耐低氮胁迫黄瓜品种的筛选

在正常供氮和低氮胁迫条件下，比较了18个黄瓜品种的产量、地上部生物量、植株氮素吸收总量及果实氮积累量的变化。结果表明：① 在低氮胁迫条件下，所有供试黄瓜品种的产量和果实氮积累量均有不同程度的下降，其中津优2号和津优31号下降幅度较小，津绿30号和美好下降幅度较大|津优2号和津优31号的地上部生物量、津优31号的植株氮素吸收总量有所升高，其余品种的地上部生物量、植株氮素吸收总量均有不同程度的下降，津绿30号和美好下降幅度较大|综合产量、地上部生物量、植株氮素吸收总量、果实氮积累量来看，津优2号和津优31号耐低氮能力较强，津绿30号和美好的耐低氮能力较弱。② 相关性分析表明，在低氮胁迫和正常供氮条件下，地上部生物量、植株氮素吸收总量和果实氮积累量均与产量呈极显著正相关，说明产量、地上部生物量、植株氮素吸收总量、果实氮积累量均可作为耐低氮胁迫的筛选指标。

Screening of Cucumber Cultivars for Tolerance to Low Nitrogen Stress

Total 18 different cucumber(Cucumis sativus L.)cultivars were used to study their response to low nitrogen stress by comparing their fruit yield,over ground biomass,total nitrogen uptake,fruit total nitrogen accumulate under normal and low nitrogen stress.The results showed that the fruit yield and total nitrogen accumulate of all cultivars were decreased under low nitrogen stress.Cultivar‘Jinlv No.30’and‘Meihao’decreased greatly,while the decline of‘Jinyou No.2’ and‘Jinyou No.31’were smaller;the over ground biomass‘Jinyou No.2‘and‘Jinyou No.31’and the total nitrogen uptake o‘f Jinyou No.31’were higher under low nitrogen stress than normal nitrogen,while the over ground biomass and total nitrogen uptake of other cultivars were decreased,especially‘Jinlv No.30’and‘Meihao’.From the above,we screened the stronger resistance to low nitrogen cultivars were ‘Jinyou No.2’and‘Jinyou No.31’,and the worse cultivars were‘Jinlv No.30’and‘Meihao’.The correlation analysis showed that over ground biomass and total nitrogen uptake and fruit total nitrogen accumulate were very significantly correlated to the fruit yield under low nitrogen stress and normal nitrogen.Therefore,fruit yield,over ground biomass and total nitrogen uptake and fruit total nitrogen