Effects of low-temperature acclimation on morphological and physiological indices of banana seedlings
DOI:
https://doi.org/10.9755/ejfa.2022.v34.i5.2868Abstract
Climate change has become the most important factor limiting the banana cultivation area, especially in countries with subtropical
climates. To assess the effect of cold stress on banana, twenty-eight global and local cultivated clones were used for morphological and
physio-biochemical evaluation. Methods: The banana clones were produced from shoot tips under in vitro conditions. When the plants were
20-25 cm in height and 5-6 leaves, they were transferred to climate-controlled rooms. The temperature of the testing room was gradually
decreased every three days (from 28ºC day/22ºC night to 4ºC day/-1ºC night). After the seedlings remained at these temperatures, the
temperature of the room was increased every three days (from 4ºC day/-1ºC night to 28ºC day/22ºC). When the treatment room reached
control room conditions (28ºC day/22ºC night), measurements and analyses were started. Results: Low-temperature stress decreased
pseudostem length, pseudostem diameter, leaf area, and leaf number of banana clones. The malondialdehyde contents (MDA) were
increased compared with control; the chlorophyll content and fluorescence decreased significantly. When temperatures return to normal
conditions (28ºC day/22ºC night), only eight banana clones managed to survive and twenty banana clones irreversibly died. After a
gradual increase in temperatures, plants have continued to live and form new leaves. Conclusion: At the end of study, it was understood
that the low temperatures applied would be sufficient to determine the low-temperature tolerance in banana clones and could work at
lower temperatures