Reduced Strigolactone Synthesis Weakens Drought Resistance in Tall Fescue via Root Development Inhibition

Author:

Zhong Li12ORCID,Yang Chunyan2,Chen Yueyu3,Guo Li2,Liu Dandan2,Deng Jijin1,Xu Yuejun2,Chen Ying2,Zhao Degang1

Affiliation:

1. The Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region, Guizhou University, Guiyang 550025, China

2. Guizhou Institute of Prataculture, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China

3. Guizhou Qian-Da Institute of Eco-Environment & Health, Guiyang 550025, China

Abstract

Drought stress significantly hampers plant growth and productivity. Strigolactones (SLs), a class of carotenoid-derived plant hormones, are recognized for their pivotal role in modulating plant morphology and enhancing drought resistance. Nonetheless, the underlying mechanisms through which SLs influence drought tolerance in tall fescue remain largely unexplored. In this study, we employed TIS108 to inhibit SL biosynthesis under drought conditions and assessed a range of morphological and physiological parameters in tall fescue, including biomass both above and below ground, antioxidase activities, proline and soluble sugar contents, and survival rates, across treatments of drought and drought coupled with TIS108 inhibition. Our findings demonstrate that the suppression of SL synthesis detrimentally affects the drought resilience of tall fescue. Through comprehensive transcriptome sequencing and subsequent qRT-PCR analyses of samples subjected to drought with and without TIS108 treatment, we identified a marked downregulation of genes involved in auxin metabolism and root development. This downregulation correlated with significant reductions in total root length, root surface area, and the number of root tips under drought stress conditions. Collectively, our research elucidates that the inhibition of SL synthesis impairs drought tolerance in tall fescue by constraining root growth and development, mediated through the modulation of auxin metabolism.

Funder

the National Natural Science Foundation of China

Innovation Project

Science and Technology Program of Guizhou

Program of Guizhou Academy of Agricultural Sciences

Science and Technology Foundation of Guizhou Province

Publisher

MDPI AG

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