How breeding of Brazilian soybean cultivars modified morphophysiological attributes of plants?

Umburanas, Renan Caldas

doi:10.11606/t.11.2019.tde-12082019-104842

Cited by 1 publication

(5 citation statements)

References 8 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The aim of this study was to evaluate the dynamics of N and its partitioning in the soybean plant in a historical series of soybean cultivars. We found that there was an increase in the total soybean N accumulation with year of release, which was driven by modern cultivars producing more protein-rich grain, as was found by Umburanas (2019). Although the allocation of both dry matter and N to grain increased with year of release, the increase in the N Harvest Index was less pronounced than the increase in the Harvest Index.…”

Section: Discussionsupporting

confidence: 62%

“…Meteorological data collected in a meteorological station located about 100 m away from the planting area were quite similar in both years, with average temperatures of 20.6 and 20.3 ºC, respectively; 2584 and 2537 MJº m -2 for the cumulative solar radiation; and the cumulative rainfall was 823 and 984 mm, respectively. There were no problems of water stress in this season as reported in Umburanas (2019), and for the southern region of Brazil, 800 mm of rainfall are considered sufficient for a soybean crop (ZANON et al, 2016).…”

Section: Methodsmentioning

confidence: 61%

“…According with Umburanas (2019) in the greenhouse study, the regression line had an average soybean grain yield ranging from 511 g m -2 the 1965 cultivar to 609 g m -2 in the 2012 cultivar (Figure 8A). The rate of yield increase was 2.08 kg ha -1 per year.…”

Section: Soybean Dry Matter Allocation and Tissue N Concentrations By...mentioning

confidence: 89%

“…Many of the modifications that we observed due to breeding could be considered positive. For example, Umburanas (2019) found that soybean grain yield increased by 3.9 g m -2 per year. This is rate of yield increase is greater than what was shown in research by Jin et al, (2011), Long, (2013, Rowntree et al, (2013), who found yield increased around 3.1 g m -2 per year in United States and China and around 2.8 g m -2 globally.…”

Section: Discussionmentioning

confidence: 99%

“…Along with seed yield, whole plant dry matter has increased, though less than seed yield (TAMAGNO et al, 2020). Despite higher yields and N removal per unit area in modern soybean cultivars (UMBURANAS, 2019;ORTEZ et al, 2018), some authors have observed a reduction in the grain protein (and N) concentration in the United States (RINCKER et al, 2014;ROWNTREE et al, 2013;WILCOX et al, 1979) andin Brazil (TODESCHINI et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamics of nitrogen partitioning in a historical set of soybean cultivars

Inoue¹

View full text Add to dashboard Cite

Dynamics of nitrogen partitioning in a historical series of soybean cultivarsIn the soybean crop, nitrogen (N) is one of the most important nutrients. However, this element has been little explored in relation to changes that occurred in the species during the improvement and selection of cultivars. Thus, the aim of this study was to evaluate how soybean breeding in Brazil in the last 50 years has impacted soybean N accumulation, N partitioning to grains, and grain protein concentration. Two experiments were carried out, one in the field in two growing seasons (Experiment I) and the other in a greenhouse (Experiment II). Experiment I was conducted for two years, the 2016/2017 and 2017/2018 growing seasons, and Experiment II in one growing season. In both experiments a randomized block design was used. Seeds of representative cultivars launched in the period between 1965 and 2016 were obtained, and for Experiments I and II, 26 and 25 cultivars were used, respectively. In Experiment I the plants were sampled during the beginning of grains formation (R5) and at harvest (R8), while in Experiment II they were sampled when the plant was with 4 vegetative nodes (V4), at flowering (R1), in the beginning of pod formation (R3), in addition to R5 and R8. During crop growth, N accumulation in biomass, N concentration, N utilization efficiency, and N partitioning were evaluated. For Experiment I, N accumulation increased throughout the year of release of the cultivars (YOR) in plant and grain biomass while the residual N (remaining in the straw) decreased. The N concentration decreased in grains, biomass and residue along the YOR. There was a greater efficiency of N utilization in modern cultivars compared to older ones, and the ratio of nitrogen harvest index (NHI) to harvest index (HI) decreased with the YOR. For Experiment II, dry mass showed a positive trend for grains and biomass along the YOR and negative for the residue, the N accumulation showed the same trend as Experiment I but it was non-significant. The N concentration decreased along the YOR in grains and residue and increased slightly in biomass. The N utilization efficiency increased and there a negative relationship between the NHI:HI ratio and the YOR. Thus, it was concluded that there was an increase in the grain N content of more modern cultivars, but there was a more intense increase in the grain dry mass, which caused a dilution in the amount of total N present especially in the grain, a greater efficiency in use. of N and a smaller ratio between the NHI: HI and the YOR ratio.

show abstract

Section: Discussionsupporting

confidence: 62%

Section: Methodsmentioning

confidence: 61%

Section: Soybean Dry Matter Allocation and Tissue N Concentrations By...mentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%