盐碱胁迫对碱地肤的生物量及含氮化合物的影响

Effects of salt and alkali stress on biomass and nitrogenous compounds of Kochia sieversiana

为探讨盐碱胁迫下碱地肤(Kochia sieversiana)体内含氮化合物积累的差异,本研究对碱地肤幼苗进行盐胁迫或碱胁迫处理,监测碱地肤的生物量及各种含氮化合物含量随胁迫时间的动态变化。结果表明,盐、碱胁迫均抑制碱地肤生物量的积累,而碱胁迫抑制作用更为严重。随着盐、碱胁迫的延长,碱地肤体内硝态氮(NO3^–-N)、氨态氮(NH4^+-N)、脯氨酸、甜菜碱等含氮化合物含量均受到影响,且碱胁迫对其影响更大。可见,与盐胁迫相比,碱胁迫严重干扰碱地肤的氮代谢,碱地肤响应碱胁迫的氮代谢调节机制复杂,值得深入探讨。

Seedlings of Kochia sieversiana were exposed to salt stress and alkali stress treatments.Differences in nitrogenous compound accumulation in K.sieversiana under salt and alkali stress were investigated by determining and analyzing the changes in biomass and contents of nitrogenous compounds,among other factors.The results showed that treatment with both salt and alkali stress inhibited the biomass accumulation of K.sieversiana,with the inhibition effects of alkali stress being more serious than those of salt stress.Contents of nitrogenous compounds,such as NO3^–-N,NH4^+-N,proline,and betaine,among others,in K.sieversiana shoots were affected by increasing duration of salt and alkali stress.The effects of alkali stress was more severe than those of salt stress.Therefore,alkali stress strongly disturbs nitrogen metabolism in K.sieversiana.The regulation mechanism of nitrogen metabolism in K.sieversiana in response to alkali stress is extremely complex and requires further analysis.