狗牙根种质资源耐铝性评价

选取相对枯黄率、相对坪用质量、相对地上部分干重、相对根系干重和相对全株干重5个指标对不同地理来源的66份狗牙根材料的耐铝性进行初步评价,从而筛选出不同耐铝型的种质。结果表明：在2500 μmol/L铝浓度处理下,不同狗牙根种质之间的生长存在显著（P<0.05）或极显著（P<0.01）差异,不同指标间的变异系数范围为19.90%~36.56%,其中相对枯黄率变异系数最大（36.56%）,而相对坪用质量变异系数最小（19.90%）;相对地上部干重与相对全株干重存在极显著正相关（P<0.01）,相关系数为0.942,相对枯黄率与相对坪用质量的相关性达到极显著负相关（P<0.01）,相关系数为-0.431;通过隶属函数法,将66份狗牙根种质分为4级,其中1级为极端耐铝型材料,包含5份材料,占总供试材料的7.57%;2级为较耐铝型材料,包含4份材料,占供试材料的6.06%;3级为中间型材料,包含47份材料,占供试材料的71.21%;4级为铝敏感型材料,包含10份材料,占供试材料的15.15%。通过对66份狗牙根材料耐铝性综合评价,筛选出了5份耐铝的种质,依次是B219、B532、A522、A075和B509。

Evaluation of Aluminum Tolerance of Cynodon dactylon Germplasm Resources

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.