WANG Peng
1College of Forestry,Henan University of Science and Technology,Luoyang 471000 ; 2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009FAN Xiu-cai
2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009ZHANG Ying
2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009LI Min
2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009LIU Chong-huai
2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009JIANG Jian-fu
2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009LI Xiu-zhen
1College of Forestry,Henan University of Science and Technology,Luoyang 471000 ;1College of Forestry,Henan University of Science and Technology,Luoyang 471000;2Zhengzhou Fruit Research Institute,Chinese Academy of Agricultural Sciences,Zhengzhou 450009
National Natural Science Foundation(31601718); National Modern Agricultural Industry Technology System Construction Special Project(CARS-29-yc-1); Special Project of Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences(CAAS-ASTIP-2018-ZFRI)
Grape (Vitis L.) is one of the most important economical fruit trees in China. However, a shattering rachis-like phenotype in some varieties is un-desirable, particularly during long-distance transport and storage. Breeding for storage-resistant varieties is one of the most effective measures to prevent this problem. In this study, six hundreds of accessions from Zhengzhou National Grape Germplasm Repository were evaluated for the pulling force of fruit stalk with a digital tension machine. Whether pulling force of fruit stalk correlated to fruit handle, fruit pedicle and fruit brush lengths were analyzed as well. The results showed that the pulling force of six grape varieties showed a decreasing trend during fruit ripening. The pulling force of fruit stalk of hard flesh is stronger than that of soft flesh varieties. The pulling force of 600 grape accessions ranged from 0.72 to 9.16N, showing a continuous distribution consistent with positive skewness distribution. The pulling force was distributed into weak (P≤3N), medium (3N<P≤6N) and strong (P>6N) 3 classes, with respective proportion of 73.7%, 23.8% and 2.5%. It showed that most grape accessions tested in the germplasm resources have weak pulling forces. Several grape varieties showed strong pulling force of fruit stalk, including Red Globe, MuDanhong, Mathias Aromatic and so on. The pulling force of fruit stalk in different varieties was positively correlated with the single grain weight, fruit stalk and fruit brush lengths, unit cross-section area of fruit stalk, fruit pedicle and fruit brush lengthes. Moreover, the pulling force negatively correlated with the ratio of unit cross-section area of fruit brush versus berry weight. Taken together, this research provided valuable information on characterizing the pulling force of grape germplasm resources in future breeding for new grape varieties.