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Bulletin of Botanical Research ›› 2025, Vol. 45 ›› Issue (6): 952-964.doi: 10.7525/j.issn.1673-5102.2025.06.012

• Original Paper • Previous Articles     Next Articles

Analysis of Physiological and Biochemical Indexes Changes During Seed Germination of Paris polyphylla var. yunnanensis

Yingying FU1,2, Jiahui LAI1, Huayi YUAN1,2, Hongya YU1,2, Guanghua LIU1, Furong XU1,2()   

  1. 1.College of Traditional Chinese Medicine,Yunnan University of Chinese Medicine,Kunming 650500
    2.Yunnan Key Laboratory of Dai and Yi Medicines,Kunming 650500
  • Received:2024-12-20 Online:2025-11-20 Published:2025-11-27
  • Contact: Furong XU E-mail:xfrong99@163.com

Abstract:

To explore the main physiological and biochemical factors affecting the dormancy release of seeds, the seeds of P. polyphylla var. yunnanensis were used as materials, and the phenotypic changes of embryos were observed by stereomicroscope. Five typical stages(S1, spherical embryo; S2, short cylindrical embryo; S3, conical embryo; S4, torpedo embryo; S5, budding) were screened out, respectively. Physiological and biochemical methods and ELISA were used to determine the nutrient content, enzyme activity and plant hormone content in the seeds at each stage. The results showed that the embryo rate was finally(66.50±6.22)%; the water absorption rate was 76.54%. The main nutrient of P polyphylla var. yunnanensis seeds was starch. During the germination process, the contents of starch, free amino acids and activity of glucose-6-phosphate dehydrogenase(G-6-PDH) showed a decreasing trend; the content of soluble sugar showed a trend of decreasing first, then increasing and then decreasing again; the activities of peroxidase(POD), malate dehydrogenase (MDH) and content of gibberellin A3(GA3) showed a trend of increasing first and then decreasing; the contents of gibberellin A4(GA4) and indole-3-acetic acid(IAA) showed a trend of decreasing first and then increasing, superoxide dismutase(SOD) activity increased significantly in S5 stage, catalase(CAT) activity showed a trend of M type fluctuation, abscisic acid(ABA) content showed a trend of ‘decreasing-increasing-decreasing-increasing’. The embryo rate was significantly positively correlated with SOD activity, and significantly negatively with G-6-PDH activity and free amino acids content. GA3 content was significantly positively correlated with CAT activity, GA4 content was significantly positively correlated with contents of starch and amino acids(P<0.01), while IAA content was significantly negatively correlated with soluble sugar content(P<0.01). The dormancy type of P. polyphylla var. yunnanensis seeds was morphological and physiological dormancy; and the development status of embryo was closely related to the fluctuation of physiological and biochemical indexes. The increases in contents of soluble sugar, free amino acid, GA3 and GA4, GA3/ABA and IAA/ABA, and activities of SOD, POD and CAT were all helpful to the release of seed dormancy.

Key words: Paris polyphylla var. yunnanensis, seeds, different germination stages, physiological and biochemical indicators

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