Effects of Foliar Spraying Selenium on Physiological Characteristics,Yield and Quality of Flax
In order to explore the regulatory effects of exogenous selenium fertilizer on yield,agronomic traits,physiological characteristics and quality of flax,two flax varieties,Tongya 16(TY16)and Jinya 10(JY10),were used as experimental materials,and six different doses of selenium fertilizer,water control(T0),20(T1),30(T2),50(T3),70(T4),90 g/ha NaSeO3(T5)were used to study the effects of selenium fertilizer on yield,yield components,photosynthetic parameters,antioxidant enzyme activities,malondialdehyde contents,selenium contents and quality of flax.The results showed that T3 treatment significantly increased the yield of TY16 and JY10,which were increased by 9.91％and 12.51％compared with T0 treatment,respectively,mainly due to the increase of fruit number per plant and fruit number per fruit.Compared with T0 treatment,the net photosynthetic rate,stomatal conductance,transpiration rate and chlorophyll content of leaves under T1-T5 treatments were significantly increased,indicating that photosynthesis was enhanced.The grain selenium content of TY16 and JY10 reached the highest under T5 treatment,which were 0.461 and 0.505 mg/kg,respectively,which were 18.47 and 21.96 times higher than that of T0 treatment.In terms of quality,the content of linoleic acid in seeds were significantly increased by 5.49％-24.56％after application of selenium fertilizer,and the content of linoleic acid in TY16 and JY10 under T3 treatment were increased by 6.96％and 5.84％,respectively,compared with that under T0 treatment.Therefore,the application of 50 g/ha selenium fertilizer not only improved the yield and agronomic traits of flax,but also enhanced the photosynthesis and chlorophyll content,improved the antioxidant capacity of plants,and significantly improved the nutritional value of flax seeds by increasing the content of selenium and the contents of unsaturated fatty acids linoleic acid and linolenic acid in seeds.
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