Regulation of plant growth by cytokinin

These results suggest that cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots

T. Werner; V. Motyka; M. Strnad; T. Schmulling

2002

Scholarcy highlights

  • The manipulation of cytokinin oxidase gene expression could partially overcome the lack of cytokinin biosynthetic mutants and might be used as a powerful tool to study the relevance of iP- and Z-type cytokinins during the whole life cycle of higher plants
  • We report the cloning of four putative CKX genes from Arabidopsis thaliana and the results of their systemic overexpression in transgenic tobacco plants
  • The SAM of AtCKX1 transgenic plants was smaller than in wild-type plants and fewer cells occupied the space between the central zone and the peripheral zone of lateral organ formation, but the cells were of the same size and no obvious changes of the differentiation pattern occurred
  • Earlier work has shown that in unorganized growing cells, cytokinins induce the formation of shoot meristems, demonstrating that they have a function beyond maintaining the cell cycle
  • Enhanced root growth led to a 60% increase in root dry weight in transgenic plants grown in hydroponic solution
  • The reduced activity of the SAM could be the cause of the incomplete apical dominance, which was noted in transgenic plants, as the amount of auxin produced for the maintenance of apical dominance might be lowered
  • The expression of AtCKX genes in regions of active growth is consistent with the proposed function in cycling cells

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