简介:AsoilpotcultureexperimentwithfoursuppliedPlevels(i.e.P30,P50,P100,P200,representingsupplementalP30,50,100,200mg/kg,respectively)wasconductedtoinvestigateuptakeanduseabilitytoPandZninthericegenotypeswithdifferentP-efficiency,ofwhichricegenotypes508,99011,580,99112werelow-Ptolerantand99056,99012werelow-Psensitive.Low-Ptolerantrice580and99011absorbedmorePthantheothers,andricegenotype580hadstrongeruptakeabilityespeciallyatlow-PlevelsuchasP50andP30.508couldabsorbconsiderableP,andhadthelowestPpercentageofshoot,indicatingithadgoodperformanceinP-useefficiency.ThesethreericegenotypeshadlargerbiomassandlessresponsetochangedPlevelthanricegenotype99112,99056and99012.Ricegenotype99112showedLow-Ptolerancemainlybysacrificingbiomasstomaintainhighrelativegrainyield.TheleastamountofPabsorbedby99056showedithadthelowestPuptakeefficiency,andthehighestPpercentageinshootof99012meantithadthelowestPuseefficiency.Sotheytwoshowedlow-Psensitivity.ZncontentsinshootunderP200,P100andP50weresimilar,butP30increasedZncontentinshootsignificantly.TheZncontentsinshootof99112,99056and99012werehigherthanthoseof508,99011and580,especiallyattilleringstageandbootingstage.AsfortotalZncontentinshoot,Low-Ptolerantricegenotype580hadthelargestamountandfollowedby99011and508,low-Ptolerantricegenotype99012hadthesmallestamountatthethreesamplingstageandfollowedby99056.Furthermore,P/Zninshootof99012wasthehighest,andthatof99056wasthesmallestatthesamePlevel.
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简介:丰田2号(试验号浙9102)和丰田5号(试验号浙465),是由浙江省农科院蚕桑研究所20世纪90年代初育成的桑树人工多倍体新品种.据育种单位和浙江桐乡市田间栽培及室内生物测试,丰田2号等多倍体品种的产叶量和养蚕成绩名列前茅,成为当地蚕农竞相推广的首选良种.为将多倍体桑品种新技术成果尽快转化为经济效益,江油从1998年起,从浙江省农科院蚕桑研究所等科教单位引进30余个近年来育成的桑树三、四倍体新品种,近年多年多点的实用经济性状的选拔试验.第一批(1999~2003)8个供试新品种中,以丰田2号和丰田5号达到桑叶增产能力强,养蚕效益高的选拔目标.现简介如后.