Current status and prospects of herbicide‐resistant grain sorghum (Sorghum bicolor)

Abstract

Grain sorghum is a versatile crop, which can thrive under limited water and other inputs. However, crop loss from weed infestation continues to be a major constraint in grain sorghum production. Particularly, post‐emergence grass weed control is a great challenge in grain sorghum due to the lack of herbicide options. Unlike in other major crops, such as maize or soybean, herbicide‐resistant sorghum technology that can facilitate weed control throughout crop growing season is not available to growers yet. The development of herbicide‐resistant sorghum can have potential to improve weed management, including post‐emergence grass weed control. One of the major concerns in the development of such technology in sorghum is escape of resistance traits into weedy relatives of sorghum (e.g. shattercane and johnsongrass). This review focuses on sources of herbicide resistance in sorghum, the status of the development of herbicide‐resistant sorghum technologies, overview of breeding methods, and limitations in the development of such sorghum technology as well as economic benefits for sorghum growers. © 2021 Society of Chemical Industry.

Identification and Characterization of Mesotrione-Resistant Grain Sorghum [Sorghum bicolor (L.) Moench]: A Viable Option for Postemergence Grass Weed Control

“…Apart from lack of options for broad-spectrum POST weed control, the evolution of herbicide resistance in weeds warrants the need for investigation of POST herbicide options in sorghum . The development of herbicide-resistant sorghum technology will broaden the POST weed control options. , In addition to control of broad spectrum of weeds, the use of mesotrione as POST herbicide can also help control weeds that are resistant to acetolactate synthase (ALS)- and photosystem (PS)­II-inhibitors and glyphosate. − Though mesotrione is registered for use as a PRE herbicide in sorghum, it can cause severe crop injury when applied as POST. , The availability of mesotrione-resistant grain sorghum will offer more options for weed management which will provide effective weed control during the critical periods of crop growth …”

“…3 The development of herbicide-resistant sorghum technology will broaden the POST weed control options. 11,12 In addition to control of broad spectrum of weeds, the use of mesotrione as POST herbicide can also help control weeds that are resistant to acetolactate synthase (ALS)-and photosystem (PS)II-inhibitors and glyphosate. 13−15 Though mesotrione is registered for use as a PRE herbicide in sorghum, it can cause severe crop injury when applied as POST.…”

“…3,16 The availability of mesotrione-resistant grain sorghum will offer more options for weed management which will provide effective weed control during the critical periods of crop growth. 12 The objectives of this research are to (a) screen sorghum germplasm representing genotypes of the sorghum association panel (SAP) and identify mesotrione-resistant genotypes, (b) determine the level of resistance of selected genotypes under greenhouse and field conditions, and (c) investigate the mechanism and inheritance of mesotrione resistance.…”

Characterization of imazamox-resistant shattercane (Sorghum bicolor L.) populations from Kansas

“…Grain sorghum is the fifth most important cereal crop grown in the world and the third most common cereal crop grown in the United States following corn ( Zea mays L.) and wheat ( Triticum aestivum L.) (Defelice 2006; Pandian et al 2021). The United States ranked first (9.47 × 10 6 kg) in grain sorghum production globally (62.25 × 10 6 kg) in 2020 (USDA-FSA 2021; USDA-NASS 2021).…”

Changes Are in the Air

“…Tataridas et al (6) review the role of early detection and herbicide resistance screening in integrated management of invasive weeds. The strong need and prospects for herbicide‐resistant sorghum are reviewed (7). The prospects for much‐needed herbicides with new modes of action are detailed in a perspective (8).…”