JPH0533201B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a plant growth inhibitor, and in particular, it is an object of the present invention to provide a growth inhibitor that has a special physiological activity that hardly inhibits the growth of plant roots and only inhibits the growth of leaves and stems. Many compounds, including herbicides, have been known as plant growth inhibitors, but most of them inhibit the growth of both the roots and leaves and stems of plants, or inhibit the growth of the roots first. It inhibits growth and causes death. However, depending on the purpose, there is a demand for a plant growth inhibitor that suppresses only the growth of leaves and stems, but does not inhibit the growth of roots. For example, preventing lodging of rice plants, growing healthy seedlings, turf for golf courses and gardens, etc.
Regarding weeds near railway sleepers, it is desirable that the roots grow healthy and firmly, while the leaves and stems do not grow too tall (do not grow very much). Until now, no good so-called growth inhibitors have been known that can meet these purposes, and for this reason, we have developed an economical, non-toxic and safe product that is highly effective when used in relatively small amounts. The development of highly effective growth inhibitors is desired. While researching the extracts of Japanese parsley and parsley, the present inventors discovered a substance that suppresses the growth of leaves and stems without inhibiting the growth of the roots of rice seedlings.After extensive investigation into the surrounding area, they found that allyls in the aromatic ring Group (-CH ₂ CH=
CH ₂ ) or isoallyl group (-CH=CHCH ₃ , methylenedioxy group (-OCH ₂ O-), and methoxy group (-OCH ₃ ) are bonded to aromatic compounds that have the above-mentioned special physiological activity on plants. The present invention was completed by confirming that 1-allyl-2,5-dimethoxy-3,4-methylenedioxybenzene (common name: apiol)
Dimethoxy-3,4-methylenedioxybenzene (isoapiol), 1-allyl-2,3-dimethoxy-4,5-methylenedioxybenzene (zylapiol) or 1-allyl-3-
The present invention provides a plant growth inhibitor containing methoxy-4,5-methylenedioxybenzene (myristicin) as an active ingredient. The above-mentioned compounds related to the present invention have the advantage of being easily procured, exhibiting the above-mentioned special physiological activity significantly in minute amounts, and being a constituent of essential oils of edible plants, and being extremely safe. . The above compounds related to the present invention are specifically shown below. Apiol and its isomers (alkenyldimethoxymethylenedioxybenzenes: Apior Isoapiol Zilapiol myristicin (allylmethoxymethylenedioxybenzenes): Myristicin In the present invention, it is necessary that the compound has an allyl group or an isoallyl group, a methylenedioxy group, and a methoxy group, and a compound lacking any one group does not have the special physiological activity targeted by the present invention. I can't perform to my full potential. For example, 2,3,4,5-tetramethoxyallylbenzene, anethole, and eigenol each have an allyl group, and heliotropin has a methylenedioxy group, but these have both groups in one molecule. Since it is not a natural substance, it does not have such physiological activity and has a greater effect of inhibiting root growth. Cinnamic acid also has no effect. According to the present invention, by applying a trace amount of the above-mentioned compound to plants, it is possible to obtain the effect of suppressing the growth of leaves and stems with almost no inhibition of root growth, thereby preventing lodging of rice and fostering healthy seedlings. In addition to being effective for
Since it suppresses the growth of grass leaves, the number of lawn mowings can be significantly reduced. Furthermore, weeds on the banks that support railroad sleepers are expected to have the effect of reinforcing the banks by spreading their roots, but if the leaves of these weeds grow too long, not only will they have to be cut, but from late summer onwards. Since fire hazards occur in the fall, it is extremely beneficial to keep the roots of these weeds healthy and to suppress only the growth of the leaves and stems. However, such objectives are not achieved using conventional herbicides. To carry out the present invention, the above compound may be dissolved or dispersed in water and sprayed onto target plants at a concentration of usually about 10 to 100 ppm. In addition,
It may be diluted with a solvent or used in combination with an emulsifier, etc.
Further, the compound may be formulated and used so as to be released gradually. Next, the present invention will be explained by examples. Example 1 A tube bottle with an inner diameter of 27 mm and a length of 118 mm is filled with 1.5 g of cellulose powder at the bottom, and an aqueous liquid containing the aromatic compounds shown in Table 1 dissolved or uniformly dispersed in water at a predetermined concentration is added to the bottle. A test bed was prepared by adding 6 ml of . Next, six 1 mm germinated paddy rice (variety: Tanginbozu) seeds prepared in advance under the same conditions were placed in each of these tube bottles, and then irradiated with 3000 lux and kept at 30°C for 12 days. Ta. After this, the effect of the compound on the growth of the seedlings was investigated by measuring the second leaf sheath (LS) and longest root length (R) of each seedling. In addition, 6 ml of water without any compounds was added and grown under the same conditions, and the second leaf sheath (LS) and longest root length (R) of the seedlings were measured.
were determined, and the respective growth inhibition rates [LS inhibition rate, R inhibition rate] and their ratio LS inhibition rate/R inhibition rate were determined. The results were as shown in Table 1. In addition, all the data in Table 1 are based on the average length of 12 individuals,
I found LS and R. In the table, Experiment Nos. 3 to 5 and 7 are of the present invention, and the others are comparative examples.

[Table] Example 2 On the other hand, as a comparative example, the compounds shown in Table 2 were tested in the same manner as in the above example, and the results shown in Table 2 were obtained.

[Table] As can be seen from the above results, in the present invention, a special physiologically active effect was clearly observed in that the growth inhibition of leaf sheaths was greater than that of roots, whereas in this example as a comparative example, allyl group Only (Experiment No.
1, 2, and 3), methylenedioxy group alone (Experiment No. 4), and compounds such as cinnamic acid had a much greater inhibition of root growth. Example 3 10 mg of Apiol was dissolved in 10 ml of ethyl alcohol, and this was diluted with 1 part water to prepare a 10 ppm Apiol aqueous solution. Next, the above Apiol aqueous solution was uniformly sprayed on 1 m ² of a lawn with a plant height (length) of 5 cm and a longest root length of 14 cm in a vinyl greenhouse at 25°C. On the other hand, for comparison, we sprayed water alone on a 1 m ² lawn under the same conditions (plant height, temperature, etc.) and measured the plant height (length) and longest root length after 30 days.
The results were as shown below. Plant height (length)
Longest root length Apiol application garden 9.2cm
42cm Unused garden 15.3cm
46cm From the above results, it was found that Apiol has special physiological activity on grass growth, hardly inhibits root growth, and significantly suppresses plant height growth.

Claims (1)

[Claims] 1 1-allyl-2,5-dimethoxy-3,4-
Methylenedioxybenzene, 1-propenyl-
2,5-dimethoxy-3,4-methylenedioxybenzene, 1-allyl-2,3-dimethoxy-
A plant growth inhibitor containing 4,5-methylenedioxybenzene or 1-allyl-3-methoxy-4,5-methylenedioxybenzene as an active ingredient.