Abstract: Grafting is beneficial for enhancing the adaptability of grape trees, improving grape yield and quality. With the continuous expansion of grape cultivation area in China, the demand for resistance rootstocks in the market is increasing. 'Yunzhen 5' is a late season rootstock variety bred by Chuxiong academy of agricultural sciences, insititute of tropical eco-agricltural sciences of Yunnan academy of agricultural sciences and so on. Its parents are derived from the cross of 'Yunpu 2' and 'Kangzhen 3'. The hybrid combinations were selected in 2015, and germination and planting were accelerated in 2016, the seedlings came into flowering and fruiting sucessively from 2018. The clone LV28-3 performed well. In 2019, regional planting began in Yuanmou, Binchuan, Qujing of Yunnan province. In 2023, it was registered as a non major crop variety by the Ministry of Agriculture and Rural Affairs and named 'Yunzhen 5' with a registration number: GPD putao(2023)530007. The variety is an interspecific hybrid, with female flowers, light red brown young leaves and tender shoots, large mature leaves, heart-shaped mature leaves, trifid leaves, very dense creeping hairs on the back of leaves, low-lying U-shaped petioles, and slightly overlapped unfolding types. Internode length, and branch hardness is good. Tendrils are well developed. The clusters are cylindrical, without shoulder, with an average clusters weight of about 60 g and a maximum shoulder weight of about 110 g. The spike shaft is long, with an average clusters length of 11.0 cm and an average clusters width of 8.1 cm, uniform maturation on same bunch, and the fruit stalk is difficult to separate. The fruit powder is thick. The berry is round, blue black, with a longitudinal diameter of 1.15 cm, a transverse diameter of 1.09 cm, a shape index of 1.05, and an average weight of 0.80 g. There are 3-4 seeds per berry. Juice yield is 50.8%, Soluble solid content is 19.1%, titratable acid content is 1.8%, and soluble sugar content is 9.2%. In the dry and hot area of Yuanmou, Yunnan Province, it sprouts in late February, blooms in mid April, turns color in mid June and ripens in early to mid July. The internode is long and the branch hardness is good. Tendrils are well developed. The survival rate of cutting was more than 90%, and the grafting compatibility was well with ‘Shine Muscat’ and ‘Kyoho’. It grows vigorously, is resistant to high temperature, drought, salt and alkali, cold, and has strong disease resistance. It is suitable for planting in Binchuan, Jianshui, Yuanmou and Qilin areas in Yunnan, and has broad development prospects in North China and Northwest China. It is suitable for single stem hedgerow cultivation, base fertilizer was applied in the first year, and nitrogen fertilizer and medium and trace elements were the main fertilizer for drip irrigation and topdressing in the early stage of the next year., short shoot should be pruned in winter and more attention should be paid to pest and disease prevention and control.
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