玉米苗期抗旱性鉴定指标的研究

Study on Identification Indexes of the Drought Resistance at Maize Seedling Stage

通过盆栽试验,以14个玉米杂交种(京科308、四单19、辽单565、吉单261、京科25、京单28、京科508、郑单958、京科516、DH3719、丹玉39、中丹808、农大108、京玉6为试验材料,研究了玉米苗期反复干旱对玉米株高、干物质积累、过氧化物酶活性、丙二醛含量、脯氨酸含量等的影响。分析表明,反复干旱胁迫下玉米各杂交种幼苗存活率与株高、干物质积累、POD含量呈正相关,与丙二醛含量、脯氨酸含量呈负相关,上述指标和幼苗反复干旱后存活率的相关性都达到显著水平。鉴定玉米苗期抗旱性以幼苗反复干旱后存活率为主,结合其他5项指标进行综合评价。

Pot experiment was carried out with 14 maize hybrids （Jingke308, Sidanl9, Liaodan565, Jidan261, Jingke25, Jingdan28, Jingke508, Zhengdan958, Jingke516, DH3719, Danyu39, Zhongdan808, Nongda108, Jingyu6） under two levels of water supply（repeated drought stress and CK）during seedling stage. In This paper, after repeated drought seedling survival rate, plant height, dry matter accumulation, peroxidase activity, malondialdehyde content and proline content could all be used as well parameters for repeated-drought-resistantance of seedling stage identification indexes in maize. There were positive correlations between seedling survival rate after repeated drought and plant height, dry matter accumulation, peroxidase activity under repeated drought stress. There were negative correlations between malondialdehyde content and proline content. And total indexes and seedling survival rate after repeated drought were both significant. According to these data, after repeated drought seedling survival rate as the main element on deciding the anti-dry of maize at the seedling stage. At the same time, seedling survival rate after drought and other five coefficients, that proved multi-mechanism in anti-dry of maize, and that provided according on theory for evaluating