VIEW ARTICLE

Effect of Bean Leaf Detachment on Susceptibility to Tobacco Mosaic Virus Infection. Yoichi Nakagaki, Plant Pathology Laboratory, Faculty of Agriculture, Nagoya University, Chikusa, Nagoya, Japan; Chiaki Matsui, Plant Pathology Laboratory, Faculty of Agriculture, Nagoya University, Chikusa, Nagoya, Japan. Phytopathology 61:354-356. Accepted for publication 19 October 1970. DOI: 10.1094/Phyto-61-354.

The number of lesions developed on bean leaves detached 18 hr before inoculation with tobacco mosaic virus (TMV) was twice the number that developed on attached leaves. Fewer lesions developed on leaves detached 48 hr prior to inoculation than on inoculated attached leaves. The number of lesions on leaves detached 1 hr after inoculation was 54% more than developed on leaves left on the plant. Thirty per cent more were present when detachment after inoculation was delayed 2-18 hr. Since the lesions developed on the leaves detached 6 hr after inoculation were nearly the same as those on the leaves detached 24 hr after inoculation, leaf detachment probably affects lesion formation and virus multiplication, but not the establishment of infective centers. Moderate leaf senescence before and after inoculation stimulates the leaf susceptibility to TMV infection and TMV multiplication within the lesions.