Briefly describe the types and characteristics of flower bud differentiation.

Briefly describe the types and characteristics of flower bud differentiation as follows:

Summer-autumn differentiation type: only once a year, in the high temperature season from June to September, until the end of autumn, the main part of the flower organ blooms in early spring or the following spring. But the formation of its sex cells must go through low temperature. Such as peony, clove, elm leaf plum, plum blossom and so on. Winter-spring differentiation type: flower bud differentiation lasts for a short time after stopping growth in autumn and before germination in the following spring.

Differentiation type once a year: some species that bloom in summer and autumn in that year form flower buds at the top of new branches or flower stems, such as crape myrtle, hibiscus, hibiscus, day lily, chrysanthemum, etc. Multiple differentiation in one year: branches sprout many times in one year, and each branch top can form flower buds and bloom, such as jasmine, rose, upside-down golden bell, carnation and so on. ?

Flower bud differentiation refers to the process of separating leaves and axillary buds from the growing point of plant stems and differentiating into inflorescences or flowers. Different tree species have different flower bud differentiation processes and morphological indexes. Flower bud differentiation can generally be divided into physiological differentiation and morphological differentiation. Physiological differentiation is a process in which a growing point in a bud is transformed into a flower bud in a physiological state, and its completion state is the beginning of a flower, and then it will bloom, which is also a process of morphological differentiation.

The three stages of flower bud differentiation include physiological differentiation, morphological differentiation and sexual cell formation. Among them, the morphological differentiation stages are divided into: the initial stage of physiological differentiation, the stage of sepal primordium formation, the stage of petal primordium formation, the stage of stamen primordium formation and the stage of pistil primordium formation.