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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (7): 1718-1732.doi: 10.16420/j.issn.0513-353x.2024-0645

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Physiological Response and Transcriptome Analysis of Wax Apple Flowering to Foliar Application of Chlorpyrifos

SUN Dongyu1, WEI Dong1, YANG Yinyan1, HU Caizhu1, HU Zhiqun1, ZHOU Donghui2,*(), and ZHOU Biyan1,*   

  1. 1 Key Laboratory of Horticultural Crop Biology and Germplasm Creation in South China,Ministry of Agriculture and Rural Affairs,College of Horticulture,South China Agricultural University,Guangzhou 510642,China
    2 Center for Modern Agricultural Development,Zhuhai,Guangdong 519000,China
  • Received:2024-11-03 Revised:2025-05-21 Online:2025-07-23 Published:2025-07-23
  • Contact: ZHOU Donghui, and ZHOU Biyan

Abstract:

Lorsban(active ingredient:chlorpyrifos)serves as a primary flowering inducing agent in wax apple production. The effects of chlorpyrifos spray on flowering branch rate and inflorescence number in wax apple‘Yinduhong’were investigated. Physiological responses were assessed by measuring the content of malondialdehyde(MDA),ascorbic acid(AsA)and reduced glutathione(GSH),soluble proteins,as well as superoxide dismutase(SOD)and peroxidase(POD)activities. Concurrently,transcriptome sequencing was performed to analyze gene expression changes under chlorpyrifos treatment. The results showed that foliar application of 1.67 g · L-1 chlorpyrifos significantly promoted flowering in‘Yinduhong’wax apple. Concurrently,the activity of antioxidant enzymes(SOD and POD)and the content of ascorbic acid(AsA),reduced glutathione(GSH),and soluble proteins in the leaves increased. Transcriptome analysis revealed that differentially expressed genes(DEGs)were primarily enriched in photosystems and photosynthetic membranes,involving photosynthesis pathways. Among 27 key DEGs identified,8 were related to respiration,4 to photosynthesis,3 to carbohydrate metabolism,2 to flowering regulation,4 to salicylic acid pathway,1 to auxin signaling,3 to abscisic acid response,and 2 to redox homeostasis. Partial least squares structural equation modeling(PLS-SEM)demonstrated significant correlations among most variables. Module analysis indicated a positive relationship between the redox homeostasis module and flowering induction module,with two key DEGs(SsHTH and SsOxr1)in these modules showing positive regulation and playing crucial roles in wax apple flowering induction.

Key words: wax apple, chlorpyrifos, flower induction, antioxidant system, transcriptome analysis