芍药花茎强度与褪黑素含量的关系分析

Analysis of correlation between inflorescence stem strength and melatonin content of herbaceous peony

花茎挺直程度是影响芍药切花品质的重要指标,而花茎强度是衡量茎秆挺直程度的物理学标准。为了明确芍药花茎强度与褪黑素含量的关系,以高、低花茎强度的2组芍药品种为材料,测定了花茎强度、植株形态指标、植株光合参数、花茎木质素含量和褪黑素含量。结果表明:与低花茎强度芍药品种相比,高花茎强度芍药品种具有较高的茎粗、茎质量、光合能力、木质素含量和褪黑素含量,并且花茎强度与褪黑素含量之间呈正相关,两者均与木质素含量达显著正相关,表明褪黑素可能通过调控木质素合成来间接影响花茎强度,这为芍药花茎强度的调控奠定了理论基础。

The straightness of inflorescence stem is an important index affecting the cut flower quality of herbaceous peony(Paeonia lactiflora Pall.),and the stem strength is a physical standard to measure the stem straightness.To investigate the relationship between inflorescence stem strength and melatonin content of P.lactiflora,in this paper,two groups of P.lactiflora cultivars with high and low inflorescence stem strengths were used to measure the stem strength,morphology indexes,photosynthetic characteristics,lignin and melatonin contents.The results showed that the stem diameter,stem weight,photosynthetic capacities,lignin contents and melatonin contents of the P.lactiflora cultivars with high stem strength were significantly higher than those with low stem strength.Besides,correlation analysis showed that the inflorescence stem strength was positively correlated with melatonin content,and both of them were significantly positively correlated with lignin content.The results indicated that melatonin may indirectly affecting inflorescence stem strength by regulating lignin synthesis in P.lactiflora,which laid a theoretical foundation for the regulation of P.lactiflora inflorescence stem strength.