Abstract:

In order to explore the development and change of seed development and dormancy of wild Rosa rugosa during fruit formation， the wild R.rugosa Thunb. from Hunchun， Jilin Province was used as the experimental material. The green fruit period（1-35 d）， color change period（35-60 d）， and red fruit period（60-75 d） were classified respectively， and the morphology， histocytology， and high-performance liquid chromatography were used to analyze the fruit. Seed morphology， seed embryo and endodermal development at various developmental stages were studied， and the relationship between changes in endogenous hormone content of seeds and fruit development and seed dormancy was analyzed. The fruit and seeds developed the fastest during the green fruit period（1-35 d）， the seed embryos developed completely in 24 d after anthesis， and the seeds did not exist in morphological dormancy. Within 24 d after flowering， the inner peel began to deposit lignin and gradually lignified， and the seeds began to dormant. The seed hormone content changed closely related to fruit development， and to color conversion and to lignification of endocarp. Endogenous GA₃ and ABA content of seeds reached their peak during the green fruit period（1-35 d）， and endogenous IAA content during the fruit color conversion period（35-60 d） reached the maximum， and the high concentration of ABA content was the main reason for the seeds to enter physiological dormancy before they left the fruit.

Key words: Wild Rosa rugosa, seed dormancy, fruit development, seed embryo development, endogenous hormone