NaCl对碱茅游离氨基酸成分及脯氨酸等含量的影响

分析了NaCl胁迫下碱茅幼苗中15种游离氨基酸的消长规律。结果表明在适境条件下碱茅地上部脯氨酸占总游离氨基酸的10.53％,盐逆境下脯氨酸稳定地增加。随着盐浓度的升高,碱茅地上部中丝氨酸增加倍数较大,精氨酸含量降低或略有增加;其地下部中丝氨酸含量增加甚小,精氨酸含量在一定盐度范围内增加较大。此外NaCl胁迫下,处理1,2及3植株地上部中蛋白质含量分别下降了3.46％,7.55％和7.04％,淀粉含量分别下降了3.53％,11.81％和12.35％;其地下部中蛋白质含量分别增加了4.15％,2.04％和2.18％。处理1和2淀粉含量增加了1.45％和2.93％,处理3淀粉含量下降了2.92％。

The Effects of NaCl on Component of Free Amino Acid and the Contents of Pro in Alkaligrass

The growth and decline law of fifteen free amino acids was analyzed at above--ground and under ground parts of alkaligrass seedling under the salt stress. The results showed that the content of Pro was 10.53% of total free amino acide at above--ground parts under the suitable condition. Under the severe condition, Pro increased stablely. With the increase of salt concentration, Set content increased, but Arg content decreased or just a little increased at above--ground parts of alkaligrass. Few Set content increase was found, but Arg content increased highly in some salt concentration extent at under--ground parts. Otherw/se, under salt stress, in treatment 1, 2, 3 decreased content of protein by 3.46%, 7. 55%0 and 7.04%, and decreased content of starch by 3.53%, 11.81% and 12.35% respectively, at the aboveground parts; increased content of protein by 4.15% ,2.04% and 2. 18%, increased content of starch by 1.45% and 2.93% in treatment 1.2, but decreased content of that by 2.92% in treatment 3 at underground parts.