Screening for high temperature tolerance in mulberry

P. Jomngam, J. Chumpookam
High temperature tolerance was evaluated in six mulberry cultivars: 1) ‘Taiwan Miaoli No.1’ (control), 2) ‘Taiwan Miaoli No.2’, 3) ‘Taiwan 108’, 4) ‘Taiwan 203’, 5) ‘Taiwan 228’, and 6) ‘Taiwan 46C019’ by determining chlorophyll fluorescence (Fv/Fm values). Mulberry leaves were treated in a dark-incubator at 25, 30, 35, 40, and 45°C for 72 h. Values of Fv/Fm were constant and maintained high after exposing to 25 and 30°C for 72 h (0.72 and 0.73, respectively). At 35 and 40°C, Fv/Fm values slightly decreased during treatment, while a more rapid decreased in Fv/Fm value occurred at 45°C. Fv/Fm values decreased as temperature and duration of treatment increased. High temperature tolerance cultivars were found in ‘Taiwan Miaoli No.1’ and ‘Taiwan Miaoli No.2’, which had high values of Fv/Fm (0.63 and 0.47, respectively) after exposing to 45°C for 7 h. In contrast, high temperature sensitive cultivars were ‘Taiwan 108’, ‘Taiwan 203’, ‘Taiwan 228’, and ‘Taiwan 46C019’ with Fv/Fm values lower than 0.30 after exposing to 45°C for 7 h.
Jomngam, P. and Chumpookam, J. (2019). Screening for high temperature tolerance in mulberry. Acta Hortic. 1245, 41-44
DOI: 10.17660/ActaHortic.2019.1245.6
high temperature, chlorophyll fluorescence, Fv/Fm values

Acta Horticulturae