Large-scale genome-wide association study reveals that drought-induced lodging in grain sorghum is associated with plant
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ORIGINAL ARTICLE
Large‑scale genome‑wide association study reveals that drought‑induced lodging in grain sorghum is associated with plant height and traits linked to carbon remobilisation Xuemin Wang1 · Emma Mace1,2 · Yongfu Tao1 · Alan Cruickshank2 · Colleen Hunt1,2 · Graeme Hammer3 · David Jordan1 Received: 2 March 2020 / Accepted: 3 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message We detected 213 lodging QTLs and demonstrated that drought-induced stem lodging in grain sorghum is substantially associated with stay-green and plant height suggesting a critical role of carbon remobilisation. Abstract Sorghum is generally grown in water limited conditions and often lodges under post-anthesis drought, which reduces yield and quality. Due to its complexity, our understanding on the genetic control of lodging is very limited. We dissected the genetic architecture of lodging in grain sorghum through genome-wide association study (GWAS) on 2308 unique hybrids grown in 17 Australian sorghum trials over 3 years. The GWAS detected 213 QTLs, the majority of which showed a significant association with leaf senescence and plant height (72% and 71%, respectively). Only 16 lodging QTLs were not associated with either leaf senescence or plant height. The high incidence of multi-trait association for the lodging QTLs indicates that lodging in grain sorghum is mainly associated with plant height and traits linked to carbohydrate remobilisation. This result supported the selection for stay-green (delayed leaf senescence) to reduce lodging susceptibility, rather than selection for short stature and lodging resistance per se, which likely reduces yield. Additionally, our data suggested a protective effect of stay-green on weakening the association between lodging susceptibility and plant height. Our study also showed that lodging resistance might be improved by selection for stem composition but was unlikely to be improved by selection for classical resistance to stalk rots.
Introduction
Communicated by Hai-Chun Jing. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00122-020-03665-2) contains supplementary material, which is available to authorised users. * David Jordan [email protected] 1
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Warwick, QLD 4370, Australia
2
Agri-Science Queensland, Department of Agriculture and Fisheries (DAF), Warwick, QLD 4370, Australia
3
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD 4072, Australia
Water availability is a primary constraint to crop production worldwide. Amongst many cereal crops, sorghum is renowned for its tolerance to drought and heat (Hadebe et al. 2017). However, sorghum is often exposed to various types of water stress with drought during grain filling being common (Chapman et al. 2000; Kholová et al. 2013). One of the impacts of water stress during grain filling i
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