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plant growth substance may be one solution to controlling spiking ( Wang, 1995 ). Phalaenopsis is unable to spike and bloom at high temperatures ( Lee and Lin, 1984 ; Wang et al., 2006 ). If a spiked phalaenopsis plant is moved to a high

lanceolata (Rhodophyta) J. Phycology 35 493 500 Audus, L.J. 1953 Plant growth substances Leonard Hill Ltd London, UK Barranco, D. Trujillo, I. Rallo, L. 2005 Elaiografía hispánica

with high temperature and NAA appears to increase germination. The role of PGR in overcoming the harmful effects on growth may be due to the change in endogenous growth substances that they initiate ( Hoque and Haque, 2002 ; Yoshida and Hirasawa, 1996

: Roe, M., J. Burton, and R. Kuhr (eds.). Herbicide activity: Toxicology, biochemistry, and molecular biology. IOS Press, The Netherlands Struckmeyer, B. 1951 Comparative effects of growth substances on stem anatomy, p. 167–174. Plant growth substances

( Booth, 1963 ). These processes in Solanum species, especially S. tuberosum subsp. andigena Hawkes, are controlled by environmental factors, primarily temperature and photoperiod, that regulate levels of endogenous growth substances. Rhizome growth

P deficiency Preparation of the growth substances. The growth substrate used in this study consisted of a mixture of sawdust (P-free with 3–6 mm particles) and sand [1 sawdust: 3 sand (v/v), pH = 6.5], which was prepared on 20 June 2017. All the sand

growth substances and shoot emergence in Freesia hybrida corms J. Amer. Soc. Hort. Sci. 106 455 460 Harbaugh, B.K. Gilreath, J.P. 1986 Influence of rhizome harvest date, length of storage and GA 3 on sprouting and flowering of achimenes Proc. Florida

. Soc. 51 449 450 Dueul, W.A. 2003 U.S. patent no. 6,596,323, Meadowfoam plant material having exogenous plant growth substance and method of use U.S. Patent Office Washington, DC Elsayed, S.F. 1995

and chilling on abscesic acid content and germination in ornamental peach ( Prunus persica Batsch) seeds J. Hort. Sci. Biotechnol. 85 3 136 137 Raghavan, V. Torrey, J.G. 1964 Effects of certain growth substances on the growth and morphogenesis of

. 2002 Ethylene biosynthesis and action in tomato: A model for climacteric fruit ripening J. Expt. Bot. 53 2039 2055 Arteca, N.R. 1995 Plant growth substances: Principles and applications Chapman & Hall New York, NY Bangerth, F. 2000 Abscission and