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Published online 28 March 2005
Published in Crop Sci 45:948-955 (2005)
© 2005 Crop Science Society of America
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Seed Dormancy Imposed by Covering Tissues Interrelates to Shattering and Seed Morphological Characteristics in Weedy Rice

Xing-You Gua, Shahryar F. Kianianb and Michael E. Foleyc,*

a Plant Sci. Dep., North Dakota State Univ., Fargo, ND 58105, and Agricultural College, Yangzhou Univ., Yangzhou 225009, China
b Plant Sci. Dep., North Dakota State Univ., Fargo, ND 58105
c USDA-ARS, Biosciences Research Lab., Fargo, ND 58105-5674



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  		Fig. 1. Correlation between cumulative percentage germination at the ith (i ≤ 30) and the 30th day of incubation. N represents number of genotypes on which the correlation analysis was based.

 


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  		Fig. 2. Distribution for germination of (A) nonafterripened seeds, (B) 11-d afterripened seeds, and (C) nonafterripened caryopses for genotypes from weedy and cultivated rice. Only the moderately to strongly dormant genotypes were further evaluated for caryopsis germination.

 


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  		Fig. 3. Interrelationship among seed dormancy, seed shattering, awn, black hull color, and red pericarp color characteristics. Dormancy was evaluated by germination of intact seeds at 11 d of afterripening. The number on each line represents the linear correlation coefficient range based on the three BC1F1 populations (Table 2). The fine line, heavy lines, and dotted lines indicate correlations are significant at the P = 0.05, P < 0.01, and nonsignificant at P = 0.05 levels, respectively.

 




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