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Meiyan Cui,Minh Duy Pham,Hyunseung Hwang,Hyein Lee,Byungkwan Lee,Jeesang Myung,Changhoo Chun 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
The cultivated strawberry (Fragaria × ananassa Duch.) is widely grown worldwide, and its financial returns are determined by fruit formation. Fruit development is closely related to the early-stage development of flowers and is affected by disorders, diseases, and environmental conditions that occur during the cultivation season. Despite its importance for controlling the cultivation conditions and achieving high, stable yield, knowledge of flower development in F. × ananassa is lacking compared to the diploid wild-type strawberry such as F. vesca. Here, we report morphological and physiological changes of anthers, pollens, and pistils of F. × ananassa at the ultrastructural level during development and define their characteristics at different developmental stages. F. × ananassa ‘Maehyang’ plants were transplanted in an experimental greenhouse at Seoul National University in Suwon, Korea on September 11, 2019. The flowers were sampled at different stages of development from buds to anthesis and observed with transmission electron microscopy and scanning electron microscopy. In male gametophyte development, thickened exine wall were visible at free microspore and vacuolated microspore stages. The exine was divided into sexine and nexine, and the sexine consisted of tectum, collumellae, and sculptural elements. We observed very thickened sexine and sculptural elements with sharp apices as unique characteristics in ‘Maehyang’ compared to other species. These morphological characteristics could affect not just pollen development but also pollination and fertilization. For female gametophytes, the development of carpels was faster in ‘Maehyang’ than in F. vesca. Particularly, the stigmatic papillae were more complex and diverse in structure. Flowering time in ‘Maehyang’ lasts from October to February, during which environmental conditions such as temperature at the time of anthesis may have strong impacts on flower development and stigma receptivity, which could affect fruit development. These observations not only can contribute to the knowledge of the floral biology of F. × ananassa, but will aid future comparative studies of species or cultivars aiming at identifying differences in tolerance and susceptibility.