在前季基部节闻伸长开始的,以后各节潜伏芽依次逐渐分化生长和发育,在头季抽穗后则处于休眠状态,各节休眠芽的长度,在头季抽穗之初,愈下位芽愈长,但随头季成熟进程,上部节位有所增长,而下部芽无大的变化,倒头季成熟时,上部芽比下部芽长“’“。但因材料不同所得结果不~样。’‘“1。在芽伸长的同时,稻桩上的腋芽也开始不同程度的分化,前季稻抽穗时,母茎中部或偏上部节上潜优芽幼穗分化己达颖花分化期,基部节上的潜伏芽为一次技梗,少数为苞分化期,在前季抽穗到成熟期间,潜伏芽穗分化进程为休眠状态,幼穗发育处于一次技梗到颖花分化期,但也有研究认为再生芽的幼穗分化是在头季齐穗后10天或
7、15天开始的,并有上位芽幼穗分化时期早,下位芽较迟;上部芽前期分化快,下部芽后期分化快的特点。到头季完熟时期各节芽的穗分化时期相差不大,约在雌雄蕊原基形成期1“。由于再生芽在头季成熟前基于抽{!惠前开始幼穗分化,因而再生稻的生育期较短,在头季收割后的25~30天,再生稻齐穗,至再生稻成熟仅60天左右。通常有愈靠近上部的节位芽生育期愈短,而愈下部节位芽生育期愈长的特点‘⋯“⋯。2影响再生力的因素水稻再生力是指水稻稻桩节位上的休眠芽萌发成再生苗的能力,一般阻单株每桩每茎秆平均再生苗数作为衡量水稻品种再生力强弱的指标。再生稻的产量在很大程度上决
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