P-294 - Susceptibility of different passion fruit root stocks to potyviruses/fungal pathogens and potential treatments of improving plant resistant capacity

Tuesday, August 5, 2025

9:30 AM - 10:15 AM HST

Location: Exhibit Hall 3

Presenting Author(s)

CL

Ching- yi Lin

Chiayi Agricultural Experiment Branch, Taiwan Agricultural Research Institute (TARI)
Chiayi, Chiayi, Taiwan (Republic of China)

Author(s)

CC

Chin-Chih Chen

Associate Researcher
TARI
Taichung, Taichung, Taiwan (Republic of China)
JT

Jyh-Nong Tsai

TARI
Taichung, Taichung, Taiwan (Republic of China)
ML

Mei-Ju Lin

TARI
Taichung, Taichung, Taiwan (Republic of China)
TL

Tsung-Chun Lin

Associate Researcher
Taiwan Agricultural Research Institute
Taichung, Taichung, Taiwan (Republic of China)
CH

Chin-Cheng Hsu

TARI
Kaohsiung, Kaohsiung, Taiwan (Republic of China)
WL

Wen-Li Lee

TARI
Kaohsiung, Kaohsiung, Taiwan (Republic of China)
HT

Hui-Ling Tsai

TARI
Taichung, Taichung, Taiwan (Republic of China)
FC

Fen-Lan Chiang

TARI
Taichung, Taichung, Taiwan (Republic of China)

Abstract Text: Tainung No. 1 (TN1) passion fruit is currently the main variety in Taiwan and Asia. Through grafting, the excellent horticultural genetic characteristics of TN1 were maintained. The inoculation test was used to investigate the susceptibility of passionfruit rootstocks to three potyviruses-EAPV-AO and EAPV-IB of East Asian Passiflora virus (EAPV) and telosma mosaic virus (TeMV), and two fungal pathogens (Fusarium and Phytophthora). The results showed that the infection rate of viruses or fungi depends on the rootstock seedlings from different sources. TeMV has the highest infection rate ranging from 5-92%, while EAPV-AO and EAPV-IB have their infection rates ranging from 0-50%. When the virus was only inoculated on leaves of the root stock, it could migrate to the scions and raise the detection rate of EAPV-AO, EAPV-IB and TeMV in scions which were 36%, 50% and 40%, respectively. Our results revealed that rootstock leaves provide a better way to inoculate passion fruit virus. By fungal inoculation, the resistance capacities of passionfruit seedlings to Fusarium and Phytophthora could be raised to 60-80% when the seedlings were propagated from the seeds of those plants survived from the first inoculation. We also used microorganism to reduce the infection rate of TeMV in rootstock seedlings, the incidence rate without microbial treatment of was 60%, but was 0-20% for treatments with microorganisms. Therefore, the pressure selection method (by fungal inoculation) and the microbial treatment have the potential to improve the resistance capacities of passionfruit plants.