Abstract
Plant pathogens infect plants by various routes from all the environments surrounding plants, such as wind, rain, soil, and when insects contact plants to suck on them or feed. Many pathogens invade through wounds or natural openings (stomata, water pores, etc.), and actively enter the plant body. Such invasion can occur regardless of the stage of host plant growth and development. However, some pathogens take advantage of the timing of plant reproduction, such as pollination and seed formation, to invade plants. These pathogens do not immediately cause disease in the host plants, but multiply insidiously in floral organs and seeds before developing the disease. At present, with both pollen and seeds distributed internationally for commercial use, there is an increasing risk of widespread transmission of pathogens along with pollen or seeds. Of the pathogens that cause pandemics, this study is focused on phytopathogenic bacteria that infect floral organs and seeds, and I introduce the ecology of their plant infection and relationships with other indigenous bacteria.
