Correlation between Poplar Leaf Structure and the Resistance to Rust Infection

被引：0

作者：

Shen K. ^{[1
,2
]}

Chen Q. ^{[1
]}

Qi M. ^{[1
]}

Peng Z. ^{[1
]}

Fan J. ^{[1
]}

Yu Z. ^{[1
]}

机构：

[1] College of Forestry, Northwest A&F University, Yangling

[2] Institute of Botany, Chinese Academy of Sciences, Beijing

来源：

Linye Kexue/Scientia Silvae Sinicae | 2020年 / 56卷 / 12期

关键词：

Leaf morphological structure; Melampsora larici-populina; Poplar; Rust resistance;

D O I：

10.11707/j.1001-7488.20201209

中图分类号：

学科分类号：

摘要：

Objective: This study aimed to understand the correlation between the physical structure of poplar leaves and their rust resistance, and the corresponding morphological indexes were put forward for judging the Melampsora rust-resistance in the poplar breeding. Method:The uredinial density of 29 poplar clones was investigated in Forest Experimental Station of Northwest A&F University in late autumn. The mature leaves of the lower canopy were collected. The difference of anatomical structure of poplar leaves were analyzed by light microscopy, transmission electron microscopy and scanning electron microscopy and the correlation of 12 leaf histological indexes, such as cuticle thickness, epidermis thickness, palisade tissue thickness and so on, were studied.Result: Based on the Squared Euclidean Distance of uredinial density, 29 poplar clones were divided into three groups. In terms of the poplar section classification, Sect. Leuces were the non-hosts of M. larici-populina, Sect. Aigeiros were the resistant hosts, and Sect. Tacamahaca were the susceptible hosts. The first generation hybrids of P. deltoides cv. Lux female and P. cathayana male showed susceptibility to rust, and the rust resistance of hybrids poplars displayed a paternal transmission style. The abaxial epidermis, sponge tissue and the total leaf thickness of the host poplar were significantly thicker than those of the non-host poplars. However, palisade thickness, stomatal adjacent distance and the cell density of sponge tissue in host poplars were significantly lower than those of the non-host poplars. Among host poplars, the upper epidermis thickness of susceptible groups were significantly lower than stronger resistant groups. A stable positive correlation between the rust resistance of different poplars and the cuticle thickness, as well as the epidermal cell wall thickness of leaves was found by correlation analysis. Conclusion: There are significant differences in the rust resistance of different poplars. Cuticle thickness and upper epidermal cell wall thickness can be used as two morphological indicators in practice of the rust-resistant poplar breeding. © 2020, Editorial Department of Scientia Silvae Sinicae. All right reserved.

引用

页码：75 / 82

页数：7

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