Naslov
Chloroplast structure and function in wild-type and aurea-type leaves of the Japanese spindle-tree over their life span

Autori
Ljubešić, Nikola ; Wrischer, Mercedes ; Prebeg, Tatjana ; Devide, Zvonimir

Izvornik
Acta Botanica Croatica (0365-0588) 62 (2003), 1; 1-10

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Euonymus japonicus; wild-type plant; aurea-variety; overwintered leaves; chloroplast; ultrastructure; photosynthesis

Sažetak
The evergreen leaves of the Japanese spindle-tree (Euonymus japonicus Thund "Aureomarginatus") are adapted to endure repeated freezing and thawing during the winter. We investigated the physiological and morphological characteristics of the chloroplasts in young, overwintering, and overwintered wild-type and aurea-type leaves. When developing in the shade, both leaf types during their life span maintained a well-develpoed thylakoid system in their chloroplasts. The photosynthesis rates were also similar. When growing in intense sunlight, the aurea ariety contained chloroplasts with a reduced thylakoid system, but photosynthesis was less reduced. In spring, overwintered leaves of both varieties clearly showed ultrastructural and physiological characteristics of senescence. The senescence of aurea leaves exposed to full sunlight was more pronounced.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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