简介:Co,Ni,CrandVin25typicalsoilsofChinawerefractionatedintoexchangeable,carbonatebound(calcareoussoils),Mnoxidebound,organicallybound,amorphousFeoxidebound,crystallineFeoxideboundandresidualformsusingaseven-stepsequentialextractionprocedure,soastostudythedistributionofchemicalformsofthesemetalsaswellastheeffectsofsoilproipertiesonthedistribution.TheresultsshowedthatmostofsoilCo,Ni,CrandVwerepresentinresidualforms,andthedistributionratioaveraged48.2%forCo,53.0%forNi,81.5%forCrand68.7%forV.Thespeciationofheavymetalswasgreatlyinfluencedbysoilphysico-chemicalpropertiesandthechemistryofelements.Theresultsalsoindicatedthattherecoveryofmetalelementsbythesequentialextractionprocedurewassatisfactory,withtherelativedifferencebetweenthesumofsevenformsandthetotalcontentinsoilsaveraging9.5%forCo,12.8%forNi,6.6%forCrand7.2%forV.
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简介:为明确一株云烟87八倍体(2n=8x=96)与N.plumbaginifoliaViv.(2n=2x=20)的杂交后代的部分生物学特性。对该后代进行了形态观测,细胞学遗传学分析,育性分析,并进行黑胫病抗性的离体鉴定。结果显示,该杂交后代(无性系)大部分外观形态指数介于云烟87四倍体与N.plumbaginifolia之间;花冠颜色与云烟87相近,花药颜色与N.plumbaginifolia相近。其染色体数目为58条,其中含有来自N.plumbaginifolia的10条染色体。花粉离体培养未见萌发;与云烟87四倍体杂交,做母本时坐果率为100%,平均每个蒴果获得102.60±25.12粒可萌发的种子,以其为父本及自交时未获得成熟蒴果。该杂交后代(无性系)对黑胫病抗性强于云烟87,与N.plumbaginifolia相近。综上所述,该杂交后代为云烟87与N.plumbaginifolia的真杂种(2n=5x=58);其雄性败育,但雌性可育;且具较强的黑胫病抗性。
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