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湖泊科学  2011 

Cr6+胁迫对水花生(Alternantheraphiloxeroides)愈伤组织多胺代谢的影响

DOI: 10.18307/2011.0619

Keywords: 愈伤组织,水花生,Cr6+胁迫,多胺,代谢

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Abstract:

利用植物组织培养技术培养水花生愈伤组织并以此为实验材料,研究了不同Cr6+浓度(0、0.1、0.3、0.6、0.9mmol/L)对水花生愈伤组织中腐胺(putrescine,Put)、亚精胺(spermidine,Spd)、精胺(spermine,Spm)、脯氨酸(Pro)含量及精氨酸脱羧酶(ADC)、鸟氨酸脱羧酶(ODC)、多胺氧化酶(PAO)和二胺氧化酶(DAO)活性的影响.结果表明,随着Cr6+处理浓度的增大:(1)游离态腐胺(f-Put)、亚精胺(f-Spd)和精胺(f-Spm)的含量先升后降,且均在0.6mmol/L时达到峰值;(2)结合态腐胺(结合态Put)含量在0.1mmol/L时达到最大值,之后下降;而结合态Spd和结合态Spm含量则逐渐上升;(3)束缚态Put、束缚态Spd和束缚态Spm含量先升后降,在0.6mmol/L时束缚态Put与Spd达到最大值;而束缚态Spm则是在0.1mmol/L时达到最大值,之后逐渐下降;(4)ADC酶和ODC酶活性逐渐上升;而PAO、DAO酶活性则表现为先升后降;(5)Pro含量呈先升后降趋势.可见,重金属Cr6+胁迫下,破坏了水花生愈伤组织内多胺代谢平衡,造成多胺(polyamines,PAs)大量积累,较高的内源PAs在提高愈伤组织抵抗Cr6+胁迫能力的过程中发挥重要作用。

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