首页|Insights into the dwarfing mechanism of pear(Pyrus betulaefolia)based on anatomical and structural analysis using X-ray scanning

Insights into the dwarfing mechanism of pear(Pyrus betulaefolia)based on anatomical and structural analysis using X-ray scanning

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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.

Pyrus betulaefoliaAnatomical analysisDwarfing mechanismIntervessel connectivityRootstock

Lili Dong、Chuxuan Yang、Jing Wang、Jingjing Li、Mei Zhao、Dingli Li、Zhiyun Qiu、Chunhui Ma、Zhenhua Cui

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College of Horticulture,Qingdao Agricultural University,Qingdao,Shandong 266109,China

College of Landscape and Forestry,Qingdao Agricultural University,Qingdao,Shandong 266109,China

Agriculture Science and Technology of Shandong ProvinceAgricultural Variety Improvement Project of Shandong ProvinceEarmarked Fund for CARS

2019YQ0152022LZGC011CARS-28-07

2024

10.1016/j.hpj.2023.03.013

园艺学报(英文版)

园艺学报(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.10(2)
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