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Respiration is an important part of the metabolism of higher plants. Closely related to the life activities of plants. Living cells decompose matter continuously through respiration, which plays an important role in the supply of energy required for various life activities in plants and in the synthesis of essential organic materials. At the same time also can enhance the plant's disease resistance.
Respiration is the pivot of metabolism in plants. Respiration is based on the need for oxygen, which is divided into aerobic and anaerobic respiration types.
Under normal conditions, aerobic respiration is the main form of respiration in higher plants, but in anoxic conditions and in special tissues, plants can carry out anaerobic respiration to maintain metabolism. Respiratory metabolism can be carried out in many ways, and its diversity is a kind of adaptability to the changeable environment which is formed in the long-term evolution of plants.
EMP-TCA cycle is the main way to decompose organic compounds in plants, and PPP and other approaches play an important role in respiratory metabolism. The respiratory substrate is completely oxidized, eventually releasing CO2 and producing water, while converting the energy in the substrate into active activation energy in the form of ATP. Only CO2 and a small amount of ATP were formed in the EMP-TCA cycle. Most of the energy is also stored in NADH and FADH2.
These substances are stored in ATP by electron transfer and oxidative phosphorylation of the respiratory chain, which is the main form of storage respiration releasing energy. The metabolism of plant respiration is affected by many factors. Respiration affects the activity of plant life, so it is closely related to crop cultivation, breeding and seed, fruit and vegetable, tuber storage and cut flower preservation.
Humans can use the relevant knowledge of respiration, adjust respiration rate, make it better for the production service. Plants refer to another biological relationship with animals. The difference between animals and plants is formed in the course of long-term evolution. But in the case of tiny creatures, the distinction between them is sometimes not obvious. As an evolutionary trend of plants, independent material metabolic patterns, such as individual occurrence, cell wall formation, photosynthesis by chlorophyll, and independent nutrition system, which are formed by cell stacking, are the main ones, and the non motion on this basis is the secondary characteristic. It is estimated that the existing plant species about 300,000 species, and more than half of the plant industry, fungi, due to the importance of its lack of chlorophyll, and the important characteristics of the plant into two groups, but also some think the entire biological community can be divided into animals, fungi, plants three groups. In the case of classification systems, seed plants (flowering plants) were previously used as the focus of classification and then transferred to the so-called Shine. At present, the plant community is divided into 10~13 doors, and seed plants are only one of them. But even today, in terms of the location and content of important doors, there may be greater disagreement among scholars than in the animal kingdom. In general, the first half of the 20th century was Engler (H. G A The classification system of Engler is the most popular, and in the latter half it is in the path of Beecher (A.Pascher) 's classification system gradually prevailed.