Responses of soybeans to water stress during germination, 3: respiration of soybean seeds during imbibition.
1981
Kim Y.W. | Minor H.C.
Respiration of whole seeds and seed parts isolated from four soybean varieties Essex, Pickett, Wayne and Bonus was measured at 25 degrees Centigrade during germination. The average respiration rates of cotyledons were significantly higher than those of other parts. The values were 35.7, 28.0 and 23.0 ul/hr/seed for cotyledons, embryos, and hila, respectively. Bonus showed a significantly lower respiration rate than the other varieties did. The interaction of variety x seed part was not a significant source of variation for respiration. This suggests that seed part and variety independently contribute to soybean seed respiration during early imbibition. The effects of imbibition time and time x variety interaction on whole seed respiration were significant, but the variety effect was not significant. The correlation coefficient between seed moisture content and respiration after 24 hours of imbibition was significant for Bonus, but not for the other varieties tested. This suggests that Bonus may require more water for respiration during imbibition than the other varieties. There was no significant correlation of whole seed respiration rate after 24 hours imbibition with seed weight or seedling length.
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