REAL

PSII photochemistry in vegetative buds and needles of Norway spruce (Picea abies L. Karst.) probed by OJIP chlorophyll a fluorescence measurement

Katanić, Zorana and Atić, Lejla and Ferhatović, Dž. and Cesar, Vera and Lepeduš, H. (2012) PSII photochemistry in vegetative buds and needles of Norway spruce (Picea abies L. Karst.) probed by OJIP chlorophyll a fluorescence measurement. Acta Biologica Hungarica, 63 (2). pp. 218-230. ISSN 0236-5383

[img] Text
abiol.63.2012.2.5.pdf
Restricted to Repository staff only until 30 June 2032.

Download (406kB)

Abstract

Vegetative buds represent developmental stage of Norway spruce (Picea abies L. Karst.) needles where chloroplast biogenesis and photosynthetic activity begin. We used the analyses of polyphasic chlorophyll a fluorescence rise (OJIP) to compare photosystem II (PSII) functioning in vegetative buds and fully photosynthetically active mature current-year needles. Considerably decreased performance index (PI<sub>ABS</sub>) in vegetative buds compared to needles pointed to their low photosynthetic efficiency. Maximum quantum yield of PSII (F<sub>v</sub>/F<sub>m</sub>) in buds was slightly decreased but above limited value for functionality indicating that primary photochemistry of PSII is not holdback of vegetative buds photosynthetic activity. The most significant difference observed between investigated developmental stages was accumulation of reduced primary quinine acceptor of PSII (Q<sub>A</sub><sup>−</sup>) in vegetative buds, as a result of its limited re-oxidation by passing electrons to secondary quinone acceptor, Q<sub>B</sub>. We suggest that reduced electron transfer from Q<sub>A</sub><sup>−</sup> to Q<sub>B</sub> could be the major limiting factor of photosynthesis in vegetative buds.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz
Depositing User: Ágnes Sallai
Date Deposited: 05 Jan 2018 09:57
Last Modified: 05 Jan 2018 09:57
URI: http://real.mtak.hu/id/eprint/72010

Actions (login required)

Edit Item Edit Item