Vol. 84 No: 2

Title:
Photosynthetic performance and stomatal characteristics during ex vitro acclimatisation of true service tree (Sorbus domestica L.)

Authors:
JAROSLAV ĎURKOVIČ, ALŽBETA LENGYELOVÁ, INGRID ČAŇOVÁ, DANIEL KURJAK and DRAHOMÍRA HLADKÁ

pp: 223-227

Abstract:
Mortality rates of micropropagated plantlets after transfer to an ex vitro environment are often high. The temporal pattern of developmental changes was examined in a slow-growing true service tree (Sorbus domestica L.) in relation to its photosynthetic and stomatal characteristics. The rates of net photosynthesis (P_n), transpiration (E), and stomatal conductance (g_s), the maximum photochemical efficiency of photosystem II (F_v/F_m), potential electron capacity (‘area’), maximum-to-initial fluorescence ratio (F_m/F₀), as well as stomatal densities and sizes, were determined over the course of a 63-day acclimatisation period. In vitro-rooted plantlets were photosynthetically competent. A sudden decrease in P_n was observed 7 d after transfer. The recovery of P_n took place within the next 28 d, and the rate remained steady until the end of acclimatisation. The most prominent changes in the F_v/F_m and F_m/F₀ ratios were found between days-7 and -35. Full acclimatisation was achieved 63 d after transfer. This stage was associated with the lowest values of E, g_s, and stomatal density, as well as the highest values of F_v/F_m, ‘area’, F_m/F₀, and stomatal size.

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