摘要:

The fine structure of the haustorium of the pycnio-aecial stage ofMelampsora pinitorquain infected cells of cotyledons ofPinus pineawas studied. Some features were found to be different from those of the uredial-telial stage of the same rust onPopulus tremula.The mother cell wall lacked thichening at the penetration site; the penetration site was found to be very wide; the mother cell wall was continuous with the haustorial wall and the fungal wall was clearly distinct from the host wall; the haustorium had a hypha-like shape and a septum in its proximal region. The interface between the haustorium and the host cell, and the relationship of some host organelles with the haustorium appeared similar to those of the uredial-telial stage ofMelampsora pinitorquaon aspen.

ISSN:0008-7114    

DOI:10.1080/00087114.1975.10796627

出版商:Taylor & Francis    

年代:1975

数据来源: Taylor

摘要:

Most chloroplasts inArisarum proboscideum(L.) Savi show one or two stromatic protrusions, which may be short and thick but also very long and thin. Thylacoids have never been observed in the matrix of these protrusions, whereas small vesicles are often present whose membrane sometimes appears to be continuous with the inner membrane of the chloroplast envelope. Frequently, near to the chloroplast ends, dep hollows are present which include a conspicuous portion of cytoplasm, generally with mitochondria. In many instances, formations with the same structural features as the protrusions are found close to the chloroplasts but separate from them. Such phenomena were observed in sections of leaves of different ages and on isolated chloroplasts as well, both sections and in replicas of freeze-etched samples. The same phenomena, sometimes even in a more striking form, also occur inArisarum vulgareTarg. Tozz.,Arum italicumMill.,A. maculatumL.,A. pictumL. f.,Dracunculus vulgarisSchott andZantedeschia aethiopicaSpreng. The functional significance of these protrusions, which inArisarum proboscideumare the rule rather than the exception, is possible to be related to the close spatial relationship between chloroplasts and mitochondria. The protrusions could be regarded as the expression of a tendency of the chloroplast to extend its outer surface, which fact could favour metabolic exchanges between functionally cooperating organelles.

ISSN:0008-7114    

DOI:10.1080/00087114.1975.10796628

出版商:Taylor & Francis    

年代:1975

数据来源: Taylor

ISSN:0008-7114    

DOI:10.1080/00087114.1975.10796629

出版商:Taylor & Francis    

年代:1975

数据来源: Taylor