各种棉花开花时花冠的颜色几乎都是由白色变成深黄色。例如,陆地棉属棉花品种的花冠在开花时均为乳黄色,大约到下午,当温度上升到30—35℃时,便变为粉红色。次日,花瓣变为紫色,并开始皱缩,逐渐枯萎,乃至脱落.在我们的一个用人造旱风处理棉花的试验中曾发现:花冠在整个生活过程中均不变色,即不变红。1953年我们在自然旱风影响下也发现有这样的现象。 When a variety of cotton flowers corolla color almost all from white to dark yellow. For example, the corolla of the genus Upland cotton is milky yellow when it blooms, and turns pink in the afternoon until it rises to 30-35 ° C. The next day, the petals turned purple, and began to shrink, gradually withered, and even fall off.In one of our experiments with artificial dry wind to deal with cotton has been found: Corolla throughout the life of the process does not change color, that does not turn red. In 1953 we also found this phenomenon under the influence of natural drought.