Effects of Three Exogenous Substances on Heat Tolerance of Peony Seedlings

Jiaxin Guo; Yu Huang; Xingyu Yang; Wenxuan Bu; Jianing Tian; Minhuan Zhang; Kaili Huang; Xiaoning Luo; Ye Ye; Wen Xing; Yating Huang

doi:10.3390/horticulturae9070765

Horticulturae (Jul 2023)

Effects of Three Exogenous Substances on Heat Tolerance of Peony Seedlings

Jiaxin Guo,
Yu Huang,
Xingyu Yang,
Wenxuan Bu,
Jianing Tian,
Minhuan Zhang,
Kaili Huang,
Xiaoning Luo,
Ye Ye,
Wen Xing,
Yating Huang

Affiliations

Jiaxin Guo: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Yu Huang: College of Art & Design, Nanning University, Nanning 530200, China
Xingyu Yang: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Wenxuan Bu: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Jianing Tian: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Minhuan Zhang: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Kaili Huang: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Xiaoning Luo: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Ye Ye: College of Humanities and Arts, Hunan International Economics University, Changsha 410006, China
Wen Xing: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China
Yating Huang: College of Landscape Architecture, Central South University of Forestry and Technology, Changsha 410004, China

DOI: https://doi.org/10.3390/horticulturae9070765
Journal volume & issue: Vol. 9, no. 7
p. 765

Abstract

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In this study, one-year-old seedlings of Paeonia ostii ‘Fengdan’ were used as materials. The method of spraying exogenous salicylic acid (SA), calcium chloride (CaCl2) and abscisic acid (ABA) was used. The effects of different concentrations of SA, CaCl2 and ABA on the heat tolerance of peony seedlings under high temperature stress were studied. The optimum concentration and mechanism of SA-, CaCl2- and ABA-induced heat tolerance of peony seedlings under high temperature stress were discussed. The results showed that 100 μmol/L SA, 40 mmol/L CaCl2 and 40 mg/L ABA had the best induction effect on the heat tolerance of peony. The effects of three exogenous substances on the heat resistance of peony seedlings were ranked as SA > CaCl2 > ABA. The three exogenous substances mainly alleviated high temperature damage by alleviating the degradation of chlorophyll (Chl), relative electrical conductivity (Rec) content, increasing superoxide dismutase (SOD) activity, soluble proteins (SPs), free proline (Pro) and soluble sugars (SSs) content, and reducing SSs content under high temperature stress. The five indices had the most significant effect on the three exogenous substances in improving the heat resistance of peony seedlings. These could be used as an index to identify the heat resistance.

Published in Horticulturae

ISSN: 2311-7524 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Agriculture: Plant culture
Website: http://www.mdpi.com/journal/horticulturae

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