Involvement of Auxin and Brassinosteroid in Dwarfism of Autotetraploid Apple (Malus × domestica).

ABSTRACT: The plant height is an important trait in fruit tree. However, the molecular mechanism on dwarfism is still poorly understood. We found that colchicine-induced autotetraploid apple plants (Malus × domestica) exhibited a dwarf phenotype. The vertical length of cortical parenchyma cells was shorter in autotetraploids than in diploids, by observing paraffin sections. Hormone levels of indoleacetic acid (IAA) and brassinosteroid (BR) were significantly decreased in 3- and 5-year-old autotetraploid plants. Digital gene expression (DGE) analysis showed that the differentially expressed genes were mainly involved in IAA and BR pathways. microRNA390 was significantly upregulated according to microarray analysis. Exogenous application of IAA and BR promoted stem elongation of both apple plants grow

SUBMITTER: Ma Y 

PROVIDER: S-EPMC4877651 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature