【摘要】 在土壤含水量稍高于萎蔫系数的干旱条件下 ,以出苗率和生物学产量耐旱系数的乘积为指标 ,测定了 17个玉米自交系和 10个杂交种的苗期耐旱性 ,并与相同条件下的胚芽鞘长度、出苗率、根重、生物学产量、脯氨酸含量、电导率和叶片保水力的耐旱系数进行多元线性回归分析。结果表明 ,胚芽鞘长度、脯氨酸含量和叶片保水力的耐旱系数与苗期耐旱性的回归关系不显著。不能作为玉米耐旱性鉴定的指标 ;根重和电导率的耐旱系数与苗期耐旱性的回归关系 ,在自交系和杂交种中的显著性不同 ,有待进一步研究 ;出苗率和生物学产量的耐旱系数及其乘积 ,是玉米苗期耐旱性鉴定的可靠指标 ,可以以此作多元回归分析估计苗期耐旱性更多还原

【Abstract】 Drought tolerance in seedling stage of 17 inbreds and 10 hybrids of maize was detected under the dry condition that water content of soil was a little higher than wilt coefficient using the product of drought tolerance cofficient of emergence rate and biological yield as the drought tolerance index and its multiple linear regression analysis dependent on the drought tolerance coefficients of coleoptile length,emergence ratio,root weight,biological yield,proline content,electric conductance and leaf water conservation was conducted.The regression of drought tolerance in seedling stage dependent on the drought tolerance coefficients of coleoptile length,proline content and leaf water conservation was non significant and the later three coefficients could not perform as the indexes of drought tolerance identification in maize.The regression of drought tolerance in seedling stage dependent on the drought tolerance coefficients of root weight and electric conductance had different significance between inbreds and hybrids and further studies should be carried out.更多还原