Why do plants sprout in spring and bear fruit in autumn?

After long-term research, scientists believe that the main factors leading to the growth of plants in spring are the influence of long-term sunshine and low temperature. In late autumn, the sun sets. Due to the shortening of sunshine time, plants produce high concentration of abscisic acid, which can inhibit the growth of plants, thus forming dormant buds, and plants enter a dormant state. Spring has come, and the sunshine time has become longer. The leaf primordium in dormant buds is stimulated, which reduces the concentration of abscisic acid in plants, increases the content of growth regulators, and some enzymes necessary to break dormancy and germination begin to synthesize, thus promoting the synthesis of protein.

Another factor is that low temperature in spring will increase the hydration degree of dormant buds of plants, and hydrolase and oxidoreductase will become active, which will promote the transformation and respiration of organic matter and make animals start to sprout and grow. The conditions needed for plants to break the dormancy state are the same as the natural conditions in spring, which is an adaptability formed in the long-term evolution of plants.

Some scientists believe that when plants choose to germinate and grow depends mainly on the amount of DNA (deoxyribonucleic acid) in plant cells. High DNA content makes plants germinate early, and vice versa.

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Simply put, the environment in spring is suitable for germination.