Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Plant Physiology
Tesfamichael H Kebrom, J. E. Mullet

Abstract

Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorghum genotypes is similar until 6 d after planting when buds of phyB-1 arrest growth, while wild-type buds continue growing and develop into tillers. Transcriptome analysis at this early stage of bud development identified numerous genes that were up to 50-fold differentially expressed in wild-type/phyB-1 buds. Up-regulation of terminal flower1, GA2oxidase, and TPPI could protect axillary meristems in phyB-1 from precocious floral induction and decrease bud sensitivity to sugar signals. After bud growth arrest in phyB-1, expression of dormancy-associated genes such as DRM1, GT1, AF1, and CKX1 increased and ENOD93, ACCoxidase, ARR3/6/9, CGA1, and SHY2 decreased. Continued bud outgrowth in wild-type was correlated with increased expression of genes encoding a SWEET transporter and cell wall invertases. The SWEET transporter may facilitate Su...Continue Reading

Citations

Dec 24, 2016·Plant, Cell & Environment·Markkandan GanesanPill-Soon Song
Nov 22, 2017·The Plant Journal : for Cell and Molecular Biology·Ryan F McCormickJohn E Mullet
Feb 12, 2019·The Plant Journal : for Cell and Molecular Biology·Le LuoJunko Kyozuka
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Jul 17, 2019·Cold Spring Harbor Perspectives in Biology·Yang Zhu, Doris Wagner
Sep 5, 2017·The Plant Journal : for Cell and Molecular Biology·Franziska FichtnerJohn E Lunn
Nov 23, 2017·Frontiers in Plant Science·Tesfamichael H Kebrom
Nov 5, 2019·Frontiers in Plant Science·Anne SchneiderJessica Bertheloot
Oct 10, 2020·Plant, Cell & Environment·Chrysoula K PantazopoulouRonald Pierik
Oct 18, 2020·The New Phytologist·Franziska FichtnerJohn E Lunn
Mar 4, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Huaiqing HaoHai-Chun Jing
Mar 12, 2021·Journal of Experimental Botany·Carlos Esteban HernandoJorge José Casal
Mar 27, 2016·Current Opinion in Plant Biology·Leonela G CarriedoSiobhan M Brady
Jul 1, 2020·Trends in Plant Science·Wei GuoLam-Son Phan Tran

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