Botany School, University of Cambridge, Downing Street, CB2 3EA, Cambridge, UK.
Planta. 1983 Apr;157(3):271-3. doi: 10.1007/BF00405193.
When 16-d-old plants of Pisum sativum, grown in a 12-h photoperiod, were transferred to continuous illumination, the starch content of the leaves rose steadily for 20 h but then declined appreciably. Plants of the same age, grown in an 18-h photoperiod, were, after 9 h light, exposed to (14)CO2 in the light for 15 min, and then transferred to (12)CO2 in the light or dark for up to 4.25 h. In (12)CO2 in the dark there was a marked decline in the amount and labelling of starch in the leaves. In the light in (12)CO2 the amount of starch in the leaves increased steadily but no change in its radioactivity could be detected. Thus, although pea leaves can degrade starch in the light, extensive degradation does not necessarily accompany starch synthesis.
当豌豆植株在 12 小时光照周期下生长至 16 天时，被转移到连续光照下，叶片中的淀粉含量在 20 小时内稳步上升，但随后显著下降。同样年龄的植物，在 18 小时光照周期下生长，在 9 小时光照后，用 14CO2 在光下照射 15 分钟，然后转移到光或暗下的 12CO2 中，最长可达 4.25 小时。在黑暗中的 12CO2 中，叶片中淀粉的含量和标记明显下降。在 12CO2 光下，叶片中的淀粉含量稳步增加，但放射性没有变化。因此，尽管豌豆叶片可以在光照下降解淀粉，但淀粉的广泛降解并不一定伴随着淀粉的合成。
