Chilling injury in cotton (Gossypium hirsutum L.) : Effects of antimicrotubular drugs

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When exposed to 4℃ for more than three days, intact cotton (Gossypium hirsutum L.) seedlings and isolated cotyledonary discs suffered chilling injury as shown by the leakage of electrolytes from the tissue and the development of necrotic areas. Application of antimicrotubular drugs such as colchicine, demecolcine or podophyllotoxin during chilling significantly accelerated and enhanced tissue damage. Lumicolchicine, the stereoisomer of colchicine, was ineffective. Non-chilled tissues showed hardly any damage when treated with the same levels of antimicrotubular drugs. Prior treatment with 10^<-5> M abscisic acid (ABA) prevented the appearance of symptoms of damage caused by chilling and the antimicrotubular drugs during the first 2 to 3 days and greatly reduced it at later stages. Our present results suggest that chilling damage may be due at least in part, to the cold-induced disassembly of microtubules. Furthermore, the mode of action of ABA might be related to factors which influence the physiological stability of the microtubule network.
日本植物生理学会の論文