Registration of ‘YZ05-51’ Sugarcane

Abstract

YZ05-51' (Reg. No. CV-161, PI 673444) sugarcane (a complex hybrid of Saccharum spp.) was developed through cooperative research conducted by the Yunnan Sugarcane Research Institute (YSRI) of Yunnan Academy of Agricultural Sciences, and Yunnan Yunzhe Technology Development Co. Ltd. It was released to growers in mainland China on 1 Aug. 2013. YZ05-51 was selected from the cross Yacheng 90-56 × 'ROC 23' planned by YSRI and crossed at Yacheng Sugarcane Breeding Station (YSBS) of the Guangzhou Sugar Industry Research Institute, Yacheng, Hainan Province of mainland China in January 2005. The female parent (Yacheng 90-56) is an advanced clone developed by YSBS. The male parent (ROC23) is a cultivar developed by the Taiwan Sugar Research Institute. YZ05-51 was selected from a ive-stage selection program in YSRI and tested in the eighth China Regional Trial for Sugarcane Varieties at 14 locations in mainland China for 2 yr. YZ05-51 was released by the China Committee of Sugarcane Variety Release because of its higher cane yield compared with ROC16 and ROC22 (two reference cultivars) (7. 1 and 1.1%, respectively), its higher sugar yield compared with ROC16 and ROC22 (10.6 and 2.7%, respectively), and its resistance to drought, high resistance to smut (caused by Ustilago scitaminea H. & P. Sydow), and moderate resistance to mosaic (Sorghum mosaic virus and Sugarcane mosaic virus).

Registration of ‘YZ081609’ Sugarcane

“…The stool that became YZ081609 was selected from Stage 1 and advanced to Stage 2 in February 2009 with 2153 unreplicated selections. The seedling was selected from the plant‐cane crop, with emphasis on visible judgment for plant height, millable stalks per stool, stalk diameter, self‐trashing, pith and amount of hairs (group 57) on leaf sheath, and occurrence of smut and mosaic (Zhao et al, 2015). For Stage 2, the row length was 4.5 m, and the row spacing was 1.0 m. The number of rows for each clone depended on the number of stalks of the selected stool in Stage 1.…”

“…In addition, it showed positive traits such as thick stalks, good self‐trashing, little hair on leaf sheath, and clean leaves, with only a rare smut stool found in ratooned plants. In Stage 5, cane and sugar yields were calculated using the following equations as described by Zhao et al (2015): …”

“…The percentage of infection was calculated from final number of whips and the final number of tillers. The rating scale for smut consisted of nine classes: highly resistant (0.00–6.00%), resistant 1 (6.01–11.00%), resistant 2 (11.01–16.00%), moderately resistant (16.01–20.00%), moderately susceptible (20.01–30.00%), susceptible 1 (30.01–40.00%), susceptible 2 (40.01–60.00%), highly susceptible 1 (60.01–80.00%) and highly susceptible 2 (80.01–100%)(Zhao et al, 2015, 2017). Screening of YZ081609 and the reference cultivars ROC22 and ROC16 for disease reactions to mosaic was conducted at a field condition in Mile County, where mosaic, including Sorghum mosaic virus and Sugarcane mosaic virus, is a major disease.…”

“…cultivar developed through cooperative research conducted by Yunnan Sugarcane Research Institute (YSRI) of Yunnan Academy of Agricultural Sciences, and Yunnan Yunzhe Technology Development Co., Ltd. The “Y” in YZ081609 is the first capital character of the province name of Yunnan , and “Z” is the first capital character of Zhe , which is a Chinese word that means sugarcane (Zhao et al, 2015; 2017). The number 08 indicates that YZ081609 was selected from the seedlings stage in the year 2008, and 1609 means that YZ081609 was the 1609th selection assigned in Stage 2 in the year 2009.…”

“…The number 08 indicates that YZ081609 was selected from the seedlings stage in the year 2008, and 1609 means that YZ081609 was the 1609th selection assigned in Stage 2 in the year 2009. YZ081609 was selected from a five‐stage selection program (Zhao et al, 2015;2017) in YSRI (103°34′ E, 24°34′ N) located at Kaiyuan, Yunnan Province, and was tested in the 14th Yunnan Regional Trial of Sugarcane Varieties (YRTSV, 2015–2017) at six locations. The YRTSV was organized by the Yunnan Seeds Regulation Station.…”