第十章 植物的成花生理第章 植物的成花生理第十章 植物的成花生理第十章 植物的成花生理.ppt

地球上不同纬度地区的温度、雨量和昼夜长度等会随季节有规律地变化。 光周期对植物开花的作用 * Both plants shown are FRI plants in the Columbia ecotype of Arabidopsis. The dominant allele of FRI, which is common in some natural ecotypes of Arabidopsis, confers late flowering. Note that the nonvernalized plant (A)has elaborated numerous leaves during its extended vegetative development. The late-flowering phenotype, however, can be reversed by a long cold treatment (B). Both plants are shown at time their first flowers opened. Both plants shown are FRI plants in the Columbia ecotype of Arabidopsis. The dominant allele of FRI, which is common in some natural ecotypes of Arabidopsis, confers late flowering. Note that the nonvernalized plant (A)has elaborated numerous leaves during its extended vegetative development. The late-flowering phenotype, however, can be reversed by a long cold treatment (B). Both plants are shown at time their first flowers opened. Both plants shown are FRI plants in the Columbia ecotype of Arabidopsis. The dominant allele of FRI, which is common in some natural ecotypes of Arabidopsis, confers late flowering. Note that the nonvernalized plant (A)has elaborated numerous leaves during its extended vegetative development. The late-flowering phenotype, however, can be reversed by a long cold treatment (B). Both plants are shown at time their first flowers opened. The relationship between photoperiod and flowering response is different in short-day and long-day plants. The relationship between photoperiod and flowering response is different in short-day and long-day plants. 临界暗期再成花诱导中起决定作用。（3）用闪光处理中断暗期，则是短日植物不能开花，而继续营养生长，相反却诱导了长日植物开花。（4）若在闪光期插入一短暂的暗期，对长日植物和短日植物的开化反应都没有影响。（5）、（6）只要满足一定的暗期植物就能开花。 甘蔗是短日植物。 Figure 19.16 The ABC model for floral organ specification in Arabidopsis.(A) The wild-type Arabidopsis Flower consists of four nested whorls, shown on the left: sepals (green; whorl 1), petals (yellow; whorl 2), stamens (red; whorl 3), and carpels (blue; whorl 4). This general pattern