Registration of a blast resistant premium medium grain rice germplasm Eclipse

Authors: Jia, Yulin; Jia, Melissa

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/2/2022
Publication Date: 1/6/2023
Citation: Jia, Y., Jia, M.H. 2023. Registration of a blast resistant premium medium grain rice germplasm Eclipse. Journal of Plant Registrations. https://doi.org/10.1002/plr2.20253.
DOI: https://doi.org/10.1002/plr2.20253

Interpretive Summary: Rice blast disease is one of the most damaging rice diseases worldwide. In the present study, we developed a blast resistant and ‘Calrose’ type medium grain quality rice germplasm, Eclipse. It was selected from a backcross between a tropical blast resistant japonica rice variety Katy and a temperate medium grain rice variety ‘M-202’. Eclipse was evaluated in uniform regional rice nurseries in Southern USA during 2019-2020 and further characterized in Arkansas fields during 2020-2021. Blast resistance was determined under greenhouse and field conditions. Under greenhouse conditions, Eclipse was resistant to the blast race, IA45, IB1, IB49, IB54, IC17, IE1, IG1, IH1 similar to that of Katy. Under naturally infected field conditions in Louisiana and Puerto Rico, Eclipse was resistant to both leaf and panicle blast infections similar to that of Katy. Eclipse has Pi-ta and Ptr genes, lacks Pi-b, Pi-k and Pi-z. Eclipse is a glabrous type of medium grain rice and has a low amylose content identical to M202 and a quality of Calrose rice. In Southern United States, Eclipse has an average height of 98 cm and yields 8686 kilograms of grains per hectare. It reaches 50% heading at 83 days after planting with a lodging rate of 22% and 59% head rice. Eclipse is useful for dissecting components involved in disease resistance, breeding for improving disease resistance, grain quality and can also be used directly by rice growers for premium grain production under organic conditions and for intercropping with other valuable livestock, such as fish.

Technical Abstract: ‘Eclipse’ is a blast resistant and ‘Calrose’ type medium grain quality rice germplasm that was developed by the USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, Arkansas. It was selected from a backcross between a tropical blast resistant japonica rice variety Katy and a temperate medium grain rice variety ‘M-202’. Eclipse was evaluated in uniform regional rice nurseries in Southern USA during 2019-2020 and further characterized in Arkansas fields during 2020-2021. Blast resistance was determined under greenhouse and field conditions. Under greenhouse conditions, Eclipse was resistant to the blast race, IA45, IB1, IB49, IB54, IC17, IE1, IG1, IH1 similar to that of Katy. Under naturally infected field conditions in Louisiana and Puerto Rico, Eclipse was resistant to both leaf and panicle blast infections like that of Katy. Eclipse has Pi-ta and Ptr genes, lacks Pi-b, Pi-k and Pi-z. Eclipse is a glabrous type of medium grain rice and has a low amylose content identical to M202 and a quality of Calrose rice. In Southern United States, Eclipse has an average height of 98 cm and yields 8686 kilograms of grains per hectare. It reaches 50% heading at 83 days after planting with a lodging rate of 22% and 59% head rice. Eclipse is useful for dissecting components involved in disease resistance, breeding for improving disease resistance, grain quality and can also be used directly by rice growers for premium grain production under organic conditions and for intercropping with other valuable livestock, such as fish.