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Development of novel ways to address the losses and decreased production of onion in the Philippines due to diseases, has been of great interest since 1996. To achieve this, basic knowledge on the pathogenesis and host response are crucial in developing resistant varieties. Results generated from the pathogenicity test confirmed Colletotrichum gloeosporioides and Gibberella moniliformis are both pathogenic to the three onion cultivars tested (Yellow Granex, Red Creole and Shallot). Disease incidence and disease index were highest in Yellow Granex, followed by Shallot and Red Creole. Application of GA3 at 100 and 1000 µg/ml in the neck of onion plants produced severe twisting and elongation and microscopic examination showed that the cells are exceptionally long and wide as compared to the cells of the uninoculated plants. Biochemical analysis unveiled that protein content, amount of reducing and total sugars as well as phenols were low in all of the infected plants as compared to the uninoculated plants. A trend that shows a correlation between decreasing protein, sugar and phenols content and decreased resistance.

Pathological response and biochemical changes in Allium cepa L. (bulb onions) infected with anthracnose-twister disease