论文部分内容阅读
以‘大青叶’(Prunus pseudocerasus var.‘Daqingye’)嫁接甜樱桃‘岱红’(P.avium‘Daihong’)为试材,研究了淹水条件下外源硝态氮对甜樱桃根系蔗糖、葡萄糖、果糖和淀粉含量及蔗糖合酶(SS)合成和分解,蔗糖中性转化酶(NI)和蔗糖酸性转化酶(AI)活性的影响。结果表明,淹水过程中处理与对照根系蔗糖、葡萄糖、果糖和淀粉含量均呈先升后降趋势;与对照相比,外源NO3-提高了根系中蔗糖、葡萄糖、果糖和淀粉的含量,最大值分别比对照提高18.02%、21.97%、25.27%和11.41%。淹水过程中根系SS分解活性呈先升后降趋势,而SS合成活性、NI和AI活性呈下降趋势;加入NO3-后,4种酶活性均高于对照。这些结果表明,淹水条件下外源NO3-可通过调控根系的糖代谢而增强甜樱桃耐低氧能力。
Using P.avium’Daihong ’(grafted with Prunus pseudocerasus var.’ Daqingye ’) as test material, the effects of exogenous nitrate nitrogen on sweet cherry root sucrose under flooding conditions , Glucose, fructose and starch content and the synthesis and decomposition of sucrose synthase (SS), sucrose neutral invertase (NI) and sucrose acid invertase (AI). The results showed that the contents of sucrose, glucose, fructose and starch in roots and roots of treated and control roots all increased at first and then decreased. Compared with the control, exogenous NO3- increased the contents of sucrose, glucose, fructose and starch, The maximum values were increased by 18.02%, 21.97%, 25.27% and 11.41% respectively over the control. During the flooding process, SS decomposition activity increased firstly and then decreased, while SS synthesis activity, NI and AI activity showed a decreasing trend. After adding NO3-, the activity of four enzymes were higher than the control. These results indicate that exogenous NO3 - under flooding conditions can enhance sweet cherry tolerance to hypoxia by regulating sugar metabolism in roots.