Naslov
Efficiency of the photosynthetic apparatus in developing needles of Notway spruce (Picea abies L. Karst)

Autori
Lepeduš, Hrvoje ; Fulgosi, Hrvoje ; Benšić, Mirta ; Cesar, Vera

Izvornik
Acta Biologica Hungarica (0236-5383) 59 (2008), 2; 217-232

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

Ključne riječi
Picea abies ; chloroplast biogenesis ; photosynthesis ; needle development

Sažetak
The photosynthetic performance of developing spruce (Picea abies L. Karst) needles was investigated. As revealed by previous reports, the biosynthesis of chlorophylls and carotenoids was not following the characteristic chloroplast ultrastructure building up during needle elongation proces. The aim of our study was to investigate photosynthetic capability (evaluated by oxigen evolution and chlorophyll a fluorescence kinetics measurements), the dynamicsof chloroplast pigments biosynthesis and the expression of major photosynthetic proteins as well as to find out possible correlation between components of issue. Low amounts of chlorophylls and carotenoids, LHC II and Rubisco LSU were detected in the embryonic shoot of vegetative buds. Altohough PS II was functional, oxygen production was not sufficient to compensate for respiration in the same developmental stage. The light compensation point of respiration was successively lowered during the needle elongation. Nevertheless the significant increase in photosynthetic pigments as well as the high level of expression of LHC II and Rubisco LSU proteins was observed in the later stages of needle development. Our results suggest that, besides light, some other environmental factors could be critical for producing fully functional chloroplasts in rapidly growing young needles.

Izvorni jezik
Engleski

Znanstvena područja
Matematika, Biologija, Poljoprivreda (agronomija)

POVEZANOST RADA