Effects of chitooligosaccharide on the growth physiology of Paeonia ostii ‘Feng Dan’ seedlings under drought stress

SHI Xinlong, YANG Yueqin, XUE Xian, LIU Wei, SONG Chengwei, GUO Lili, HOU Xiaogai

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (2) : 120-126.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (2) : 120-126. DOI: 10.12302/j.issn.1000-2006.202003012

Effects of chitooligosaccharide on the growth physiology of Paeonia ostii ‘Feng Dan’ seedlings under drought stress

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Abstract

【Objective】This study was carried out to investigate the effects of chitooligosaccharide(COS) on the growth, physiology and drought resistance mechanisms of tree peony under drought stress, which provides a theoretical basis for the study of environmental selection and drought resistance during seedling cultivation.【Method】To investigate alleviation of drought stress in plants via COS, biennial Paeonia ostii ‘Feng Dan’ seedlings under different drought stress conditions (water withheld for 7, 9, 11, 13, 15 d) were treated with COS at five concentrations (0, 20, 40, 60, 80 mg/L), and the treated seedlings were collected for physiological analysis.【Result】Compared with the control, treatments that provided exogenous COS during drought stress promoted the growth of tree peony seedlings, thereby markedly improving their relative water content and contents of chlorophyll, soluble sugar(SS), and soluble protein(SP), coupled with an enhanced net photosynthetic rate. Moreover, the superoxide dismutase(SOD), peroxidase(POD), and catalase(CAT) activities of P. ostii ‘Feng Dan’ were significantly increased, and the contents of malondialdehyde(MAD) and H2O2 were significantly reduced.【Conclusion】COS treatment at 40 mg/L could effectively alleviate drought damage and enhance resistance in P. ostii ‘Feng Dan’ seedlings.

Key words

Paeonia ostii ‘Feng Dan’ / drought stress / chitooligosaccharide / biomass / antioxidant enzyme / osmoregulatory substance

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SHI Xinlong , YANG Yueqin , XUE Xian , et al . Effects of chitooligosaccharide on the growth physiology of Paeonia ostii ‘Feng Dan’ seedlings under drought stress[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(2): 120-126 https://doi.org/10.12302/j.issn.1000-2006.202003012

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