干旱胁迫下玉米自交系叶片木质素含量变化及其与耐旱性的关系

选用耐旱性不同的6个玉米自交系,在不同干旱胁迫强度及正常灌水条件下,测定叶片的木质素含量,并转换为耐旱系数,研究其与雌雄花期间隔和单株子粒产量耐旱系数的相关性。结果表明,耐旱性不同的自交系叶片的木质素含量对干旱胁迫的反应不同。在干旱胁迫条件下,耐旱性较强的自交系木质素含量显著升高,平均耐旱系数较大,耐旱性中等的自交系木质素含量比正常灌水对照略有升高,耐旱性较弱的自交系木质素含量与对照相当或下降。在中等干旱和严重干旱条件下,叶片木质素含量平均耐旱系数与单株子粒产量和雌雄花期间隔耐旱系数的相关系数分别为r=0.848和r=0.889,均达显著水平。

Changes of Lignin Content in Leaf of Maize Inbred Lines Under Drought Stress and Its Relationship with Drought Tolerance

Leaf lignin content was assayed with 6 inbred lines of different drought tolerance under strong and moderate drought stress as well as well-watered control, and converted into drought tolerant coefficient. Correlation analysis was made between drought tolerant coefficients of leaf lignin content and per plant grain yield as well as anthesis-silking interval. Significant difference was found in the response of leaf lignin content of inbred lines with different drought tolerance to drought stress. Under drought stress, the leaf lignin content of highly tolerant inbred lines increased significantly with a high average drought coefficient, the leaf lignin content of intermediate tolerant inbred lines increased slightly, while the leaf lignin content of drought sensitive inbred lines matched with the well-watered control or decreased slightly. Under the strong and moderate drought stress, significant correlation coefficients (r= 0.848 and r=0.889) were estimated between the average drought tolerant coefficient of leaf lignin content and the drought tolerant coefficients of per plant grain yield and anthesis-silking interval.