Phenotypic plasticity in a soybean cultivar with indeterminate growth type

The minimum optimal seeding rate in soybean [Glycine max (L.) Merr.] is the least seeds required to achieve optimal yield. This is a function of the crop phenotypic plasticity in response to plant density. However, the effect of seeding rate reduction on the seed composition and yield of cultivars with contrasting branching potentials needs to be better elucidated. The objectives were to evaluate the impacts of reducing the seeding rate on production and to quantify the minimum optimal seeding rate for seed, oil, and protein yield in soybean cultivars with contrasting plant architectures. The field experiment was conducted for two growing seasons in a 5 × 2 factorial scheme in a randomized complete block design with five replications. The treatments consisted of five seeding rates (100, 80, 60, 40, and 20% of the recommended seeding rate) and two indeterminate cultivars (BRS 1010IPRO and NS 5959IPRO). Both cultivars showed a minimum optimal seeding rate below the recommended rate. Pods per m 2 and the number of seeds per pod were the yield components responsible for the compensatory effect in response to lowering the seeding rate. Thousand seed weight was the main yield component responsible for yield loss below the minimum optimal seeding rate. Both cultivars showed high branch yield in response to seeding rate reduction. BRS 1010IPRO has a higher potential for seeding rate reduction than NS 5959IPRO. The minimum optimal seeding rate for seed yield in NS 5959IPRO led to lower protein yield and higher oil yield.Abbreviations: GS, growing season; MOSR, minimum optimal seeding rate; SR, seeding rate.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

show abstract

“…This showed that NSP is not the main yield component responsible for the compensatory effect, as Balbinot Junior et al. (2018) concluded.…”

Section: Resultsmentioning

confidence: 79%

Minimum optimal seeding rate for indeterminate soybean cultivars grown in the tropics

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Both cultivars showed higher mortality as the density of sourgrass increased, given a decrease in the density of soybean plants for both (Figure 4). Still, soybeans have phenotypic plasticity, which is associated with plant ability to compensate losses in grain production due to failures in population density (BALBINOT JÚNIOR et al, 2018). On the other hand, when the number of sourgrass plants ha -1 is reduced, a negative effect on crop yield can occur.…”

Section: Experiments 3 Simulation Of Areas With Sourgrass and Soybean Plants Emerging Simultaneouslymentioning

confidence: 99%

Sourgrass Interference on Soybean Grown in Brazilian Cerrado

et al. 2021

View full text Add to dashboard Cite

Sourgrass (Digitaria insularis) is one of the main species causing significant losses in Brazilian soybean production systems. Thus, this paper aimed to evaluate sourgrass interference on soybeans grown under Cerrado conditions. Three field experiments were conducted, of which the first two (E1 and E2) simulated sourgrass after pre-sowing burndown, using plants already emerged by the time soybeans were sown; whereas the third (E3) simulated both sourgrass and soybeans emerged simultaneously. Both E1 and E2 were conducted in a randomized complete block design (RCBD) with five treatments based on sourgrass infestation densities (0, 2, 4, 6, and 8 plants m-2) and four replications. In turn, E3 was also carried out in an RCBD but with treatments arranged in a 2 x 5 factorial and four replications. The first factor comprised two soybean cultivars, while the second was sourgrass density levels, just as in E1 and E2. The results showed that increasing sourgrass densities reduced soybean yield regardless of the plant growth stage when the crop was sown. Yield losses were higher when sourgrass plants were already established by the time soybean was sown. Soybean yield losses reached up to 80% under higher sourgrass infestation levels.

show abstract

“…Normally, larger plants have greater water demand, compromising the formation of pods and the grain-filling (Farias et al, 2007). In a study conducted by Balbinott Júnior et al (2018), the authors observed that the number of pods per plant was the variable that most contributed to explaining the phenotypic plasticity in soybean plants.…”

Section: Source Ofmentioning

confidence: 99%

Performance of soybean cultivars under drought stress and sowing seasons in Brazilian Savannah

Naoe

Pelúzio

Tavares

et al. 2022

View full text Add to dashboard Cite

Objective: Evaluate the performance of two soybean cultivars submitted to water deficit in two sowing seasons (July 10, 2019, and October 27, 2020), in Tocantinense Savannah, Brazil. Methodology: The experiments were carried out in a greenhouse, in pots. The experimental design used in each experiment was completely randomized in a 4 x 2 factorial scheme with four replications, represented by four irrigation management systems (water deficit in the flowering, grain filling and maturation stages, and without water deficit) and two cultivars (TMG132RR™ and TMG1288RR™). The means were grouped by the Scott-Knott test at 5% significance. The characteristics evaluated were: number of seeds per plant, mass of one hundred seeds in grams, number of pods per plant, plant height and grain yield per hectare (GY) in kilograms. Results: In the two seasons, the water deficit during grain filling affected the number of pods and seeds per plant, the 100 seeds mass, and the grain yield of both cultivars. Implications: The water availability and sowing seasons are environmental factors with the greatest impact on cropping. Therefore, understanding how cultivars behave in adverse environmental situations is of great importance to management programs. Conclusions: The cultivar TMG132RR™ was less sensitive to water deficit, whereas the cultivar TMG1288RR™ was more productive under adequate conditions of temperature and water availability.

show abstract

Phenotypic plasticity in a soybean cultivar with indeterminate growth type

Cited by 20 publications

References 15 publications

Minimum optimal seeding rate for indeterminate soybean cultivars grown in the tropics

Minimum optimal seeding rate for indeterminate soybean cultivars grown in the tropics

Sourgrass Interference on Soybean Grown in Brazilian Cerrado

Performance of soybean cultivars under drought stress and sowing seasons in Brazilian Savannah

Contact Info

Product

Resources

About