| To explore the relationship between ear axis position,grain maturity and seed vigor of Xinjiang spring wheat variety Xinchun 31,the experiment was conducted with the randomized block design in the field.The seeds were harvested 15 d,20 d,25 d,30 d,35 d after anthesis and separated according the position on the spike (upper,middle and bottom part of a panicle),respectively.The characters,such as grain length,grain width,grain thickness,and thousand kernel weight,were measured.The seed vigor indices,such as germination rate,seedling length,and fresh and dry weight,were measured by seed germination analysis.The results showed that the seeds from the middle part of a panicle,harvested 35 d after anthesis exhibited the highest germination rate and germination energy.With the delay of harvest time,the seeds from the same position of a panicle showed an increase trend in grain length,width,thickness,thousand kernel weight,seedling dry weight and vigor index (P＜ 0.05 ).The vigor index of different spike position ranked as the middle>the bottom>the upper.The stepwise regression analysis showed that seed vigor has the highest correlation with thousand kernel weight and grain width,and these two parameters are suggested as the main indices for seed vigor selection. |
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