花生根结线虫对花生植株内源激素、氨基酸、核酸及糖的影响

Changes in the Growth Hormones, Free Amino Acids, Nucleic Acids and Suger Contents of Peanut Plants Infected by Meloidogyne arenaria

测定了花生根结线虫浸染后，花生植株内源激素、氨基酸、核酸和糖含量的变化．结果表明，线虫浸染可引起花生根和茎叶的生长素含量、细胞分裂素和脱落酸的活性提高，赤霉素的含量降低；病根产生蛋氨酸，及其半胱氨酸、赖氨酸、精氨酸和还原糖的含量提高，脯氨酸、苏氨酸、可溶性总糖和非还原糖的含量降低；病茎叶没有脯氨酸，其苏氨酸、甘氨酸、丙氨酸、组氨酸、精氨酸、RNA、可溶性糖、非还原糖的含量和14种氨基酸总量明显降低，DNA和苯丙氨酸含量升高．

The experiments were conducted to study the changes of the growth hormones, free amino acids,nucleic acids and suger contents of peanut plants after being inoculated with M. arenaria. The results showed that the activity of cytokinin (CTK) and abscisic acid (ABA), the content of indole acetic acid(IAA) in the root and leaves of infected plants increased, and that the content of gibberellic acid (GA3) decreased. The contents of methionin(Met) in the root-knots and the healthy roots of infected Plants were 7. 83 and 6. 43 ug/g in fresh-weight respectively, while that of uninfected plants was zero.The contents of cysteine, lysine, arginin and reducing sugars in the roots of infected plants increased,while the contents of proline, threonine, total sugars and disreducing sugers decreased. The content of Pro in the leaves of uninfected plants was 106.18ug/g in fresh-weight, and that of infected plants was zero.The contents of Thr, glycine(Gly), alanin(Ala), histidine(His), Arg, RNA, total sugars, disreducing sugers and total free amino acids in the leaves of infected plants were significantly lower than those of uninfected plants, while the contents of DNA and phenylalanine(Phe) in the leaves of infected plants were bigger than those of uninfected plants. Ih the same infected plants,the contents of DNA, RNA, valine,Phe and Lys in root-knots were bigger than those of healthy roots, while the content of His of root-knot was lower.