不同生态区主要育成谷子品种芽期耐旱性鉴定

以-0.5 MPa的PEG6000作渗透介质模拟干旱条件,对不同生态区的谷子(Setaria italica(L.)Beauv.)品种(系)进行种子萌发耐旱鉴定。结果表明:在PEG6000胁迫下,萌发耐旱指数与相对根芽比、芽生长抑制率呈极显著负相关;与根生长抑制率呈正相关,但相关系数小,相关不显著;与相对发芽势呈极显著正相关,且相关系数达0.939,可以反映谷子芽期耐旱性。根据萌发耐旱指数,将201份谷子品种(系)划分为极抗旱、抗旱、中度抗旱、不抗旱和极不抗旱5个等级。

Identification of drought tolerance at germination period of foxtail millet cultivars developed from different ecological regions

Drought tolerance of 201 varieties of foxtail millet (Setaria italica (L.) Beauv.) from different ecological regions was investigated during germination with simulate water stress by -0.5MPa PEG6000. The results showed that the correlation was negative between germination drought resistance index (GDRI) and the relative ratio of root to sprout, and negative between GDRI and the inhibition ratio of sprout growth, and lower positive between GDRI and the inhibition ratio of root growth. The significantly positive correlation was found between GDRI and relative germination energy (RGE), and the correlation coefficient was 0.939. RGE could reflect the drought resistance at germination period of foxtail millet. Two hundred and one foxtail millet varieties were classified five groups as extremely drought tolerance, drought, moderate drought tolerance, no drought and extremely drought resistance based on GDRI.