Central role of the flowering repressor ZCCT2 in the redox control of freezing tolerance and the initial development of flower primordia in wheat

摘要: Background: As both abiotic stress response and development are under redox control, it was hypothesised that the pharmacological modification of environment would affect initial flower primordia freezing tolerance in wheat (Triticum aestivum L.). Results: Pharmacologically induced changes were monitored winter (T. ae. ssp. cv. Cheyenne, Ch) spring spelta; Tsp) genotypes grown after germination at 20/17°C for 9 d (chemical treatment: last 3 d), then 5°C 21 first 4 d) subsequently (recovery period). Thiols their disulphide forms measured based on these data reduction potentials calculated. In freezing-tolerant Ch chemical treatments generally increased amount thiol disulphides potential days 20/17°C. freezing-sensitive Tsp a similar effect chemicals parameters only observed continuation 5°C. The applied slightly decreased root fresh weight Ch, whereas they shoot shown 3-week recovery 20/17°C, accelerated Tsp, not affected by Ch. differently expression ZCCT2 several other genes related to Conclusions: Various redox-altering compounds osmotica had differential effects glutathione content potential, consequently flowering repressor Tsp. We propose higher may be associated with activation cold acclimation its lower induction accelerating primordia. addition, involved coordinated control two processes.