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

Abstract

Lodging is an important limiting factor in wheat because it affects growth, yield and grain quality. Plant growth regulators (PGRs) are often used to restrain elongation of internodes, improve lodging traits, and protect yield potentials. 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, the active ingredient of which is chlormequat; and Palisade, the active ingredient of which is trinexapac-ethyl) on yield, stem height and morphological traits in six spring wheat cultivars (AC Carberry, AAC Scotia, Hoffman, Fuzion, FL62R1, and AW725). Both PGRs reduced plant height and caused a 6% to 48% reduction 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 reduced lodging, increased stem diameter, thickness, filling degree, and stem strength, and increased leaf relative chlorophyll content. However, application of PGRs significantly reduced grain yield, and the combination of the two PGRs (Manipulator and Palisade) had a synergistic effect and lowered the yield. In general, the effect of Palisade was more evident than that of Manipulator.

Influence of Fertility Levels and Plant Growth Retardants on Growth and Productivity of Wheat (Triticum aestivum L.) in Jharkhand

“…A chronic worldwide constraint to sustainable wheat production is lodging that often decreases photosynthetic ability and biomass production, deteriorates seed quality, and creates difficulties to harvest operations (Zhang et al,2017) Wheat and rice are highly prone to lodging during late vegetative growth and at reproductive stages ( Shah et al, 2019) exaggerating the need for additional research efforts Lodging in cereals can be defined as the permanent displacement of stems from the vertical position, which could result from either plastic failure of the stem base (stem lodging) or failure of the belowground anchorage system (Berry et al, 2004). The key reasons responsible for wheat lodging are increase in weight of mature ears due to water accumulation, occurrence of high speed winds at grain filling stage, wide use of flat planting and flood irrigation and the lack of acceptable cultivars of wheat that are lodging tolerant at higher nitrogen (N) rates etc.…”

“…The yield potential of high yielding genotypes of wheat under irrigated and high input rates could be achieved consistently and efficiently by finding suitable solutions of lodging problem. In this context, the use of growth retardants found to be most effective for managing the problem of lodging (Zhang et al, 2017). Growth retardants are chemical substances that have the potential to alter structural or vital processes inside the plant by modifying hormone balance to increase yield, improve quality or facilitate harvesting through checking lodging especially in cereals (Zhang et al, 2017).…”

“…In this context, the use of growth retardants found to be most effective for managing the problem of lodging (Zhang et al, 2017). Growth retardants are chemical substances that have the potential to alter structural or vital processes inside the plant by modifying hormone balance to increase yield, improve quality or facilitate harvesting through checking lodging especially in cereals (Zhang et al, 2017). Lodging preventers (plant height retardants) are generally antagonistic to gibberellin and act by altering their metabolism (Peake et al, 2014) and for aforesaid reason they are frequently called anti-gibberellin.…”

Effects of Plant Growth Regulators and N Rate on the Morphological Traits of Generative Tillers and Seed Yields of Chewings and Strong Creeping Red Fescue

“…[30] argued that a significant increase in the seed yield of red fescue despite the lack of significant effects on straw length suggests that TE had an influence on the physiological processes affecting yield. A study on the application of TE on wheat showed that TE increased leaf relative chlorophyll content of the plant [31]. TE applied on creeping bentgrass increased relative water content and chlorophyll content.…”

“…A research on wheat enables a deeper understanding of the impact of PGRs on the morphological traits of plant's internodes and lodging. According to Zhang [31], the use of TE increased the stem strength (second basal internode), stem diameter, wall thickness, and also, enhanced lodging resistance at the anatomical level of the plants. Moreover, TE was extremely effective in reducing plant height.…”