谷子品种抗旱性的苗期快速鉴定

报道了在苗期快速鉴定谷子品种抗旱性的实验结果.通过比较种子在甘露醇渗透胁迫条件下的相对萌发率和芽生长抑制率、幼苗在适度控水条件下的相对含水量和水势、幼苗严重失水恢复供水后的存活率等几个指标,对5个谷子品种(鲁7060、羊角黄、豫谷5号、Jun 24和Mar 51)的苗期抗旱性进行鉴定.结果表明,Mar 51在所鉴定的品种中具有相对的抗旱优势,可以作为谷子苗期抗旱性研究的代表性材料.谷子种子在甘露醇渗透胁迫条件下的相对萌发率与幼苗在适度控水条件下相对含水量的变化趋势一致,初步认为这两个指标可以作为苗期快速鉴定谷子抗旱性的筛选指标.

Rapid Evaluation on Drought Tolerance of Foxtail Millet at Seedling Stage

Five foxtail millet varieties, including Lu 7060, Yangjiaohuang, Yugu No. 5, Jun 24 and Mar 51, were used for rapid drought tolerance evaluation. According to the germination rate in mannitol solution, relative water content (RWC) and water potential of leaves after mid-drought and seedling survival rate after severe drought, the variety Mar 51 was screened as the most drought-tolerant variety among the five varieties. Compared to other varieties, Mar 51 had a higher germination rate and higher relative water content after mid-drought. As a result, germination rate under osmotic stress and RWC could be considered as good indices of drought tolerance and used for rapid evaluation for drought tolerance of foxtail millet.