Assessment on Salt-tolerance of Zoysia spp. in China
LI Ya, GENG Lei, LIU Jian-xiu(Institute of Botany, Chinese Academy of Sciences of Jiangsu Province,Nanjing,Jingsu Province 210014,China)
By morphological classification and geographical distribution, 36 Zoysia germplasm samples were selected from a wide collection of Zoysia germplasms from China. Planted in pots of sand, their salt-tolerance was tested with nutrient solutions containing 0,0.2%,0.5%,1%,2% and 4% salt concentration. The result shows that except for some accessions of Zoysia japonica ,the rest tolerate solutions of (0.5%) NaCl concentration, and the majority of them resist injury of 1% solution of salt concentration, while most of them suffer NaCl injury with 2% or grimmer salt concentration. Thus indicating that Zoysia boasts strong salt resistance capacity. Most accessions have lower NaCl-tolerance than CK(C-106).Moreover,their salinity tolerance capacities are varient due firstly to their different strains, and secondly to the soil texture of their habitats. Those floruishing in the seashore or coastal regions tend to be stoutly salt-resistant. Their salt-tolerance capacity has a negative relationship to their leaf length and width, and the hairiness of the leaf blades, though no such relations prevail with Zoysia japonica and Z.sinica . The 36 accessions of Zoysia spp.could be divided into four grades by salt-tolerant coefficient: high NaCl tolerant,medium NaCl tolerant,tolerant, and sensitive to NaCl.