study on chlorophyll fluorescence at some romanian blueberry cultivars growing on three planting substrates

• Published in: Acta horticulturae no. 981; pp. 565 - 572
• Main Authors: Ancu, I, Mladin, P, Chiţu, V, Ancu, S
• Format: Journal Article
• Language: English
• Published: International Society for Horticultural Science 01-01-2013
• Subjects: blueberries; chlorophyll; cultivars; energy; fluorescence; leaves; peat; photosystem II; planting; sulfur
• ISSN: 0567-7572; 2406-6168
• DOI: 10.17660/actahortic.2013.981.91

Chlorophyll fluorescence is one of the indicators that provide information on stress factors of the plant, invasive method in, without disturbing the natural course of photosynthesis. In vivo chlorophyll fluorescence changes involve only localized in the photosystem II chlorophyll a (including the antenna). Thus, in vivo chlorophyll fluorescence can provide immediate information about the use and energy dissipation in the PSII. With OS-30 (Opti-Sciences) were determined in the leaves and fruit, the following indicators: the minimum fluorescent (Fo), the fluorescent maximum (Fm), fluorescent momentary (Ft) and ratio Fv/Fm. The study was conducted in an experimental plot in the first three years after planting using the following experi¬mental scheme: A Factor, cultivars, with four graduations: a1= ‘Simultan’, a2= ‘Compact’, a3= ‘Delicia’ and a4= ‘Blueray’, B Factor - planting substrate, with 3 graduations: b1= 5 kg peat + 5 kg manure; b2= 10 kg coniferous litter; b3= 5 kg peat + 5 kg manure + 40 g sulphur powder; C Factor- foliar fertilization, with 2 graduations: c1- foliar fertilization with product Microfert U 0.3% conc., c2- non foliar fertilization (treated with water). On the average for three planting substrates and two foliar fertilization treatments, the four studied cultivars showed no significant differences between them. At the end of foliar fertilization in the leaves on the b1 substrate foliar fertilization with product Microfert U, caused a decrease of minimum chlorophyll fluorescence indicator (Fo) by 14.1% at all cultivars studied versus unfertilized variant; the same situation is encountered on the substrate b3 where the difference is by 9.8%. On the b2 substrate foliar fertilization caused an increase by 12.9% of values to minimum chlorophyll fluorescence indicator (Fo) versus unfertilized variant.