Betaine improves plant stress resistance and promotes growth and development. Betaine has multiple functions in resisting adverse stresses, including osmotic regulation, scavenging reactive oxygen species, maintaining biofilm stability, protecting photosynthetic machinery, and maintaining the structure and function of macromolecular protein complexes and enzymes.
A. What role does betaine play in plants during the drought season?
Betaine is a cytoplasmic osmotic substance and a class of quaternary ammonium compounds. Its chemical name is N-methylamino acid, with the general formula R₄·N·X. Plants accumulate betaine under drought and salinity conditions, primarily in the cytoplasm. In normal plants, betaine content is approximately 10 times higher than proline. During water deficit, betaine accumulation is slower than proline, and when water stress is relieved, betaine degradation is also slower than proline.
B. What role does betaine play in melon vegetables during their fruit-swelling period?
Betaine is a natural chemical substance commonly found in plants. It is harmless to the human body and does not affect the normal color change and expansion of fruits. Its basic mechanism of action is that during the fruit-swelling period of melons and vegetables, when exposed to floods, droughts, or temperature fluctuations, betaine glycine is added to regulate the osmotic pressure inside and outside the fruit and pulp cells, stabilizing the cell membrane structure. This allows the fruit and pulp cells to expand synchronously and evenly, thereby effectively preventing fruit cracking and minimizing fruit losses.
C. How does betaine help maintain flowering and fruit preservation when melons and fruits are exposed to floods, droughts, and temperature fluctuations?
Betaine is a cellular osmotic pressure regulator, primarily concentrated in the cytoplasm. It maintains the osmotic pressure inside and outside the fruit, stabilizes the structure of biomolecules and cell membranes, and supports normal cellular function. Betaine is a natural substance commonly found in plants. It is non-toxic to humans and does not affect the normal color change and expansion of fruits. Its mechanism of action is as follows: During the melon swelling period, when encountering floods, droughts, or temperature fluctuations, supplementation with betaine regulates the osmotic pressure balance inside and outside the fruit and flesh cells, stabilizes the cell membrane structure, and allows the fruit and flesh cells to expand synchronously and evenly, effectively preventing cracking and minimizing fruit losses.
D. How does betaine regulate plants under salinity or water stress?
Betaine’s function: Maintaining cellular osmotic pressure: When exposed to salinity or water stress, large amounts of organic osmotic regulators, such as betaine, accumulate in the cytoplasm. These inorganic osmotic regulators in the cytoplasm are primarily driven into the vacuole, maintaining osmotic balance between the cytoplasm and the surrounding environment. The accumulation of betaine in plants under salt stress is an important physiological phenomenon that benefits plant growth under stress, and its content is positively correlated with the plant’s salt tolerance. Protective effects on alcohol: Betaine is highly soluble and carries no net charge. High concentrations of betaine have no effect on many enzymes and other biomolecules, and may even have a protective effect.
