Registration of ‘CL162’ Long‐Grain Rice

Abstract

‘CL162’ (CV‐135, PI 661110), a Clearfield long‐grain rice (Oryza sativa L.) cultivar was developed by Mississippi State University Delta Research and Extension Center in Stoneville, MS, and jointly approved for release by Mississippi State University and BASF in 2011. The population from which CL162 was derived began as a single cross of CFX‐18 (‘CL161’)/‘Priscilla’ (PVP 9800212) made in 2001. CFX‐18, later named CL161, contains the gene for resistance to imazethapyr and imazamox, which are used in the Clearfield rice production system. CL162 was tested at 14 locations in Mississippi in 2008–2010 and in the Uniform Regional Rice Nursery conducted in 2010 Louisiana, Texas, Missouri, and Mississippi, where it had an average grain yield of 9.9 t ha−1 compared with 10.0, 8.9, and 10.7 t ha−1for the comparison cultivars ‘Cocodrie’, ‘CL131’, and ‘CL151’, respectively. Its consistency in grain yield across production sites and years can be attributed, in part, to its excellent straw strength, as shown by a lodging incidence of 3% over the same number of test locations and years, compared with 17% for CL151 and 4% for CL131. CL162 averaged 84 d to 50% heading and 120 d to maturity over all tests from 2008 to 2010 compared with Cocodrie, which averaged 85 d to 50% heading and 119 d to maturity. CL162 is rated as susceptible to sheath blight (caused by Rhizoctonia solani J.G. Kühn); moderately susceptible to bacterial panicle blight (caused by Burkholderia glumae), rotten neck blast (caused by Pyricularia grisea Sacc.), and straighthead disorder; and moderately resistant to leaf blast (caused by Pyricularia grisea Sacc.).

Nitrification and Yield for Delayed‐Flood Rice as Affected by a Nitrification Inhibitor and Coated Urea

“…Soil samples were collected each year before planting (Table 2). The rice variety CL162 (Solomon et al, 2012) was drill‐seeded using a Great Plains drill (Great Plains Mfg., Inc., 1525 E. North Street, Salina, KS) at a rate of 90 kg ha −1 and grown in a delayed‐flood culture. Seeding occurred on 19 April, 20 March and 9 April in 2011, 2012, and 2013, respectively.…”

Introduction of imidazolinone herbicide and Clearfield® rice between weedy rice—control efficiency and environmental concerns

“…Due to the lack of crop rotation and the practice of a monoculture system (Azmi et al 2012), Italy officially marketed the herbicide imazamox and the cultivar CL161 in 2006, which was cultivated on about 52,000 ha from an area of about 235,000 ha (equivalent to more than one-fifth of the total rice area) (Scarabel et al 2012). The USA used cultivars CL152 and CL162, along with imazethapyr herbicide, which was developed for use in USA paddy fields and other crops due to its efficacy against WR (red rice) (Solomon et al 2012). In addition, this technology has been used in approximately one million ha in the USA D r a f t and Brazil (Gealy et al 2003).…”