Journal Of Applied Horticulture ISSN: 0972-1045


John H. Mirandaand Richard Williams

School of Agronomy and Horticulture Science, The University of Queensland, Gatton, Qld.4343, Australia. Present address: Brisbane South Lifestyle Support Services, 48 Duke Street Kangaroo Point, Q 4169

Key words: Carbon dioxide enrichment, air flow, photo system II, photochemical efficiency of PS II (FV/FM), photosynthetic photon flux (PPF), photoinhibition, dry weight, chlorophyll and nitrogen.

Journal of Applied Horticulture, 2007, volume 9, issue 1, pages 13-16.

Abstract: The influence of light quality and carbon dioxide concentration on the development of photosynthetic functional structures of strawberry leaves in vitro was examined. We assessed the photochemical quenching parameter of chlorophyll a photochemical efficiency of photo system II (PSII) of strawberry leaves in vitro in a factorial set up. The main effects of light quality; averaged over CO2 enriched, air flow and closed systems, increased the initial chlorophyll fluorescence value from 485 for yellow light developed PS II system of leaves to 1142 for white light (control) developed ones. The photochemical efficiency of PSII significantly increased from 0.64 under white light to 0.80 for yellow light developed leaves. The leaves developed under blue light were similar to that of control white light for many chlorophyll fluorescence parameters except the initial chlorophyll fluorescence level. The increase in photochemical efficiency of PSII of strawberry leaves can be attributed to lower initial fluorescence values. Under blue light the total dry weight and total chlorophyll content were increased. The possible role of high mercury peak of white light and photoinhibition during development in vitro is discussed.

Developmental influence of in vitro light quality and carbon dioxide on photochemical efficiency of PS II of strawberry leaves (Fragaria x ananassa)

Journal of Applied Horticulture