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Effect of Selected Plant Growth Regulators on Yield and Stem Height of Spring Wheat in Ontario

Zhang, Yuxue & Su, Shengnan & Tabori, Mirko & Yu, Junjie & Chabot, Denise & Baninasab, Bahram & Wang, Xuelian & Ma, Bao-Luo & Li, Chunyan & Khanizadeh, Shahrokh. (2017). Effect of Selected Plant Growth Regulators on Yield and Stem Height of Spring Wheat in Ontario. Journal of Agricultural Science. 9. 30. 10.5539/jas.v9n12p30.

Abstract

Lodging is an important limiting factor in wheat because it affects the yield. Plant growth regulators (PGRs) are widely used to restrain elongation of internodes, improve lodging traits, and increase crop yields. An experiment was set up in the greenhouse at the Ottawa Research and Development Centre (ORDC) to study the effect of the selected PGRs (Manipulator and Palisade) on yield, stem height and morphological traits in six spring wheat cultivars (AC Carberry, AAC Scotia, Hoffman, Fuzion, FL62R1, and AW725). PGRs significantly reduced grain yield, and the combination of the two PGRs (Manipulator and Palisade) had a synergistic effect and lowered the yield. PGRs caused a 6% to 48% reduction in plant height and in the length of the second basal internode. The mixture of the two PGRs had a synergistic affect and made the stem shorter. The application of PGRs significantly improved lodging, increased diameter, thickness, filling degree, culm lodging resistance, and stem strength, and increased the relative chlorophyll content. In general, the effect of Palisade was more evident than that of Manipulator.

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