Hong-Ren Yang

Associate Researcher of

Chiayi Agricultural Experiment Station,

Taiwan Agricultural Research Institute

Phone:886-5-2771341 ext 239

Fax:886-5-2773630

E-mail:yhr@ms3.hinet.net

Education

BS（1984）in Plant Pathology, National Taiwan University

Ph. D.（1989）in Plant Pathology, National Taiwan University

Area of Research Interest

Plant Pathology, Fruits diseases, Postharvest diseases

Publication

Journal papers

1. Yang, H.R., and Chuang, T.Y. 1991. Variation of Colletotrichum musae in Taiwan. Plant Prot. Bull. 33:262-274.

Abstract:

Based on the appearance characteristics on PDA at 25 ℃ in the dark, 66 isolates of Colletotrichum musae obtained from banana fruit in Taiwan were divided into three groups, designated as A, B, and C. Group A is characterized by orange colony with white scant mycelium and dense orange conidial ooze; group B is by pink colony with pale-gray mycelium, scant orange conidial ooze and sclerotia appeared; group C is by gray-black colony with gray mycelium, scant orange conidial ooze and sclerotic appeared. These three groups were not able to be distinguished clearly with the patterns of soluble protein and esterase isoenzyme, or the characteristics of growth on different media, at different temperatures or under different pH. Compared with group A, group B and C were more virulent to banana fruit.

2.Chuang, T.Y., and Yang, H.R. 1993. Biological control of banana anthracnose. Plant Pathol. Bull. 2:71-77.

Abstract:

4 Bacterial isolates and 5 yeast isolates were consistently effective to inhibit anthracnose lesion expansion on ripe banana fruit by 22-43% and 32-42%, respectively. For control of banana anthracnose from natural infection, one isolate of bacterium and two isolates of yeast were able to reduce lesion numbers on banana fingers consistently.

3.Yang, H.R. and Chuang, T.Y. 1994. Pathogenicity and zymogram of anthracnose fungi isolated from some fruits. Memoris of the Colledge of Agriculture NTU 34:1-8.

4.Yang, H.R. and Chuang, T.Y. 1996. The nutrient effect on the appressoria behavior and latent infection of Colletotrichum musae. Plant Prot. Bull. 38:247-259.

Abstract:

There are no differences between the rates of conidial germination and appressorial formation of Colletotrichum musae on the peel of green and ripe banana. Appressoria formed from conidia directly with no germ tube on the PDA amended with 100000ppm tannin. Appressoria can stand high concentration of 10000ppm tannin and dryness for more than 60 days. The leachates from banana markedly increased 10 days after ripening, carbohydrates increased 85 times and the proteins increased 12 times. Using the glucose and asparagine to replace carbohydrates and proteins , respectively, in the leachate of banana peel. The results showed that low concentration of nutrient leachated from banana peel 9 days after ripening only stimulated conidial germination and appressorial formation but not mycelial growth on the millipore membrane placed on the agarose plate, but high concentration of nutrient leachated from the banana peel 10 days after ripening was capable of enhancing mycelial growth and inhibiting appressorial formation. Dripping to remove leachates from the surface of banana peel with sterilized water might also delay infection.

5.Liu,Sin-Yie, Wang, Jan-Yueh, Shyu, Yuan-Tyan, Hu, Min-Fu, Yang, Hong-Ren and Ho, Chyi-Chen. 1996. The development of yam new variety Tainung No. 2. Jour. Agric. Res. China 45:260-284.

6. Yang, H.R. and Lin, Y. T. 1997. Effect of hot water treatment for controlling anthracnose of mango fruits of Tannung No. 1 variety. Plant Prot. Bull. 39:241-249.

Abstract:

Appressoria of Colletotrichum gloesporioides formed on the cellophane were sipped into hot water with different temperature for 5 minutes. The ability of fungal regrowth on acidified PDA was completely inhibited by the treatment with hot water higher than 49℃.The fruits of mango Tainung NO. 1 variety were dipped into the 53℃ hot water for 5 minutes and then ripened. The percentage of treated fruits at 4th day after hot water treatment with ＜3 lesions was 90%, 100% and 96.7% in three trials, respectively, and 34.5%, 5%, 43.3% in untreated fruits, and 0% for all untreated fruits at 7 days after treatment in the 3 trials, respectively. The average number of lesions per fruit was 23.4, 26.7 15.2 for untreated fruits and 2.7, 2.2, 5.3 for the treated fruits at the 7th day after treatment in three trials. There was no heat damage on the appearance of fruits after hot water treatment.

Conference paper

1.Yang, Hong-Ren & Chung, Tsai-Young. 1989. Role of nutrient on the latent infection of banana caused by Colletotrichum musae. Plant Prot. Bull. 31:404.

2.Yang,H.R. and Chung, T. Y.1992. The Interaction of Nutrient and Tannin on appressorial behavior of Colletotrichum musae. Plant Prot. Bull.34:347.

3.Chern,Lih-ling,Ann,Pao-jen, and Young, Hong-Ren. 1996. Foot and root rot of loquat caused by atypical Phytophthora parasitica. Plant Pathol. Bull. 5: 200 .

Proceedings

1. Chuang, T.Y. and Yang, H.R. 1997. Effect of weather on the development of banana leaf spot. Proceedings of the symposium on climatic effects on the occurrence of plant diseases and insects p.49-63.