ScGAI is a key regulator of culm development in sugarcane

Journal of Experimental Botany
Rafael Garcia TavaresMarcelo Menossi

Abstract

Sugarcane contributes more than 70% of sugar production and is the second largest feedstock for ethanol production globally. Since sugar accumulates in sugarcane culms, culm biomass and sucrose content are the most commercially important traits. Despite extensive breeding, progress in both cane yield and sugar content remains very slow in most countries. We hypothesize that manipulating the genetic elements controlling culm growth will alter source-sink regulation and help break down the yield barriers. In this study, we investigate the role of sugarcane ScGAI, an ortholog of SLR1/D8/RHT1/GAI, on culm development and source-sink regulation through a combination of molecular techniques and transgenic strategies. We show that ScGAI is a key molecular regulator of culm growth and development. Changing ScGAI activity created substantial culm growth and carbon allocation changes for structural molecules and storage. ScGAI regulates spatio-temporal growth of sugarcane culm and leaf by interacting with ScPIF3/PIF4 and ethylene signaling elements ScEIN3/ScEIL1, and its action appears to be regulated by SUMOylation in leaf but not in the culm. Collectively, the remarkable culm growth variation observed suggests that ScGAI could be used ...Continue Reading

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Citations

Feb 16, 2019·DNA Research : an International Journal for Rapid Publication of Reports on Genes and Genomes·Leandro Costa NascimentoMarcelo F Carazzolle
Nov 15, 2019·Journal of Experimental Botany·Hilde Nelissen, Nathalie Gonzalez
Feb 12, 2021·Plant Science : an International Journal of Experimental Plant Biology·Jinlan FangMuqing Zhang
Mar 9, 2021·Frontiers in Plant Science·Maria Juliana Calderan-RodriguesCamila Caldana
Oct 1, 2021·Frontiers in Plant Science·Chunhui LiYong Li
Oct 26, 2021·Frontiers in Microbiology·Qi LiuZiting Wang

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