Gibberellin is a widely available class of plant hormones. Its chemical structure belongs to diterpenoid acids, which are derived from the tetracyclic framework. Stimulates the growth of leaves and buds. There are at least 38 known gibberellins. Gibberellin is used in agricultural production and has good effects in some aspects. For example, to increase the yield of seedless grapes and break the dormancy of potatoes, to use GA3 to promote the germination of barley seeds for maltose preparation when brewing beer, to promote heading with gibberellin treatment when rice is slow due to rainy and low temperatures, or to adjust the flowering period in hybrid rice seed production so that the parents can meet the original flowering period.
Brassinolide promotes cell division and promotes fruit expansion. It has a significant promoting effect on cell division, and has a promoting effect on the lateral growth and longitudinal growth of organs, thus playing the role of expanding the fruit. Delay leaf senescence, keep green for a long time, strengthen chlorophyll synthesis, improve photosynthesis, and promote leaf color to deepen and turn green. Breaking the apical dominance, promoting the germination of side buds, can guide the differentiation of buds, promote the generation of side branches, increase the number of branches, increase the number of flowers, improve pollen conceptivity, thereby increasing the number of fruits and improving the yield. Improve crop quality and improve commerciality. Induce parthenogenesis, stimulate ovary expansion, prevent flower and fruit dropping, promote protein synthesis, and improve sugar content.
Therefore, the above two plant growth regulators do not have a relationship of replacing each other, but a relationship of mutual promotion or complementary functions. From the following aspects:
1. In the flowering stage, adding foliar fertilizer containing a variety of trace elements with brassinolide will improve the flower quality, improve the vitality of male anthers, improve the tolerance of female stigma, and improve the fruit setting rate, so as to ensure the fruit preservation effect of the number of young fruits in the early stage.
2. In addition, when encountering the influence of natural factors that are not conducive to fruit setting, such as drought, waterlogging, diseases and pests, brassinolide is used together with foliar fertilizer to improve the stress resistance of the plant, so as to reduce the harm caused by unfavorable factors to the plant, and achieve the purpose of relative fruit preservation. After the end of secondary physiological fruit drop, due to too many fruits, or temporary shortage of nutrients in the tree body or other factors, the delamination between the fruit stalk and the branch tip may be formed due to the development of abscisic acid in the tree. At this time, spraying gibberellin will show its effect of reducing fruit drop.
Therefore, to sum up, gibberellin and brassinolide should be used appropriately according to specific conditions and situations after understanding their effects, so that the application between the two can be relatively rationalized.