外源甜菜碱对NaCl胁迫下玉米幼苗生长和叶绿素含量的影响

Effects of Exogenous Glycine Betaine on the Growth and Chlorophyll Content of Maize Seedlings under NaCl Stress

以玉米(Zea mays L.)幼苗为材料,通过水培试验,研究了不同浓度的外源甜菜碱对NaCl胁迫下玉米幼苗地上部、根系生长和叶绿素含量的影响。结果表明,在150 mmol/L NaCl胁迫下,不同浓度甜菜碱处理均能缓解NaCl胁迫对玉米幼苗的伤害,促进其生长,其中1.00 mmol/L甜菜碱处理的各项指标均优于其他浓度处理,与NaCl胁迫对照相比,其幼苗的株高、地上鲜重、根鲜重、地上干重和根干重分别提高了16.59%、14.35%、26.41%、32.63%和69.43%,叶绿素含量增加了24.27%,幼苗的总根长、总表面积、根体积、总分支数、总交叉数和根系活力分别提高了118.70%、71.38%、28.25%、176.15%、169.15%和63.99%,根系直径降低了30.25%。说明外源甜菜碱可通过促进幼苗的生长、增强根的吸收能力来缓解NaCl胁迫对玉米幼苗生长的抑制,且以1.00 mmol/L甜菜碱处理的缓解效果最好。

The experiment was carried out to study the effects of exogenous glycine betaine on the growth, root and chlorophyll content of maize（Zea mays L.） seedlings under NaCI stress in nutrient solution culture. The results showed that all growth indicators of maize seedlings were improved in different extent by supplying different concentrations of glycine betaine compared with 150 mmol/L NaCl treatment. The performance of all indicators under 1.00 mmol/L glycine betaine treatment were superior to the others. Compared with the NaCl stress treatment,its plant height,upper ground weight,root weight,shoot dry weight and root dry weight of an individual plant of seedlings was improved by 16.59% ,14.35% ,26.41% ,32.63% and 69.43% respectively;chlorophyll content increased by 24.27% ;total root length, （surface） area,volume,root total count,root system to the total number of cross and root activity was improved by 118.70% ,71.38% ,28.25% ,176.15%,169.15% and 63.99% respectively; the root diameter was significantly reduced by 30.25%. The research illustrated that exogenous glyeine betaine could improve the root activity and alleviate the inhibition of seeding growth under NaCl stress by promoting the growth of maize seedings. The mitigation effect of 1.00 mmol/L glycine betaine treatment was the best.