Abnormal depression: After entering winter, the temperature begins to drop, the growth of the plant stops almost, major plant entered dormancy period.As people have concluded from experience, winter is the season when everything sleeps. In winter, the temperature becomes very low, and the cold wind blows, the leaves of plants turn yellow and fall off, leaving only bare branches.Compared with other seasons, it will appear very lack of vitality and vitality, abnormal depression.Because most plants have poor cold resistance, they may even freeze to death if they are outdoors, but this is a relatively normal phenomenon.
Improvement of cold resistance: < span > In winter, when the plant enters the deep sleep period, the respiration is weakened, the consumption of nutrients is reduced, and the metabolic intensity of the whole plant is greatly weakened, which is conducive to the accumulation of nutrients such as sugar. < span > Can enhance stress resistance.In addition, the concentration of plant cell sap will also increase, which can reduce the freezing point and play a role in self-protection.In the year after year of cold hardening, plant amino acid content gradually increased, proline content also increased significantly, can play a role in anti-freezing, for the plant itself to adapt to adversity has a certain role.
Autumn is the season of defoliation. After entering autumn, the leaves of some perennial plants will turn yellow and then gradually wither and fall. The annual plants may step into the end of life and slowly wither and die.Most plants will shed leaves in autumn, because after entering autumn, the temperature decreases, the light weakens, the rainwater is less, and the water and nutrients that the roots of plants can absorb are greatly reduced, which is not conducive to their normal photosynthesis and transpiration.In this case, if the leaves continue to be retained, the water consumption of the plant will be faster, which is not conducive to survival.Therefore, the most obvious change of plants after autumn is the withering and falling of leaves.
