假苍耳的生活史进程中几种生理生化指标的变化

本文试图从生理生化的角度对假苍耳(Iva xanthifolia)生活史进程中可溶性糖类、赤霉素、单宁以及黄酮的变化进行探讨。通过对假苍耳在生长发育期间几种生理生化指标的测定, 结果表明, 在假苍耳生活史进程的不同阶段, 其体内各种代谢产物的含量基本都在种子或芽阶段具有最高含量。此外, 不同发育阶段可溶性还原糖含量的变化规律相似: 芽>花序>苗>成株>种子。除在花序和苗阶段没有测到海藻糖, 其他各阶段海藻糖的含量变化如下: 芽>成株>种子。另外, 只有在种子阶段检测到棉子糖, 其含量为15.43 mg.g-1。赤霉素含量的变化规律如下: 种子＞芽≈苗≈花序＞成株。单宁含量的变化趋势: 种子＞成株＞苗＞芽＞花序。黄酮含量的变化趋势: 种子＞芽＞成株≈花序＞苗。值得注意的是, 当单宁/黄酮的比值接近1时, 植物体内需要的单宁和黄酮的含量则相对较低; 相反, 当单宁/黄酮的比值接近0时, 植物体内需要的单宁和黄酮的含量则较高。

Changes in Several Physiological-biochemical Parameters During the Life Cycle of Iva xanthifolia

In this paper, we discuss the dynamics of soluble sugars, gibberellins, tannins and flavonoids during the life cycle of Iva xanthifolia, to enrich our understanding of this asteraceae weed that is widespread in northeast China. Most studied metabolites peaked in seeds or sprouts, although their contents differed. In addition, different soluble sugars had similar tendencies at different stages: sprout> inflorescence> seedling> adult> seed. Except for in inflorescences and seedlings, trehalose had a movement of sprout> adult> seed. We determined raffinose in the seed at 15.4329 mg. g-1. Giberellins had an obvious change in pattern, as seed> sprout≈seedling≈inflorescence> adult. Tannins and flavonoids each had a trend of seed> adult> seedling> sprout> inflorescence and seed>sprout> adult≈inflorescence> seedling, respectively. Remarkably, when the ratio of tannins to flavonoids neared 1, the plant had a low concentration of tannins and flavonoids; in contrast, when the value neared 0, the plant had a high level of tannins and flavonoids.