Abstract: The effects of water stress on dry-matter accumulation and distribution for summer maize Ludan 981 were studied including the different organs from tasseling stage to flowering period using potted method under different water condition, such as roots, stems, leaves, leaf sheath, ears, tassels and so on, and also the contribution ratio of these organs to the total output. The main results were as follows. Leaves, stems and leaf sheath were the very important resources for dry-matter accumulation under different water stress, and leaves were the most important organs for the dry-matter accumulation before the seed filling stage. During the early and late seed filling stage, the proportions of the leaf contribution ratio were 22% and 21%. The stems were also one of the resources of dry-matter accumulation. At the early seed filling stage, the proportion of the T₃ stem contribution ratio was 26%, while that of T₄ is 30% at the late tasseling stage. In the silking stage and the late seed filling stage, the proportions of the stems contribution ratio were 24% and 23%, and the proportions of leaf sheath contribution ratio were 21%, 18% respectivey. During the generative growth phase, summer maize was very sensitive to water stress. It was very beneficial to the rapid accumulation of dry matter, that is, the conditions of water stress can shorten the period of the seed filling stage.

Key words: Summer maize, Water stress, Dry-matter partition

CLC Number: 

• S513.01