TAILIEUCHUNG - báo cáo khoa học: " Timing is everything: early degradation of abscission layer is associated with increased seed shattering in U.S. weedy rice"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Timing is everything: early degradation of abscission layer is associated with increased seed shattering in . weedy rice | Thurber et al. BMC Plant Biology 2011 11 14 http 1471 -2229 11 14 BMC Plant Biology RESEARCH ARTICLE Open Access Timing is everything early degradation of abscission layer is associated with increased seed shattering in . weedy rice Carrie S Thurber Peter K Hepler Ana L Caicedo Abstract Background Seed shattering or shedding is an important fitness trait for wild and weedy grasses. . weedy rice Oryza sativa is a highly shattering weed thought to have evolved from non-shattering cultivated ancestors. All . weedy rice individuals examined to date contain a mutation in the sh4 locus associated with loss of shattering during rice domestication. Weedy individuals also share the shattering trait with wild rice but not the ancestral shattering mutation at sh4 thus how weedy rice reacquired the shattering phenotype is unknown. To establish the morphological basis of the parallel evolution of seed shattering in weedy rice and wild we examined the abscission layer at the flower-pedicel junction in weedy individuals in comparison with wild and cultivated relatives. Results Consistent with previous work shattering wild rice individuals possess clear defined abscission layers at flowering whereas non-shattering cultivated rice individuals do not. Shattering weedy rice from two separately evolved populations in the . SH and BHA show patterns of abscission layer formation and degradation distinct from wild rice. Prior to flowering the abscission layer has formed in all weedy individuals and by flowering it is already degrading. In contrast wild O. rufipogon abscission layers have been shown not to degrade until after flowering has occurred. Conclusions Seed shattering in weedy rice involves the formation and degradation of an abscission layer in the flower-pedicel junction as in wild Oryza but is a developmentally different process from shattering in wild rice. Weedy rice abscission layers appear to break down earlier than wild abscission layers.

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