Abstract:

In this study, the aluminum tolerance of 66 Cynodon dactylon germplasm materials with different geographical distribution was preliminarily evaluated by five indexes, namely, relative withering rate, relative turf quality, relative shoot mass weight, relative root mass weight and relative total mass weight. The results showed that there were significant (P<0.05) or extremely significant (P<0.01) differences in the growth of C. dactylon germplasm under the treatment of 2500 μmol/L aluminum concentration. The variation coefficient of different indicators was ranged from 19.90% to 36.56%, among which the variation coefficient of relative withering rate was the largest (36.56%), while the variation coefficient of relative turf quality was the smallest (19.90%). There was an extremely significant positive correlation between relative shoot mass weight and relative total mass weight (P<0.01), and the correlation coefficient was 0.942. Through the subordinate function method, 66 samples of C. dactylon germplasm were divided into four grades, among which Grade 1 was extremely resistant to aluminum, including five samples, accounting for 7.57% of the total tested materials. Grade 2 was relatively resistant to aluminum, including four materials, accounting for 6.06% of the materials tested. Grade 3 was intermediately resistant to aluminum, including 47 materials, accounting for 71.21% of the materials tested. Grade 4 was sensitive to aluminum, including 10 materials, accounting for 15.15% of the materials tested. Through the comprehensive evaluation of the aluminum tolerance of the 66 materials, five aluminum resistant germplasms were selected, namely B219, B532, A522, A075 and B509.

Key words: Cynodon dactylon, aluminum tolerance, germplasm resources, evaluation