Abstract
Uniconazole [(E)-(p-chlorophenyl)-4, 4-dimethyl-2-(1,2,4-triazol-1 -yl)-1 -penten-3-ol] belongs to a group of triazoles which, in addition to their fungitoxic and plant growth-regulating (PGR) properties, protect plants from various stresses. Compared to the conventional methods of treatment which include seed, soil drench, and foliar spray, the present study shows that a convenient and simple method of administering the chemical is by imbibing wheat (Triticum aestivum L. cv. Frederick) seeds in uniconazole solution for 20 h. The soaked seeds can be stored after air drying and germinated when desired. Addition of potassium to the uniconazole solution and exposure of the seeds to 40°C for the last 2 h during the imbibition period further enhanced the PGR effectiveness and improved the efficacy of the uniconazole-induced protection against drought and low- and high-temperature stresses. Uniconazole increased both carotenoid and chlorophyll levels and in combination with KCl, the increase in chlorophyll was more than twice that of the controls. The combination pretreatment of the imbibed seeds used in this study not only magnifies the protective and PGR effects of uniconazole but also supports the concept of acclimation and cross-tolerance.
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References
Abbas S, Fletcher RA, Murr DP (1989) Alteration of ethylene synthesis in cucumber seedlings by triadimefon. Can J Bot 67:278–280
Asare-Boamah NK, Fletcher RA (1986) Protection of bean seedlings against heat and chilling injury by triadimefon. Physiol Plant 67:353–358
Asare-Boamah NK, Hofstra G, Fletcher RA, Dumbroff EB (1986) Triadimefon protects bean plants from water stress through its effects on abscisic acid. Plant Cell Physiol 27:383–390
Bonham-Smith PC, Kapoor M, Bewley JD (1988) Exogenous application of abscisic acid or triadimefon affects the recovery ofZea mays seedlings from heat shock. Physiol Plant 73:27–30
Davis TD, Steffens GL, Sankhla N (1988) Triazole plant growth regulators. In: Janick J (ed) Horticultural reviews, vol. 10. Timber Press, Portland, Oregon, pp 63–105
Fletcher RA (1985) Plant growth regulating properties of sterolinhibiting fungicides. In: Purohit SS (ed) Hormonal regulation of plant growth and development, vol. 2. Bot. Publ., India, pp 103–113
Fletcher RA, Arnold V (1986) Stimulation of cytokinins and chlorophyll synthesis in cucumber cotyledons by triadimefon. Physiol Plant 66:197–201
Fletcher RA, Hofstra G (1985) Triadimefon a plant multiprotectant. Plant Cell Physiol 26:775–780
Fletcher RA, Hofstra G (1988) Triazoles as potential plant protectants. In: Berg D, Plempel M (eds) Sterol biosynthesis inhibitors. Ellis Horwood Ltd., Cambridge, pp 321–331
Fletcher RA, Kallidumbil V, Steele P (1982) An improved bioassay for cytokinins using cucumber cotyledons. Plant Physiol 69:675–677
Fletcher RA, McCullagh D (1971) Cytokinin-induced chlorophyll formation in cucumber cotyledons. Planta 101:88–90
Fletcher RA, Nath V (1984) Triadimefon reduces transpiration and increases yield in water stressed plants. Physiol Plant 62:422–426
Fletcher RA, Hofstra G, Gao J (1986) Comparative fungitoxic and plant growth regulating properties of triazole derivatives. Plant Cell Physiol 27:367–371
Fletcher RA, Santakumari M, Murr DP (1988) Imposition of water stress in wheat seedlings improves the efficacy of uniconazole-induced thermal resistance. Physiol Plant 74:360–364
Gao J, Hofstra G, Fletcher RA (1988) Anatomical changes induced by triazoles in wheat seedlings. Can J Bot 66:1178–1185
Harvey BMR, Lu BC, Fletcher RA (1974) Benzyladenine accelerates chloroplast differentiation and stimulates photosynthetic enzyme activity in cucumber cotyledons. Can J Bot 52:2581–2586
Hofstra G, Krieg LC, Fletcher RA (1989) Uniconazole reduces ethylene and 1-aminocyclopropane-1-carboxylic acid and increases spermine levels in mung bean seedlings. J Plant Growth Regul 8:45–51
Izumi K, Nakagawa S, Kobayashi M, Oshio H, Sakurai A, Takahashi N (1988) Levels of IAA, cytokinins, ABA and ethylene in rice plants as affected by a gibberellin biosynthesis inhibitor, uniconazole-P. Plant Cell Physiol 29:97–104
Levitt J (1980) Comparative stress responses. In: Levitt J (ed) Responses of plants to environmental stresses. Academic Press, New York, pp 533–570
Lin CY, Roberts JK, Key JL (1984) Acquisition of thermotolerance in soybean seedlings. Synthesis and accumulation of heat shock proteins and their cellular localization. Plant Physiol 74:152–160
MacKay CE, Senaratna T, McKersie BD, Fletcher RA (1987) Ozone induced injury to cellular membranes inTriticum aestivum and protection by triazole S-3307. Plant Cell Physiol 28:1271–1278
Senaratna T, MacKay CE, McKersie BD, Fletcher RA (1988) Triazole-induced chilling tolerance in tomato and its relationship to antioxidant content. J Plant Physiol 133:56–61
Siefermann-Harms D (1987) The light harvesting and protective functions of carotenoids in photosynthetic membranes. Physiol Plant 69:561–568
Smillie RM, Hetherington SE (1983) Stress tolerance and stressinduced injury in crop plants measured by chlorophyll fluorescence in vivo. Plant Physiol 72:1043–1050
Wang SY, Steffens GL (1985) Effect of paclobutrazol on water stress-induced ethylene biosynthesis and polyamine accumulation in apple seedling leaves. Phytochemistry 24:2185–2190
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Fletcher, R.A., Hofstra, G. Improvement of uniconazole-induced protection in wheat seedlings. J Plant Growth Regul 9, 207–212 (1990). https://doi.org/10.1007/BF02041964
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DOI: https://doi.org/10.1007/BF02041964