Can gibberellic acid (920) be sprayed on rice to promote heading?
Can gibberellic acid (920) be sprayed on rice to promote heading? Please give an introduction. Gibberellic acid, also known as gibberellin, 920, is a broad-spectrum plant growth regulator. It mainly enters the plant body through leaves, young shoots, flowers, seeds or fruits, and then is transported to actively growing parts to take effect. This agent can promote cell elongation,...
Can gibberellic acid (920) be sprayed on rice to promote heading? Please give an introduction
Gibberellic acid, also known as gibberellin, 920, is a broad-spectrum plant growth regulator. It mainly enters the plant body through leaves, young shoots, flowers, seeds or fruits, and then is transported to actively growing parts to take effect. This agent can promote cell elongation, cause stem elongation and plant height increase, break the dormancy of seeds and tubers, and promote germination, change the ratio of female to male flowers, affect flowering time, and reduce flower and fruit drop.
Gibberellic acid is often used in hybrid rice seed production to adjust the flowering period and promote heading of the maternal parent, preventing the neck-enclosed phenomenon. Studies have shown that spraying gibberellic acid promotes internode elongation in rice. Its mechanism of action is to change the solute concentration between plant cells, thereby causing water to flow into the cells due to osmotic pressure; the cells expand and push against the cell walls, causing them to loosen, which leads to cell enlargement and elongation. The concentration of gibberellic acid sprayed on rice varies depending on the severity of neck enclosure, etc. If the spraying concentration is too high, it will cause the internode below the panicle to become too long and break.
Spraying gibberellic acid at the rice booting and heading stage should be determined according to the plant growth condition. If the rice grows normally, it should not be applied, so as to avoid the last internode of the rice plant elongating too much and causing lodging later; if rice growth is inhibited, heading is difficult, and the neck-enclosed phenomenon appears, it can be sprayed in an appropriate amount. For the above direct-seeded rice field, medium-maturing medium japonica rice was selected for direct seeding from June 15 to 20. By September 1, some fields had begun booting and heading. Rice growth was basically normal, so gibberellic acid should not be sprayed to promote plant heading.
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