Study on Difference in Aluminum Resistance of Barley, Wheat and Rye

通过水培条件下大麦、小麦和黑麦幼苗根系的发育和根尖及部分幼苗铝含量的测定，探讨了大麦、小麦和黑麦耐铝性差异的可能机制，发现不同的根系发育模式和对铝处理的不同反应存在着较大的特异性差异。黑麦在铝胁迫下以次生根的旺盛生长代替了初生根的迅速衰退，并保持了次生根伸长和膨大的旺盛生长。铝胁迫下，大麦根系停止伸长和分枝，根尖出现打结现象，根尖、近端、近中、近端铝浓度的比较表明，黑麦新根的铝浓度显著低于大麦和小麦，尤其是根尖，而老根与大麦和小麦之间差异不显著。

Possible mechanism on difference in aluminum resistance of barley, wheat and rye was investigated through root development and aluminum concentration in root tips and some other small portion of the seedling plants under solution culture.Major particular differences were found in different pattern of root development and different response to aluminum treatment. Rye was particular in vigorous development of secondary root in place of rapid decline of primary root and vigorousness of elongation and blunching of the secondary root was maintained under aluminum stress. On the contrary, the root of barley plant stopped elongation and branching under aluminum stress and the tips of root appeared knotting.Comparison of aluminum concentration in the root tips, sub-apical, middle, and proximal declared that newly developed root of rye showed significantly lower levels particularly in the tip than those of barley and wheat, and that old roots gave no significant differences among them.