1. Changes of plants in winter

Abnormal depression: after entering winter, the temperature began to decrease, the growth of plants almost stopped, and most plants entered the dormancy period. As people have summed up from experience, winter is the season when everything sleeps. In winter, the temperature becomes very low. Coupled with the cold wind, the leaves of plants turn yellow and fall off, leaving only bare branches. Compared with other seasons, it will appear to be very lack of vitality and vitality and extremely depressed. Because most plants have poor cold resistance, they may even freeze to death if they are outdoors, but this is a normal phenomenon

Improvement of cold resistance: after entering the winter, the plant enters the deep sleep period, respiration decreases, the consumption of nutrition decreases, and the metabolic intensity of the whole plant decreases a lot, helps to accumulate nutrients such as sugar, can enhance stress resistance. In addition, the concentration of plant cell fluid will also increase, which can reduce the freezing point and play a role of self-protection. In the cold resistance exercise year after year, the content of amino acids in plants increases gradually, and the content of proline also increases significantly, which can play the role of antifreeze and play a certain role in the adaptation of plants to adversity

2. Changes of plants in autumn

Autumn is the season of falling leaves. After autumn, the leaves of some perennial plants will turn yellow and then gradually wither and fall. Annual plants may enter the end of life and slowly wither and die. Most plants fall leaves in autumn, because after autumn, the temperature decreases, the light weakens, and there is less rain. The water and nutrients that can be absorbed by the roots of plants are greatly reduced, which is not conducive to their normal photosynthesis and transpiration. In this case, if the leaves are kept, the water of the plant will be consumed faster, which is not conducive to survival. Therefore, the most obvious change of plants after autumn is the withering and falling of leaves