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胡萝卜先期抽薹遗传及环境调控研究

DOI: 10.3969/j.issn.1000-7091.2013.03.013, PP. 67-72

Keywords: 胡萝卜,先期抽薹,遗传,低温,光照

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Abstract:

先期抽薹已成为胡萝卜冬春大棚栽培和早春露地栽培的瓶颈,了解胡萝卜先期抽薹调控机理,有助于开展耐抽薹品种的选育。以春季栽培先期抽薹敏感的松滋野生胡萝卜(P1)为亲本,分别与6个栽培品种正反杂交获得F1和F2进行遗传分析,结果表明,胡萝卜先期抽薹以加性效应(VA)为主,还有显性效应(VD)及环境因子(Ve)。在露地和温室低温天数相似的生长条件下,P1和7262B(P6)在温室中的先期抽薹率显著降低,Amsterdamforcing(P4)在温室中均未出现抽薹,这可能是弱光条件所致。通过对P1、P4及其F1、F2植株遮光处理,发现短日照可显著推迟P1、F1和F2植株起始抽薹时间,降低先期抽薹率,而且处理时间越长,效果越显著,但P4处理前后均未出现抽薹。P1种根经不同时间7℃低温处理后,在长、短日照条件下表现出同样规律。而且P1植株经4~13℃处理14d均能发生先期抽薹,其中7℃处理效果最佳。

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