Study on Difference of Seedling Growth and Physiological Characteristics Between Three-way Cross Rapeseed and Its Parents Under Different Water Stress
Drought and flood disasters have a significant impact on rapeseed production,seriously affecting its yield and quality.This study used a pot experiment to study the effects of normal water content(control),mild waterlogging,moderate waterlogging,moderate drought,and severe drought conditions on growth and physiological characteristics of the three-way cross rapeseed'159-6'×'Fengyou 520',its parent'Fengyou 520'(20A×C3R)and'159-6'.The results showed that under normal water conditions,the fresh weight of three-way cross rapeseed was higher than that of hybrid parents and inbred line parents,and CAT activity was higher than that of inbred line parents.The dry weight,chlorophyll content,SOD and POD activity were significantly lower than those of both parents(p＜0.01).Under different degrees of waterlogging and drought stress,the chlorophyll content of three-way cross rapeseed was higher than that of thecontrol,and significantly higher than that of its parents(p＜0.05).The dry weight of three-way cross rapeseed under mild waterlogging and severe drought stress was 80% and 20% higher than that of its hybrid parents,and 200% and 100% higher than that of its inbred parents,reaching a highly significant level(p＜0.001).Under mild waterlogging and moderate drought stress,the SOD activity was 44.8% and 62.1% higher than the hybrid parents,and 179.9% and 48.7% higher than the inbred parents,reaching a highly significant level(p＜0.001).The POD activity under moderate and severe drought stress was 64.1% and 22.6% higher than that of hybrid parents,154.2% and 91.1% higher than that of inbred parents,reaching a highly significant level(p＜0.001);Under severe drought stress,the soluble sugar content was 46.9% higher than that of the hybrid parent,reaching a significant level(p＜0.05).Three-way cross rapeseed has better waterlogging resistance and drought resistance compared to its parents.Three-way cross rapeseed has significant advantages over its parents under different water stress.This study can provide reference for the breeding and large-scale promotion of new varieties of waterlogging and drought tolerant rapeseed.
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