Reference

Studies of sites of action of a new plant growth retardant (E)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol (S-3307) and comparative effects of its stereoisomers in a cell-free system from Cucurbita maxima

Studies of sites of action of a new plant growth retardant (E)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3-ol (S-3307) and comparative effects of its stereoisomers in a cell-free system from Cucurbita maxima. Izumi, Kazuo; Kamiya, Yuji; Sakurai, Akira; Oshio, Hiromichi; Takahashi, Nobutaka (Takarazuka Res. Cent., Sumitomo Chem. Co., Ltd., Takarazuka 665, Japan). Plant Cell Physiol., 26(5), 821-7 (English) 1985. CODEN: PCPHA5. ISSN: 0032-0781. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Section cross-reference(s): 11 S-3307 (I) [76714-83-5], was investigated to det. the inhibitory sites in gibberellin biosynthesis and the comparative effects of its stereoisomers in a cell-free system from C. maxima. After treatment with I, the incorporation of 14C-labeled mevalonic acid [150-97-0] into GA12-aldehyde [19436-07-8] and GA12 [1164-45-0] clearly was inhibited, and kaurene [34424-57-2] accumulated. Feeding expts. showed that I inhibited the oxidn. of kaurene, kaurenol [2300-11-0] and kaurena [14046-84-5], but did not affect the oxidn. of kaurenoic acid [6730-83-2]. Thus, the reaction sites of I in gibberellin biosynthesis were the 3 oxidn. steps from kaurene to kaurenoic acid. Because I has an asym. center and a tri-substituted double bond, there are 4 stereoisomers; 2 optical isomers and 2 geometrical isomers. The activities of these isomers as a growth retardant and gibberellin biosynthesis inhibitor were examd. with a rice seedling assay and the cell-free system. The relative activity of these isomers was basically the same in the 2 assay methods. The (S)-(E) [83657-17-4] form was the most active, being 7-fold more active in the cell-free system and 70-fold more active in the bioassay than the (R)-(E) [83657-16-3] form. The (RS)-(Z) [98243-94-8] form showed no activity in the cell-free system, but weak dwarfing effects in the rice seedling assay.

A new anti-lodging agent for rice, "Lomica"

A new anti-lodging agent for rice, "Lomica". Sekimoto, Hitoshi; Miyata, Nobuyoshi; Katayama, Yasuyuki; Ohnishi, Junichi; Itoh, Seiichi; Oshio, Hiromichi (Sumitomo Kagaku Kogyo K. K., Osaka, Japan). Sumitomo Kagaku (Osaka), (2), 38-53 (Japanese) 1991. CODEN: SKAADZ. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Lomica is a new anti-lodging agent for rice contg.Several reagents such as 83657-17-4 is used here. 0.04% uniconazole-P as the active ingredient. Lomica (20-30 kg/ha) is applied to flooded water at the growth stage of 20 to 10 days before heading. By this application rice culm length can be shorten and rice plant can be prevented from lodging. The physicochem. properties., formulation, efficacy, toxicol. and environmental assessment of Lomica are discussed. .