Study on the effects of plant growth regulators on the regulation of plant flowering
Time:2023-01-31 Follow:412
When the plant reaches a certain stage of growth and development, it will turn into reproductive growth under appropriate environmental conditions, that is, it will form flower buds at a certain position, and then blossom and bear fruit. The number of flower bud differentiation directly affects the later results and yield. Most fruit trees have the phenomenon of big and small years, which is caused by the number of flower bud differentiation. In order to reasonably control flower bud differentiation, people have done a lot of research:
Pineapple is a fruit with very different maturity in the south, and the maturity period is only 20 days. The application of ethephon to promote flowering can make single crop fruit into multiple crop fruit. The planned use of ethephon at different times to promote its flower bud differentiation can extend the 25-30 day fruit harvest period of pineapple in South China to about 200 days, which is greatly beneficial to the production and market supply of pineapple.
Some plant growth regulators, such as paclobutrazol, chlormequat, ethephon and cytokinin or their mixture, are widely used for apple size, which can completely control the high yield of the year and the high yield of the year, that is, reach the desired level.
Other fruit trees, such as pears and grapes, can also use CCC and 6-BA to regulate their vegetative growth and promote flower bud formation.
At the same time, the use of plant growth substances can also inhibit flower bud differentiation. Apple and pear can inhibit its excessive flower bud formation with about 300mg/L of gibberellin 2 to 6 weeks before flower bud differentiation in the year with many fruits; Gibberellin can also inhibit the flower bud differentiation of apricot, peach and cherry; Grape can also control its flower bud differentiation.
In addition, the use of plant growth substances can also reduce the formation of ineffective flowers, delay the opening of flowers, and extend the flowering period. The formation of peanut ineffective flowers can be greatly reduced by regulating phosphorus; Applying gibberellin to grapes and some fruit trees with stone fruits in autumn can delay their flowering date in the next spring, which has certain production significance for preventing early frost in spring.
Both paclobutrazol and CCC have the effect of prolonging the flowering time of chrysanthemum, especially paclobutrazol, which can prolong its flowering time by more than 10 days.