Ultrastructural changes in chloroplasts of mesophyll cells of chlorotic and prematurely yellowed leaves of Betula pendula Rothr.

• Autorzy: Przybyl K. , Idzikowska K.
• Języki publikacji: EN

Abstrakty

EN

The ultrastructure of chloroplasts was studied in mesophyll cells of the leaves of silver birch (Betula pendula) showing interveinal chlorosis or premature yellowing, in comparison with leaves without symptoms or exhibiting symptoms of natural senescence. The leaves were collected between May 26 to June 7 and additionally in the September 10-12 from the upper part of the crown, from increments of the past four years. No major difference in ultrastructure of chloroplasts was found between spongy and palisade mesophyll cells. The following senescencerelated changes were observed in chloroplasts of prematurely yellowed leaves and showing inteveinal chlorosis: reduced chloroplast size, degeneration of the membrane systems of thylakoids and increased electron density of plastoglobuli. The most electron dark globules (lipid droplets) were found together with starch grains in cells of spongy mesophyll of leaves showing interveinal chlorosis. Abnormal, spherical and rounded chloroplasts with electron-dark inside of thylakoids or the electron-dark stroma between thylakoids were found only in yellowed and chlorotic leaves in spring.

PL

Słowa kluczowe

EN

plant disease; premature yellowing; silver birch; Betula pendula; ultrastructural change; chloroplast; mesophyll cell; chlorosis; leaf

• Wydawca: -
• Czasopismo: Acta Societatis Botanicorum Poloniae
• Rocznik: 2003
• Tom: 72
• Numer: 4
• Opis fizyczny: p.289-293,fig.,ref.

Twórcy

autor

Przybyl K.

• Polish Academy of Sciences, Parkowa 5, 62-035 Kornik, Poland

autor

Idzikowska K.