PEG胁迫对不同培养方式下金发草愈伤组织再生能力的影响

Effect of Polyethylene Glycol on the Regeneration of the Callus of Pogonatherum paniceum Under Different Culture Conditions

摘要:

在静置液体培养和振荡液体培养方式下，研究了聚乙二醇（PEG）胁迫对金发草［Pogonatherum paniceum（Lam.）Hack］愈伤组织的再生能力和游离脯氨酸（F-Pro）积累的影响。发现金发草愈伤组织具有较高的耐PEG胁迫能力，培养方式与PEG胁迫对其再生抑制上存在时间与程度两个方面的表现。振荡培养方式主要表现为延迟再生时间，而PEG胁迫则主要表现为降低再生频率。两种培养方式都能使愈伤组织在PEG胁迫下发生F-Pro积累，F-Pro含量随PEG浓度的增加和培养时间的增长而升高。去胁迫后，大部分愈伤组织都能够恢复再生能力，F-Pro可能在抑制和恢复过程中作用较复杂。因此，在利用愈伤组织筛选抗旱植株时，PEG浓度应在300 g·L^-1以上，处理时间3周以上，静置培养更有利于抗旱突变体的筛选。

Abstract:

This paper studied the effect of polyethylene glycol (PEG) on regeneration and free proline accumulation of callus of Pogonatherum paniceum (Lam.) Hack. under motionless liquid culture condition and shake liquid culture condition. Callus of P. paniceum had the ability to resist the stress of PEG. The effects of PEG stress and culture conditions on the callus of P. paniceumappeared mainly in two aspects, delaying regeneration time and debasing regeneration rates. The shake liquid culture mainly delayed the regeneration time and PEG stress mainly debased the regeneration rates. Free proline accumulated in the two culture conditions, and the contents of proline were positively correlated with PEG concentrations and culture time. After stress removal, most of the callus could recover the ability of regeneration, and the free proline might pay an important part in the inhibition and recovery. So it must be chosen a more than 300 g·L^-1 PEG concentration and long than 3 weeks culture time in the selection of drought-resistant mutants of P. paniceum. The motionless liquid culture was more suitable for selection of drought-resistant mutants.