Breeding report of a new variety of Zizyphus jujuba ‘Jindongzao’

Abstract: Jujube (Zizyphus jujuba Mill.) is a unique economic forest species in China.‘Dongzao’jujube (Ziziphus jujuba‘Dongzao’) is the main table cultivars for its wonderful quality.‘Jindongzao’has excel⁃lent comprehensive properties which is a mutation variety of‘Dongzao’from Shanxi Yuncheng and foundby Institute of Horticulture Shanxi Academy of Agricultural Sciences and Wanrong County HuangFu Sh⁃uangling professional cooperative. It was initially selected in 2006 for its hypertrophic leaves and early rip⁃ening time. After regional adaptability testing at four sites (including Salt lake valley, Wanrong County,Linyi county, Yongji county in Shanxi provence) over six years from 2009 to 2015 and investigating accord⁃ing to stipulation in“Descriptors and Data Standard for Jujube”; it was finally examined and approved inJanuary 2016 by the Shanxi Provincial Forest Variety Examination and Approval Committee. This speciesis a medium-sized tree; The tree is medium with ramose crown and open tree gesture. Young branches aredark red with grey in color, then dull grey-brown. Leaf is ovate-lanceolate, 5.90 cm long, 4.25 cm wide,blunt serrated and more wider in shape, more green in colour, more thick and solid compared to‘Dong⁃zao’. Flower is pistac, 6.8 cm across, with honey plate 3.5 cm across. Fruit is mainly oblate, has ocher redpeel and light ware surface. Its flesh is white, crisp, rich juice, fine texture and aroma. The average fruitweight is 22.1 g, maximum fruit weight is 43.9 g; date stone is 0.85 g. Juice yield is 66.2%, the content ofsoluble solid is 30.9%, edible rate is 96.5%, the content of protein is 1.68%, the content of soluble acid is0.38%, vitamin C is 3.65 mg·g-1 et al. The fruit development period is 105 d and it matures at the late Sep⁃tember in Wanrong area; the number of inflorescence is 12.5. Fruit uniformity is good. It is suitable to culti⁃vate in areas annual average temperature over 11 degrees, and this variety can bear fruits the same year,has high yield potential, has potential advantages of marketing and show a good prospect for commercialproduction because of its distinguishing feature of early fruiting, bumper harvest, easy management, excel⁃lent quality. Orchard should choose neutral sandy loam soil which is flat and has ability of moisture and fer⁃tilizer retention; spacing in the rows and spacing between rows are 1.5 m×4 m, the pollinizer is not neces⁃sary; pruning includes pinching, branch drawing and band girdle, aiming at controlling tree vigor.