Abstract
The nature of the symptoms induced in tobacco (Nicotiana tabacum cv. Xanthi nc.) by a severe (P6) or a mild (W) strain of cucumber mosaic virus (CMW) were compared. Under conditions optimal for symptom expression, leaf chlorophyll was reduced to 38 or 87% in systemically infected leaves after infection with CMV-P6 or -W respectively. Dark treatment did not affect virus replication but was only partially effective for suppressing the severe chlorosis.Iodine staining of leaves revealed no correlation between the severe CMV-P6-induced chlorosis and increased starch levels. However in CMV-W-infected plants only, starch ringspots, and sometimes necrotic ringspots, were seen in inculated leaves and narrow bands of tissue with a low starch accumulating activity were found in systemically infected leaves.Electron microscopy revealed that the severe chlorosis induced after systemic infection with CMV-P6 was principally associated with a reduction in the size of chloroplasts which contained fewer grana, rather thair disruption and/or excess accumulation of starch. In some cases myelin-like chloroplast-related structures were also seen.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
