Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (4): 632-639.DOI: 10.3969/j.issn.1004-1524.2021.04.08

• Horticultural Science • Previous Articles     Next Articles

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

SHI Wenbo(), GAO Tianxiang, HU Yunyu, XU Cong, TAO Jun, ZHAO Daqiu*()   

  1. College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
  • Received:2020-08-07 Online:2021-04-25 Published:2021-04-25
  • Contact: ZHAO Daqiu

Abstract:

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.

Key words: herbaceous peony, stem strength, melatonin

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