Levels of IAA, ABA and carbohydrates in source and sink leaves of Betula pendula Roth.

摘要: Young birch (Betula pendula Roth) seedlings were grown in hydroponic cultures to which nutrients added amounts that increased exponentially over time. The nutrient additions adjusted give three different suboptimal, but stable, relative growth rates (RGR). Levels of glucose, fructose, sucrose and starch the hormones 3‐Indolyl acetic acid (IAA) abscisic (ABA) determined immature (sink) mature (source) leaves related measured RGR seedlings. results show ABA IAA decreased sink as plants decreased. This occurred concert with a decrease soluble sugar levels accumulation source leaves. These observations suggest may be involved source‐sink communication seedlings, although such causal relationships remain proven.