Registration of ‘Addi Jo’ rice

Abstract

‘Addi Jo’ (Reg. no. CV-162; PI 701526), a high-yielding and high-amylose long-grain rice (Oryza sativa L.) cultivar, was developed by the Louisiana State University Agricultural Center at the H. Rouse Caffey Rice Research Station near Crowley, LA, and was approved for release in 2021. Addi Jo was derived from the cross ‘Thad’/‘Catahoula’. It demonstrated good yield potential and favorable agronomic characteristics in the 2018 preliminary yield trial. From 2019 to 2022, Addi Jo underwent evaluation in 32 replicated trials across nine locations in Louisiana. Four high-yielding commercial cultivars were included as checks: ‘Mermentau’, ‘Cheniere’, ‘Jupiter’, and ‘CL153’. The grain yield of ‘Addi Jo’ was 8.8 t ha⁻¹ compared to 8.9 t ha⁻¹ for Mermentau, 8.3 t ha⁻¹ for Cheniere, 9.2 t ha⁻¹ for Jupiter, and 9.5 t ha⁻¹ for CL153 across 24 trials from 2019 to 2022. Addi Jo had a similar plant height to Mermentau, Cheniere, and CL153, and was 4-cm taller than Jupiter. It exhibits cooking quality similar to Thad, with high amylose and gel temperature. Addi Jo is moderately susceptible to sheath blight and bacterial panicle blight, moderately resistant to narrow brown leaf spot (Cercospora spp.), and resistant to leaf blast.