马铃薯丰产植株光合产物日变规律的研究(一)——干物率及其日变化

马铃薯丰产砰体植株的叶片、茎秆、块茎的干物率在整个生育期间,始终低于一般群体,其日变化规律两群体相同,均表现昼高夜低的变化趋势,但茎秆和块茎不明显。全生育期,茎秆干物半始终低于叶片和块茎,叶片干物半生育前期高于块茎,生育后期低于块茎。叶片干物率的高低与植株长势呈正相关关系。因此,叶片干物率的高低是衡量植株生长状况和内部代谢强弱的重要生理生化指标。

STUDIES ON THE LAWS OF DRY MATTER RATE AND ITS DIURNAL VARIATION IN POTATO HIGH-YIELD POPULATION PLANTS

In comparison with common yield population, the dry matter rate of leaves, stems and tubers in high-yield population plants during the whole growing period are is constantly lower. Their diurnal variation tends to be great in the daytime and low at night. The dry matter rate of stems is constantly lower than that of leaves and tubers, and the dry matter rate of leaves is higher at early stage than that of tubers, but is lower at late stage. There is a positive correlation between the dry matter rate of leaves and plant vigour. Thus, the size of the dry matter rate of leaves is an important physiological biochemical index for evaluating the state of plant growth and the activity of internal metabolism.