不同生长点习性甘蓝型冬油菜抗寒性与生理生化特性关系OA

[Objective]To investigate the specific mechanism underlying the cold resistance habit of the growing point in winter Brassica na-pus,it is advisable to choose a cultivar with superior cold resistance for cultivation in the cold and dry regions of northwest China.[Method]This study utilized six winter rapeseed varieties with varying degrees of concave and convex growth patterns as experimental materials.The research focused on investigating the effects of low temperature stress on the growth habits,winter survival rates,root collar diameters,and the activity of cell protective enzymes(SOD,POD,CAT)as well as MDA content,soluble protein(SP)content,and free proline(Pro)content in the test materials.[Result]The activities of SOD,POD,and CAT enzymes,as well as the content of SP,Pro,and MDA,were higher in all parts of winter rapeseed plants with concave growing points compared to those with convex growing points.Moreover,the greater the degree of depression of the growing point,the larger the diameter of the root neck,the higher the content of chlorophyll a,and the overwintering rate.[Conclusion]Physio-logical and biochemical indexes are found to vary in response to the cold hardiness of winter rapeseed,reflecting differences in their growth habits.