一棵三年生五宝珠系的重瓣白色杜鹃花,开了两年白色绿芯的重瓣花,定名为绿牡丹。可是在近两年的四月间却开出几十朵娇艳的粉红花,花冠9～11厘米,比往年大1～2厘米;花瓣4～7层,16～23片,比往年增加1～3倍;花形由原来的开放形变成紧凑的牡丹形。观者都很奇怪,为什么白花变成红色呢?这是我做的改变花色试验,现介绍如下。 1.花变原因。研究证明,花的各种颜色主要由花青素决定。花青素是花的细胞液中的一种物质,在酸性溶液中呈红色。在碱性 A perennial five-pearl-based double-white rhododendron, opened two years of white green core of double flower, named green peony. But in the last two years in April but dozens of beautiful pink flowers out of the corolla 9 to 11 cm, 1 to 2 cm larger than in previous years; petals 4 to 7, 16 to 23, an increase of 1 ~ 3 times; flower shape from the original open into a compact peony shape. The viewers are very strange, why white into red? This is what I do to change the color test, are presented below. 1. Flowers change the reason. Studies have shown that the various colors of flowers are mainly determined by anthocyanins. Anthocyanins are a substance in flower cell liquid that is red in acidic solution. In alkaline