玉米花期干旱及复水对植株补偿生长及产量的影响

研究了花期干旱对盆栽玉米生长发育、生理特性和产量的影响及复水后植株的补偿生长。花期干旱使雌穗生长发育不良，产量下降，复水后被干旱所延迟的雌穗发育可以部分恢复，存在关明显的补偿生长。复水后产量的补偿表现为百粒重的增加，但这种补偿不足以弥补由于穗粒数的减少而导致的产量下降。随胁迫时间延长及胁迫强度的增加，叶片气孔阻力迅速增加，复水后气孔阻力迅速减少，胁迫强度愈大，恢复速率愈快、蒸腾速率与气孔阻力基本上

Effects of Soil Drought During Flowering and Rewatering on Plant Compensative Growth and Yield of Maize

The corn hybrid Dan Yu 13 were planted in pots containing 0. 016m3 soil extracted from the corn field. The water supply was reduced gradually to cause different degrees of soil drought stress during flowering. The treated plants were rewatered after seven days' stress, while the control was watered normally. Drought caused poor growth and development of the ear, and the retarded growth of the ear could be partially resumed and there was compensative growth in ear volume and ear dry matter after rewatering, the capacity of the compensative growth was related to the degree of the stress. As regards yield, rewatering could make compensation by increase of 100-grain weight, but this was not big enough to compensate the yield loss caused by the great decrease of grain number, and resulted in the great yield loss finally. The stomatal conductivity and transpiration of the leaves decreased quickly under drought, and the more severe the stress, the quicker the recovery after rewatering. The photosynthetic activity of leaf discs decreased obviously under drought, and could be partially resumed only after a short-term rewatering in darkness. It was suggested that the compensative growth of the corn plant after rewatering might be one adaptation to drought stress, and the recovery of the stomatal conductivity and photosynthesis might be the hasis of the compensative growth.