文献类型：期刊文献

英文题名：Phenotypic Differences and Physiological Responses of Salt Resistance of Walnut with Four Rootstock Types

作者：Ji, Xinying[1] Tang, Jiali[1] Fan, Wei[2] Li, Baoxin[1] Bai, Yongchao[1] He, Junxing[1] Pei, Dong[1] Zhang, Junpei[1]

第一作者：Ji, Xinying

通信作者：Zhang, JP[1]

机构：[1]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat, State Forestry & Grassland Adm,Res Inst Forestry, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2022

卷号：11

期号：12

外文期刊名：PLANTS-BASEL

收录：;Scopus(收录号：2-s2.0-85135311379);WOS:【SCI-EXPANDED(收录号:WOS:000817464400001)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant Number: 2019YFD1001603).

语种：英文

外文关键词：walnut rootstock; salt stress; growth characteristics; physiology and biochemistry; principal component analysis

摘要：Walnut is one of the world's four largest nuts. Currently, the bottleneck in walnut breeding is the production of resistant variants. Soil salinization is a global problem, and the use of salt-tolerant rootstocks is a basic strategy to overcome the challenge of sustained walnut production. Providing a scientific basis for the selection of walnut salt-tolerant rootstocks is possible by studying the physiological and biochemical response characteristics and salt tolerance variations of different walnut genotypes under salt stress. In the present study, seedlings of four genotypes of walnut rootstocks, including J(1) (Juglans hindsii), J(2) (J. mandshurica), J(3) (J. regia x J. mandshurica), and J(4) (J. regia x J. hindsii), were employed as test materials to conduct a 28-day pot experiment under NaCl stress with five NaCl concentrations (0, 50, 100, 200, and 300 mmol/L). Under different NaCl treatment concentrations, seedling morphology, growth indices, chlorophyll content, photosynthetic parameters, relative electrical conductivity (REC), malondialdehyde (MDA), proline (Pro), soluble sugar (SS), and the activity of superoxide dismutase (SOD) and peroxidase (POD) in the leaves were examined. Salt stress altered the morphological characteristics and growth indices of seedlings from four genotypes to varying degrees. In addition, according to the analysis of physiological and biochemical data, salt stress had a considerable impact on both the physiological and biochemical processes of seedlings. Salt stress decreased the chlorophyll content and photosynthetic parameters of four genotypes, the REC, MDA content, Pro content, and SS content of each genotype increased by different degrees, and the enzymatic activities showed different trends. The salt tolerance of rootstocks was evaluated thoroughly using principal component analysis and membership function analysis based on the 16 parameters. The results of a comprehensive evaluation of salt tolerance showed that the order of salt tolerance of the four genotypes was J(4) > J(1) > J(3) > J(2), which corresponded to the order of the morphological symptoms of salt injury. In conclusion, J(4) has strong salt tolerance and is an important germplasm resource for walnut salt-tolerant rootstock breeding.