Differences and correlation of grain filling performance and quality in different parts of adlay based on Richards equation
[Objective]The differences in grain filling and fruiting performance,quality traits and their correlation in different parts of adlay were explored,which provided reference for optimizing the yield performance of strong and weak adlay and breeding high-quality and high-yield cultivation varieties.[Method]Using the single factor random block design and Richards equation,the study investigated the differences in correlation indicators such as grain dry weight,filling rate,grain plumpness and starch content in different parts(upper,middle,lower 1,lower 2,and lower 3)of different adlay varieties[Guiyi No.1(GY.1)and Shizongheike(SZHK)],as well as the correlation between filling and fruiting characteristics and filling parameters and quality traits.[Result]The grain filling equation was W=78.76/(1+379259e0.27t)1/7 91,the maximum grain filling rate was 1.82 mg/d,with an average of 1.12 mg/d.The active growth period was 73.61 days,with an average seed setting rate of 74.55％and an average filling degree of 76.84％.The 100-grain weight and the total grain weight per stem were 7.70 and 13.49 g,respectively.The dry weight of grains gradually increased with the number of days after flowering,reaching its maximum value on the 49th day.The filling rate showed a trend of first increasing and then decreasing with the number of days after flowering,reaching its maximum value on the 31 st day after flowering.As for the average grain filling rate,Lower 1(1.26 mg/d)was significantly higher than other parts,and 21.10％higher than the Lower 3(1.04 mg/d);The maximum grouting rate was also shown to be the highest in Lower 1(2.03 mg/d),which was 18.70％higher than Lower 3(1.71 mg/d);The overall performance of 100-grain weight and fullness in each part was as follows:Lower 1＞upper＞middle＞Lower 2＞Lower 3.Among the 100 grains weight,Lower 1(8.37g)was significantly higher than other parts,with 12.95％and 14.81％higher than Lower 2(7.41 g)and Lower 3(7.29 g),respectively.In terms of grain plumpness,Lower 1(80.23％)was 10.78％higher than Lower 3(72.42％);The starch content of the first seed of adlay(38.10％)was 12.62％and 15.07％higher than that of Lower 2(33.83％)and Lower 3(33.11％),respectively.The correlation analysis showed that the 100-grain weight was highly significantly positively correlated with the average grain filling rate(0.78),maximum grain filling rate(0.89),starch content(0.95).The starch accumulation rate(0.88)was highly significantly positively correlated with the plumpness of grains(0.87),and highly significantly negatively correlated with soluble sugar content(-0.93).[Conclusion]The Lower 1 grain is superior to other parts in terms of grain weight,plumpness and starch content.It is preliminarily determined that the Lower 1 is a strong grain of adlay,while the Lower 2 and Lower 3 are weak grains.
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