Abstract
Aluminum tolerance is known as the key factor that limits growth of crop plants in acid soils. However, other stress factors, such as proton rhizotoxicity also affect on the yield of crops. In acid soils, these factors would be co-existed and acted as selection presser. To determine intra-species difference of aluminum tolerance and other stress factors associated with acid soil, we compared root-growth of over 200 Arabidopsis thalianaaccessions using hydroponic culture conditions. In the presence of ten-times diluted MGRL nutrients, each ten seed of 200 accessions were grown for one week with aluminum or low pH conditions. CV value for aluminum was larger than that of low pH indicated that genetic factors controlling aluminum tolerance would have relatively larger variation. No significant relationship existed between aluminum tolerance and low pH tolerance, indicating that major genetic factors controlling tolerance for each stress might be different in this plant species.
