Preliminary report on the improved resistance towards Pseudomonas syringae pv. actinidiae of cultivated kiwifruit ( Acti
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Preliminary report on the improved resistance towards Pseudomonas syringae pv. actinidiae of cultivated kiwifruit (Actinidia chinensis) when grafted onto wild Actinidia guilinensis rootstock in vitro Fa-ming Wang 1 & Jie-wei Li 1 & Kai-yu Ye 1 & Hong-juan Gong 1 & Ping-ping Liu 1 & Qiao-sheng Jiang 1 & Bei-bei Qi 1 & Quan-hui Mo 1 Received: 27 July 2020 / Accepted: 20 November 2020 # Società Italiana di Patologia Vegetale (S.I.Pa.V.) 2020
Abstract The production of kiwifruit around the world is widely affected by the bacterial canker disease caused by Pseudomonas syringae pv. actinidiae (Psa). The use of resistant rootstock is considered to be an effective way to control diseases; however, there are few studies on the evaluation and utilization of Psa-resistant rootstocks in kiwifruit. A genotype Gui-1 in the Actinidia guilinensis species demonstrated strong resistance to Psa in our previous study, so it was used as a rootstock to evaluate its effect on the resistance of the highly susceptible cultivar ‘Hongyang’ (Actinidia chinensis) with an in vitro assay. The results show that Gui-1 significantly improved the resistance of ‘Hongyang’ scion to Psa without affecting the fruit quality, and also showed that the in vitro cane could still maintain the rootstock-induced resistance, but the resistance imparted to the scion by the rootstock might be spatially and temporally uneven. This study first provides the laboratory evidence of grafting-induced resistance to Psa, which provides a foundation for the application of resistant rootstock in kiwifruit production. The study also provides implications for the study of the mechanism of rootstock–scion interaction, especially those related to the resistance to non-soil-borne disease. Keywords Grafting . Bacterial canker . In vitro assay . Rootstock–scion interaction . Non-soil-borne disease
Kiwifruit bacterial canker is one of the most destructive disease in kiwifruit production. It is a non-soil-borne disease caused by Pseudomonas syringae pv. actinidiae (Psa) (Vanneste 2017), and its disease symptoms are mainly characterized by leaf spots, flower rot, shoot dieback, cane wilting, and even the complete vine death (Serizawa et al. 1989; Vanneste 2017); there is currently no cure once disease occurs (Donati et al. 2014). Most of the existing commercial cultivars have demonstrated a lack of resistance genes; therefore, how to reduce the susceptibility of the existing cultivars to Psa is an immediate concern in kiwifruit production. The use of resistant rootstocks is considered to be an effective way to control disease; however, there is a lack of Psa* Quan-hui Mo [email protected] 1
Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guangxi Institute of Botany Guilin 541006, China
resistant germplasms, and the resistance of most Actinidia species has long been poorly understood (Wang et al. 2019, 2020), which has resulted in few studies on the evaluation and uti
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