Improved tolerance toward low temperature in banana ( Musa AAA Group Cavendish Williams)

• Published in: South African journal of botany Vol. 78; pp. 290 - 294
• Main Authors: Zhang, J.Z., Zhang, Q., Chen, Y.J., Sun, L.L., Song, L.Y., Peng, C.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2012
• Subjects: Adaptations; Ascorbate peroxidase; Banana; bananas; Catalase; cold tolerance; cultivars; Enzymes; Hydrogen peroxide; L-Ascorbate peroxidase; Leaves; Malondialdehyde; Musa; Oxidative stress; Peroxidase; Photosynthesis; Radicals; Reactive oxygen species; Superoxide dismutase; temperature; Temperature tolerance; Reactive oxygen species; Catalase; Superoxide dismutase; Peroxidase; Ascorbate peroxidase; Photosynthesis; Banana
• ISSN: 0254-6299; 1727-9321
• DOI: 10.1016/j.sajb.2011.08.002

To further understand the physiological mechanisms of cold-tolerance in banana plants, the responses of four introducing cultivars (
cv.) W811 (via long-term cold adaptation), PB, BJ10 and BJ11 to low-temperature stress (LT) were investigated. LT caused increased malondialdehyde (MDA) content, elevated contents of hydrogen peroxide (H
2O
2) and superoxide radical (O
2
−), and decreased photochemical efficiency (
F
v/
F
m) and net photosynthetic rate (
P
n) in the leaves of four banana cultivars, but
cv. W811 showed better LT tolerance than the other three cultivars. After 72
h of LT, four key antioxidative enzymes in the four cultivars showed different responses. Compared to controls, superoxide dismutase (SOD) activities in the four cultivars showed a significant decrease and W811 had the smallest amount of decrease. Catalase (CAT) activities showed a significant decrease. Peroxidase (POD) activities kept relatively higher activities and showed no significant changes (P
>
0.05) in W811, BJ10 and BJ11 whereas that in PB showed a significant increase (P
<
0.001). Ascorbate peroxidase (APX) activities in W811 and PB showed no significant changes (P
>
0.05). Our results showed that higher cold-tolerance in
cv. W811 may correlate with the long-term cold adaptation of the antioxidative enzymes such as SOD, POD and APX that alleviate oxidative stress caused by LT.
► Four banana cultivars including W811 (via long-term cold adaptation) were studied. ► Relationship between cold-tolerance and long-term cold adaptation was investigated. ► It can promote banana productivity via cultivating cold-resistant variety. ► Cold-tolerance may be related to long-term cold adaptation of antioxidant enzymes.