Author/Editor		Pompe-Novak, Maruša; Wrischer, Mercedez; Ravnikar, Maja
Title		Ultrastructure of chloroplasts in leaves of potato plants infected by potato virus Yntn
Type		članek
Source		Phyton-ann Rei Bot A
Vol. and No.		Letnik 41, št. 2
Publication year		2001
Volume		str. 215-26
Language		eng
Abstract		PVYntn infection has been shown to influence the ultrastructure of chloroplasts in primary infected potato plants (Solanum tuberosum L.) of cultivar Igor grown in vivo and secondary infected plants of cultivar Desiree grown in vitro. The ultrastructure is most affected in spot necrosis, where the changes are part of apoptotic processes. In the parts of inoculated leaves without spot necrosis, a decrease in size of chloroplasts was observed as compared to healthy controls. From the edge to the middle of a spot necrosis, swelling of chloroplasts, loosening of thylakoid structure and changes in optical density of chloroplasts were followed. In the middle of spot necrosis the cytoplasm of the cells was dense, no vacuoles were present in the cells, cells were shrunk, the cell wall was wrinkled and the intracellular spaces were enlarged. An increase in the number of chlornplasts per cell was observed in the green parts of yellow-green leaves as compared to healthy controls. Secondary infected plants grown in vitro had smaller chloroplasts with exvaginations, but the same volume proportion of thylakoids, starch grains and osmophilic globuli as in chloroplasts of healthy plants. (Abstract truncated at 2000 characters)
Descriptors		POTATOES POTYVIRUS PLANT LEAVES CHLOROPLASTS