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Auxin and Its Interaction With Ethylene Control Adventitious Root Formation and Development in Apple Rootstock
Tuanhui Bai1, Zhidan Dong1, Xianbo Zheng1
1College of Horticulture, Henan Agricultural University, Zhengzhou, China.
Frontiers in Plant Science
|November 12, 2020
Summary
Indole-3-butyric acid (IBA) promotes adventitious root (AR) formation in apple by upregulating key genes. However, prolonged IBA treatment inhibits root elongation, a process mediated by ethylene signaling.
Area of Science:
- Plant Biology
- Horticulture
- Molecular Biology
Background:
- Adventitious root (AR) formation is crucial for plant propagation.
- Indole-3-butyric acid (IBA) is a key auxin precursor in AR development.
- The interplay between auxin and ethylene in apple AR formation remains unclear.
Purpose of the Study:
- To investigate the effects of IBA on AR development in apple.
- To elucidate the interaction between auxin (IBA) and ethylene in apple AR formation.
Main Methods:
- Application of IBA and ethylene treatments to apple explants.
- Gene expression analysis using RNA sequencing (RNA-seq).
- Analysis of root primordia formation and root elongation.
Main Results:
- IBA application stimulated root primordia formation and increased AR numbers.
- Upregulation of AR formation genes (MdWOX11, MdLBD16, MdLBD29) by IBA.
- IBA stimulated ethylene production, and auxin's inhibition of AR elongation was ethylene-dependent.
Conclusions:
- IBA is essential for initiating AR formation in apple.
- Ethylene plays a critical role in mediating auxin's inhibitory effect on AR elongation in apple.
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