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以芦笋品种NJ978为试材,研究了NaCl胁迫对芦笋幼苗生长及体内Na+,K+,Ca2+吸收和分布的影响,结果表明:盐分对芦笋幼苗生长的抑制作用随NaCl浓度的增加而加剧,低盐胁迫下(NaCl≤50mmol/L),芦笋生长与对照没有显著差异,高盐胁迫(200~300mmol/L NaCl)显著抑制了幼苗生长.随NaCl浓度的增加,芦笋体内Na+含量增加,K+,Ca2+含量降低.芦笋根系对Na+有一定的截留能力,低盐环境下(NaCl≤100mmol/L),根部Na+迅速增加,而地上部Na+增加缓慢,从而抑制了Na+向地上部运输,并维持了地上部相对稳定的K+,Ca2+平衡;外界NaCl浓度高于根系Na+截留阈值后(100mmol/L),大量的Na+运输至地上部并限制了K+,Ca2+的吸收,表现为K+/Na+和Ca2+/Na+迅速下降.芦笋根系对K+,Ca2+,Na+选择吸收性(ASK,Na,ASCa,Na)随盐胁迫增加而变高;根部向地上部运输K+,Ca2+能力(TSK,Na,TSCa,Na)在0~100mmol/L NaCl水平下逐渐升高,之后迅速下降.以上结果表明:根部对Na+的截留和Na+,K+,Ca2+在器官水平上的再分布是芦笋适应盐胁迫的重要机制之一.
Asparagus variety NJ978 was used as experimental material to study the effects of NaCl stress on the growth and the absorption and distribution of Na +, K +, Ca2 + in asparagus seedlings. The results showed that the inhibitory effect of salt on the growth of asparagus seedling was aggravated with the increase of NaCl concentration, Asparagus did not show any significant difference in the growth of the asparagus compared with the control (NaCl≤50mmol / L), while high salt stress (200 ~ 300mmol / L NaCl) significantly inhibited the growth of the seedlings.With the increase of NaCl concentration, the content of Na + The content of Na + in the roots of Asparagus officinalis L. had a certain interception ability. Under the condition of low salt (NaCl≤100mmol / L), Na + increased rapidly and the Na + increased slowly, which restrained Na + K + and Ca2 + were relatively stable. The external NaCl concentration was higher than that of the root Na + cut-off (100mmol / L), and a large amount of Na + was transported to aboveground and restricted the absorption of K + and Ca2 + (ASK, Na, ASCa, Na) of Asparagus officinalis root increased with increasing salt stress, while K +, Ca2 + transport ability (TSK, Na, TSCa, Na) 0 ~ 100mmol / L NaCl levels gradually increased, then decreased rapidly.The above results show that: the root Na + retention and Na +, K +, Ca2 + redistribution on the organ level is an important mechanism asparagus adapt to salt stress.