Characteristics of respiratory metabolism during Avrolles＇ imposed dormancy

Abstract：In order to provide physiological bases for selecting late-germination cultivars that can avoid late frost damage, the very late-germination cultivar Malus domestic cv. Avrolles and the control cultivar M. domestic cv. Judeline were used as experimental materials to investigate the characteristics of the respiratory metabolism, the changes of respiratory pathway, respiratory rate and the key enzyme activity during imposed dormancy. The results showed that： changes of respiratory pathway in buds of Avrolles and Judeline had the same trend, but the running activity and time processing of the change were significantly different between the two varieties. The total and EMP respiration intensity of Avrolles were less than that of Judeline, the peak value was 84.6% and 84.7% respectively. Time for PPP accumulation in Avrolles was 21 days longer than that in Judeline, the running activity was higher and the amplitude was 2.02 times as that in Judeline. The activity of key enzymes and content of respiratory substrates in Avrolles were lower than that in Judeline. The energy provided by respiratory metabolism was not sufficient, which limited the ~ermination of Avrolles.