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Article

A Susceptible Scion Reduces Rootstock Tolerance to Ralstonia solanacearum in Grafted Eggplant

1
Horticultural Science, Agricultural College of Guangxi University, Nanning 530004, China
2
Bioscience and Biotechnology Center, Nagoya University, Nagoya 4648601, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Horticulturae 2019, 5(4), 78; https://doi.org/10.3390/horticulturae5040078
Submission received: 29 July 2019 / Revised: 8 December 2019 / Accepted: 12 December 2019 / Published: 12 December 2019
(This article belongs to the Special Issue Innovation in Propagation of Fruit, Vegetable and Ornamental Plants)

Abstract

The bacterial wilt pathogen (Ralstonia solanacearum) is a highly pathogenic soil-borne bacterium that invades the vascular system of a host plant leading to plant wilting and death. In agricultural systems, tolerant rootstocks are usually used to enhance disease resistance and tolerance in crop plants to soil-borne pathogens. Here, two distinct eggplant cultivars with different tolerances to R. solanacearum infection, the disease-tolerant cultivar ‘S21′ and the disease-susceptible cultivar ‘Rf’, were used to investigate if scion tolerance level can affect tolerance of rootstock upon an infection of the same pathogen. Three scion/rootstock grafted combinations were considered: Rf/S21, S21/S21, and Rf/Rf. Plants that resulted from the combination Rf/S21, composed of the susceptible scion grafts, showed weak tolerance to R. solanacearum infection, and exhibited the poorest growth compared to the tolerant scion grafts (S21/S21). As expected, the combination Rf/Rf showed the lowest level of disease tolerance. Furthermore, a high level of exopolysaccharides (EPSs) and cell wall degrading enzymes (CWDEs) were detected in susceptible scion grafts. These factors are involved in plant growth inhibition due to blocking transport between scion and rootstock and damage of vascular tissues in the plant. A high level of reactive oxygen species (ROS) and active oxygen scavenging enzymes were also detected in susceptible scion grafts. Excess accumulation of these substances harms the dynamic balance in plant vascular systems. These results indicated that the use of a susceptible scion in scion/rootstock eggplant grafts contributed to a reduction in rootstock tolerance to Ralstonia solanacearum.
Keywords: bacterial wilt; Solanum melongena; susceptible; tolerance; exopolysaccharides; cell wall degrading enzymes bacterial wilt; Solanum melongena; susceptible; tolerance; exopolysaccharides; cell wall degrading enzymes

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MDPI and ACS Style

Huang, C.; Wang, Y.; Yang, Y.; Zhong, C.; Notaguchi, M.; Yu, W. A Susceptible Scion Reduces Rootstock Tolerance to Ralstonia solanacearum in Grafted Eggplant. Horticulturae 2019, 5, 78. https://doi.org/10.3390/horticulturae5040078

AMA Style

Huang C, Wang Y, Yang Y, Zhong C, Notaguchi M, Yu W. A Susceptible Scion Reduces Rootstock Tolerance to Ralstonia solanacearum in Grafted Eggplant. Horticulturae. 2019; 5(4):78. https://doi.org/10.3390/horticulturae5040078

Chicago/Turabian Style

Huang, Chaokun, Yuexia Wang, Yanjuan Yang, Chuan Zhong, Michitaka Notaguchi, and Wenjin Yu. 2019. "A Susceptible Scion Reduces Rootstock Tolerance to Ralstonia solanacearum in Grafted Eggplant" Horticulturae 5, no. 4: 78. https://doi.org/10.3390/horticulturae5040078

APA Style

Huang, C., Wang, Y., Yang, Y., Zhong, C., Notaguchi, M., & Yu, W. (2019). A Susceptible Scion Reduces Rootstock Tolerance to Ralstonia solanacearum in Grafted Eggplant. Horticulturae, 5(4), 78. https://doi.org/10.3390/horticulturae5040078

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