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本文研究了向日葵叶生长动态及功能叶。最初8叶对生,其余轮生。现蕾前叶从茎底部向顶端依次已全部长出,现蕾后到开花阶段则全部展开、扩大,开花期最大叶面积可达1.4m以上。植株呈两头小中间大株型。开花前底部叶片开始黄落,灌浆阶段仅余69％的叶片。生长过程上部邻近的展开叶给新生叶及花盘提供光合产物。主要功能叶层,在花序及开花阶段为植株中部偏上的第19—30叶、灌浆阶段为靠近花盘的第31—39叶,这些叶片的光合强度较大,平均3g/m~2/小时,距花盘越远的叶片功能越小。
In this paper, we studied the growth and function of sunflower leaves. The first 8 leaves opposite students, the rest of the rotation. The bud leaves before the stem from the bottom to the top of all have been grown, after the bud to the flowering stage are all expanded to expand, the maximum flowering leaf area up to 1.4m above. Plants are two small middle large plant type. The bottom leaves began to bloom before flowering, with only 69% of the leaves in the filling stage. The unfolding leaves adjacent to the upper part of the growth process provide photosynthetic products to the new leaf and the faceplate. The main functional leaf layer was the 19th to 30th leaves on the middle part of the plant in the inflorescence and flowering stages and the 31-39 leaves near the faceplate in the filling stage. The photosynthetic intensity of these leaves was large, with an average of 3g / m ~ 2 / h , The farther away from the disk function of the smaller leaves.