Insights into the dwarfing mechanism of pear (Pyrus betulaefolia) based on anatomical and structural analysis using X-ray scanning
| Autor: | Lili Dong, Chuxuan Yang, Jing Wang, Jingjing Li, Mei Zhao, Dingli Li, Zhiyun Qiu, Chunhui Ma, Zhenhua Cui |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Horticultural Plant Journal, Vol 10, Iss 2, Pp 355-366 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2468-0141 64604225 |
| DOI: | 10.1016/j.hpj.2023.03.013 |
| Popis: | The lack of a suitable rootstock to control scion growth has limited the development of high-density plantations in pear production, which is partly attributed to poor understanding of the dwarfing mechanism. In the present study, the rootstock of the dwarf-type pear (Pyrus betulaefolia) ‘PY-9’ was identified and used as the material for anatomical analysis. ‘PY-9’ grew to half the tree height of the normal cultivar ‘Zhengdu’, along with fewer internodes and shorter length. Significant differences in growth rate between ‘PY-9’ and ‘Zhengdu’ were detected at approximately 30 days after full bloom, which corresponded with the time of the greatest difference in water potential between the dwarf and normal cultivar. ‘PY-9’ showed a higher photosynthetic rate than ‘Zhengdu’. Anatomical analysis showed that ‘PY-9’ had higher area ratios of both phloem and xylem and more developed vascular tissues than ‘Zhengdu’. The three-dimensional reconstructed skeleton of the xylem from X-ray computed tomography scanning revealed greater intervessel connectivity in ‘Zhengdu’ than in ‘PY-9’, which could contribute to the more vigorous growth of ‘Zhengdu’. This study thus provides the first comparison of the microstructural properties of xylem elements between a dwarfing-type and vigorous-type pear rootstock, providing new insights into the dwarfing mechanism in pear and facilitating breeding of dwarf pear rootstocks to increase crop productivity. |
| Databáze: | Directory of Open Access Journals |
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