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Air Temperature During Seed Filling and Soybean Seed Germination and Vigor

^a Dep. of Plant and Soil Sciences, Univ. of Kentucky, Lexington, KY 40546-0312
^b Texas Agr. Exp. Stn., Dallas, TX 75252
^c Dep. of Plant Pathology, Univ. of Arkansas, Fayetteville, AR 72701

View larger version (20K): [in a new window]   Fig. 1. Relationship between standard germination or accelerated-aging germination and mean daily maximum temperature during soybean seed filling (growth stage R5–R7) for DP4690. Growth stage R8 was used for the end of seed filling in Kentucky and Mississippi in 2001. All seed lots were included (n = 19) and regression analysis with several models resulted in no significant relationship between seed quality and temperature.

View larger version (24K): [in a new window]   Fig. 2. Relationship between standard germination or accelerated-aging germination and mean daily maximum temperature during soybean seed filling (growth stage R5–R7) for Hutcheson. Growth stage R8 was used for the end of seed filling in Kentucky and Mississippi in 2001. All seed lots were included (n = 20), and the regression analysis for standard germination was not significant (P = 0.05), but the model for accelerated-aging germination (Y = –98.966 + 17.682X – 0.401X2) was significant (P = 0.01).

View larger version (22K): [in a new window]   Fig. 3. Relationship between standard germination or accelerated-aging germination and mean daily maximum temperature during soybean seed filling (growth stage R5–R7) for DP4690. Only those seed lots showing no evidence of seed infection by Phomopsis longicolla in the standard germination test were included (n = 11). The regression models were not significant (P = 0.05). Data from irrigated experiments are identified with an asterisk.

View larger version (24K): [in a new window]   Fig. 4. Relationship between standard germination or accelerated-aging germination and mean daily maximum temperature during soybean seed filling (growth stage R5–R7) for Hutcheson. Only those seed lots that showed no evidence of seed infection by Phomopsis longicolla in the standard germination test were included (n = 12) and regression models for standard germination (Y = 135.551 – 1.409X, P = 0.05) and accelerated-aging germination (Y = –724.794 + 60.952X – 1.126X2, P = 0.01) were significant. Data from irrigated experiments are identified with an asterisk.

View larger version (21K): [in a new window]   Fig. 5. Relationship between accelerated-aging germination and abnormal seedlings in the accelerated-aging germination test for those seed lots with no evidence of seed infection by Phomopsis longicolla. The dashed line represents normal + abnormal seedlings = 100% (i.e., no dead seeds).

View larger version (24K): [in a new window]   Fig. 6. Relationship between accelerated-aging germination and mean daily maximum temperature during the last 14 d of seed filling (growth stage R7 – 14d) for those seed lots with no evidence of seed infection by Phomopsis longicolla in the standard germination test. The regression analysis for DP4690 (Y = 144.440 – 2.162X, P = 0.05) was not significant, but the model for Hutcheson (Y = –185.875 + 23.937X – 0.508X2) was significant at P = 0.01.