Detail of "98-89-5"

Reference

Detection of chemicals inhibiting photorespiratory senescence in a large scale survival chamber

Detection of chemicals inhibiting photorespiratory senescence in a large scale survival chamber. Manning, David T.; Campbell, Andrew J.; Chen, Tsong Meng; Tolbert, N. E.; Smith, E. Wayne (Union Carbide Agric. Prod. Co. Inc., Research Triangle Park, NC 27709, USA). Plant Physiol., 76(4), 1060-4 (English) 1984. CODEN: PLPHAY. ISSN: 0032-0889. DOCUMENT TYPE: Journal CA Section: 5 (Agrochemical Bioregulators) Section cross-reference(s): 11 A large scale survival chamber was developed as a screen for detecting chem. treatments that extend the survival time of illuminated soybean seedlings at CO2 concns. below the compensation point. In theory, extended survival should indicate potential for improved crop performance via decreased photorespiration and increased photosynthetic efficiency. An automated control system regulated CO2 concns., temp. and plant watering during a continuous CO2-removal photoperiod of 72 h. An endogenous controlled circadian rhythm of net photosynthesis occurred throughout the continuous light treatment. Spray applications of 3.49 mM 2-(4-chlorophenoxy)-2-methylpropanoic acid (CPMP) [94592-92-4] significantly decreased leaf chlorophyll loss, compared with the control, after 72 h of subcompensation-point stress. Treatment with CPMP also consistently increased leaf chlorophyll per unit under nonstress greenhouse conditions. These effects may be due to increases in specific leaf wt. produced by CPMP although the compd. did not consistently act as a height retardant. 3-Butyl-2-hydroxy-4H-pyrido[1,2-a]pyrimidin-4-one (BHPP) [94592-93-5], inhibited senescence under low CO2 conditions but did not decrease leaf light transmission at ambient CO2 levels. N6-Benzyladenine (BA) [1214-39-7] retarded low CO2 stress senescence although greening effects were not obsd. Neither 2-hydroxy-3-butynoic acid [40027-75-6] nor its Bu ester [18418-09-2], inhibitors of glycolate oxidase, influenced low CO2 survival. Cyclohexanecarboxylic acid [98-89-5] and Na naphthenate had no effect upon subcompensation-point senescence. Antisenescence effects of CPMP, BHPP, and BA do not appear to be directly attributable to effects upon the competing C paths of photosynthesis and photorespiration. Protection against low CO2 stress and increased chlorophyll synthesis under nonstress conditions may represent sep. effects upon plastids by some of the compds. This screen will identify compds. which inhibit photorespiratory senescence without decreasing the CO2 compensation point.

Cyclohexanecarboxylic acid esters

Cyclohexanecarboxylic acid esters. (Chisso Corp., Japan). Jpn. Kokai Tokkyo Koho JP 59161334 A2 12 Sep 1984 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07C069-753; C09K003-34. ICA: G02F001-13; G09F009-00. APPLICATION: JP 83-35605 4 Mar 1983. DOCUMENT TYPE: Patent CA Section: 24 (Alicyclic Compounds) Section cross-reference(s): 75 Optically active cyclohexanecarboxylates I (n = 0, 1; X, X1 = p-C6H4, trans-1,4-cyclohexylene; R1 = alkyl), useful as optically active liq. crystals, were prepd.Chemical with cas number 645-56-7 also plays role. by redn. of (S)-(+)-p-EtCHMeCH2C6H4C6H4CO2H-p' (II) with Na/isoamyl alc. and esterification of the resulting carboxylic acid (S)-(+)-III with HOXnX1R1. Thus, 110 g Na was added to 3 g II in isoamyl alc. at 100° to give 2.7 g (S)-(+)-III, refluxing which with 10 mL SOCl2 for 3 h followed by treatment with 1.4 g p-PrC6H4OH in pyridine at room temp. gave 32% (S)-(+)-I (n = 0, X1 = p-C6H4, R1 = Pr). .