Abstract
Strawberry (Fragaria ananassaDuch. cv. Fengxiang) plantlets were cultured under two in vitroenvironments for rooting, and then acclimatized under two ex vitroirradiance conditions. At the end of rooting stage plant height, fresh weight and specific leaf area of T1-plants grown under high sucrose concentration (3 sucrose), low photosynthetic photon flux density (30 μ mol m−2 s−1) and normal CO2 concentration (350–400 μl l−1) were significantly higher than those of T2-plantlets grown under low sucrose concentration (0.5), high photosynthetic photon flux density (90 μ mol m−2 s−1) and elevated CO2 concentration (700–800 μl l−1). But T2-plantlets had higher net photosynthetic rate (Pn), effective photochemical quantum yield of PSII (ΦPSII), effective photosynthetic electron transport rate (ETR), photochemical quenching (qP) and ratio of chlorophyll fluorescence yield decrease (Rfd). After transfer, higher irradiance obviously promoted the growth of plantlets and was beneficial for the development of photosynthetic functions during acclimatization. T2-plantlets had higher fresh weight, leaf area, ΦPSII and ETR under higher ex vitroirradiance condition.
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