Blackberry link 567/26/2023 ![]() ![]() To counter light stress and prevent damage, plants use redox signaling and signal transduction pathways to elicit photoprotective measures and acclimate to persistent high light conditions ( Foyer et al., 2017 Matsubara et al., 2016), but relatively little information exists on the performance of cultivated Rubus spp. High irradiance is known to cause excess excitation energy in the light harvesting systems and reduce the efficiency of photosystem II ( Barber, 1995 Powles, 1984). Furthermore, the interception of light beyond the maximum capacity of the photosystems or photoprotective measures of the plant may induce oxidative stress before visible damage ( Mullineaux and Karpinski, 2002). ![]() Field plantings are often designed to achieve maximum light interception depending on the latitude of production ( Pritts and Hanson, 2017), although high irradiance combined with high temperature is known to lead to fruit sunscald, leaf burn, an increase in the incidence of white drupelet disorder ( Finn and Clark, 2017 Takeda et al., 2013), and occasionally total plant collapse ( Finn and Clark, 2011). exhibit plasticity with respect to architecture and leaf physiology under different levels of irradiance ( Gallagher et al., 2015). Numerous breeding efforts have improved fruit flavor, size, and shelf life, and there is a continued interest in improving plant traits, such as a greater tolerance to cold temperatures during flowering and tolerance to intense sunlight ( Clark and Finn, 2008 Takeda et al., 2013). Keywords: dark respiration light compensation point light saturation point photosynthetic capacity Rubusīlackberry ( Rubus subgenus Rubus Watson) production has greatly increased since 2005 in North America, Central America, Australia, and Europe as a result of newly developed floricane-fruiting and primocane-fruiting cultivars from both university and private breeding programs, development of marketing outlets, and an increase in fresh-market consumption ( Clark and Finn, 2014 Hall, 2017). Based on the cultivar-specific performance observed, blackberry response to light is a relevant trait that breeding programs should consider for improving cultivar adaptability to local and regional conditions. Of the four cultivars, Apache, Navaho, and Von appeared to be more photosynthetically limited than Natchez under increasing irradiance. The BH response curves declined under the highest irradiance measured, whereas the PH and AH response curves remained stable at similarly high irradiance. During AH, all cultivars had a similar P Nmax. The estimated maximum photosynthetic rate (photosynthetic capacity, P Nmax) was greater BH than AH across all cultivars, whereas ‘Natchez’ had a greater P Nmax BH and PH compared with the other cultivars. Each cultivar was evaluated between an irradiance of 2000 and 0 μmol In this experiment, light response curves of floricane leaves from the cultivars Natchez, Apache, Navaho, and Von were examined throughout the following production stages: before shiny black fruit were present (before harvest, BH), during peak production of fruit (peak harvest, PH), and when most fruit had fallen from plants or any remaining were dull black (after harvest, AH). ![]() subgenus Rubus Watson) is largely unexplored, although they are frequently grown in full sun. The photosynthetic light response of commercial blackberry cultivars ( Rubus L. ![]()
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