稀土镧对镉胁迫小麦遗传学防护效应的研究

以有丝分裂指数和染色体畸变率为指标,应用水培法研究了重金属Cd对小麦幼苗的毒害及稀土La的防护效应。结果表明:Cd胁迫降低根尖细胞有丝分裂指数,增加染色体畸形率,且毒害效应与剂量和处理时间正相关。Cd胁迫下小麦根外观上呈现大量褐色斑块并伴有不同程度的扭曲,生长延缓或停滞;细胞分裂过程中表现为高频率出现的微核及染色体滞留。La对小麦幼苗Cd污染具有防护效应,可使小麦细胞有丝分裂指数升高、染色体畸变率下降,且对微核的防护效应尤其显著。

Genetic effects of lanthanum on wheat (Tritium aestivum L.) seedlings under cadmium stress

Mitotic index and frequency of chromosomal aberration of root tip cells of wheat seedlings were used as indexes to study the protective effects of lanthanum(La) on wheat seedlings cultured under water planting with heavy metal(Cd) stress.The results show mitotic index decrease and frequency of chromosomal aberration increase under Cd stress,the higher Cd concentrations,and the longer treatment durations,the stronger repression effects.The poisonous effect of Cd on root tip apparently appearing as brown spots and twisted roots induces growing stagnation and abnormal cell chromosome behaviors,including chromosome lag.La can protect wheat seedlings from Cd stress by increasing mitotic index and decreasing frequency of chromosomal aberration,especially reducing formation of micronuclei in root tip cells.