The Physiological Property Variation of Early Allopolyploidy Generations in Arachis Interspecific Hybridization
To study the mechanisms of genetic variation on physiological property of Arachis allopolyploidization,the variation characteristics of physiological and biochemical indexes related to disease/stress resistance(POD activity, Proline, MDA, soluble sugar and chlorophyll content) was studied using the progenitors, F1 hybrid and early polyploidy generations(S0to S3) of the hybridization between tetraploid cultivated peanut and diploid wild peanut A. doigoi as materials. The results indicated that:(1)All the five physiological property indexes of F1 hybrid were higher than their progenitors, which showed obviously heterosis;(2)After chromosome doubling, POD activity,Proline and chlorophyll content of S0~S1were higher than F1hybrid;(3)All the five physiological property indexes of S1~S3declined along with the self-cross course but higher than their progenitors, which indicated that allopolyploidy had better environment suitability and resistance capability to disease resistance and drought tolerance.This study provided useful important information for revealing the mechanism of peanut allopolyploidy evolution.Additional, it had vital significance to guide the peanut interspecific hybridization breeding.