Effects of controlled post-flowering temperature and daylength on chemical composition of four black currant ( Ribes nigrum L.) cultivars of contrasting origin

Qualitative Properties of the Fruits of Blackcurrant Ribes Nigrum L. Genotypes in Conventional and Organic Cultivation

“…The genotypes with large berries, such as 'Intercontinental', 'Karri' and 'Mairi' had a significantly lower fruit weight in the organic cultivation method as compared to the conventional, and in previous studies 'Intercontinental' has shown high yearly differences as well (Kaldmäe et al, 2013). Trials in Norway have revealed the positive effect of precipitation and the negative impact of temperature on fruit weight (Woznicki et al, 2015a), which correspond to our results. Blackcurrant berries were lighter in weight in 2011 when compared to 2012, probably due to low precipitation rate in June and July followed by the relatively high temperatures in July (Table 2), which affected fruit growth.…”

“…On the one hand, according to the investigations of Vagiri (2013; in Sweden, the accumulation of AsA increased in areas with warmer weather conditions when compared to the berries grown in cooler conditions. On the other hand, experiments conducted in Finland, Norway and Estonia obtained opposite results (Zheng et al, 2012(Zheng et al, , 2009bKaldmäe et al, 2013;Woznicki, 2015a).…”

Ascorbate pool, sugars and organic acids in black currant (Ribes nigrum L.) berries are strongly influenced by genotype and post‐flowering temperature

“…In an 8‐year field study carried out in Norway, we found that the berry concentration of AA in black currant was negatively correlated with summer temperature, whereas precipitation had the opposite effect . In a recent study, we further reported that the berry concentration of AA decreased with an increasing temperature over the temperature range 12–24 °C also under controlled environment conditions, whereas photoperiod had no significant effect. By contrast, a positive relationship between post‐flowering temperature and AA concentration was observed during a long‐term field experiment conducted in the UK .…”

“…The origin of the four cultivars used, and their cultivation during plant raising and experimentation, as well as the physical conditions in the daylight phytotron where the experiment was conducted, have all been explained in detail in an earlier study . The cultivars were the high‐boreal Russian cultivar Imandra (IM), originating from the Kola Peninsula (67°30′N), Hedda (HE) and Narve Viking (NV) from the Norwegian breeding program at Ås (59°40′N) and Ben Tron (BT) from the Scottish breeding program in Dundee (56°30′N).…”

“…However, it is difficult to interpret the specific effect of the various climatic factors under field conditions where simultaneous changes in several factors usually take place, resulting in complex covariations. The untangling of this complexity will usually require deeper analyses under controlled environment conditions …”