Brassinosteroids as metahormones: Evidence for their specific influence during the critical period in Sorghum development

被引:14
作者
Amzallag, GN [1 ]
机构
[1] Judea Ctr Res & Dev, IL-90404 Carmel, Israel
关键词
brassinosteroid; critical period; networks of regulation; sensitivity to hormones; developmental regulation of growth;
D O I
10.1055/s-2002-37397
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In Sorghum bicolor, the effect of brassinosteroid (BR) treatments on blade elongation depends both on concentration and on the stage of development. A specific period of increase in sensitivity to BR is reported during early vegetative development. It coincides with emergence of a critical period during which the between-organs relationship is readjusted as a function of new developmental events or new environmental conditions. Accordingly, the influence of BR cannot be completely understood without separating its effects during stable phases (phenophases) and during critical periods. A high level of redundancy exists in networks of regulation, so that modifications due to BR treatments generally remain cryptic. Nevertheless, it is shown that BR affects the pattern of relationships between organs, confirming its involvement in emergence of a new network of regulation. It is suggested that, during critical periods, brassinosteroids act as "metahormones" integrating the new emerging regulation network by triggering changes in cellular sensitivity to PGRs.
引用
收藏
页码:656 / 663
页数:8
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