Just Enough Nitrogen: Summary and Synthesis of Outcomes

Sutton, Mark A.; Mason, Kate; Bleeker, A.; Hicks, W. Kevin; Masso, Cargele; Raghuram, Nandula; Reis, Stefan; Bekunda, Mateete

doi:10.1007/978-3-030-58065-0_1

Cited by 3 publications

(1 citation statement)

References 51 publications

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“…ABs populations increase the precision in detection of QTLs because the different genotypes share a common genetic background that differs only in one or a few introgressed genomic fragments of the donor species [ 31 ]. Effective fertilizer management is crucial for improving sustainability, with NUE being a critical breeding goal due to its significant impact on economic and environmental factors [ 7 , 33 , 34 ]. Several studies have been conducted to improve NUE through breeding in different crops, particularly in cereals and potato [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of three sets of advanced backcrosses of eggplant with wild relatives from different gene pools under low N fertilization conditions

Villanueva

Plazas

Gramazio

et al. 2023

Horticulture Research

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The development of new cultivars with improved nitrogen use efficiency (NUE) is key for implementing sustainable agriculture practices. Crop wild relatives (CWRs) provide valuable genetic resources for breeding programs aimed at achieving this goal. In this study, three eggplant (Solanum melongena) accessions together with their advanced backcrosses (ABs; BC3 to BC5 generations) were evaluated for 22 morpho-agronomic, physiological, and N use efficiency (NUE) traits under low nitrogen fertilization conditions. The ABs were developed with introgressions from the wild relatives S. insanum, S. dasyphyllum, and S. elaeagnifolium. The AB population comprised a total of 25, 59, and 59 genotypes, respectively, with overall donor wild relative genome coverage percentages of 58.8%, 46.3%, and 99.2%. The three S. melongena recurrent parents were also evaluated under control (normal) N fertilization. Reduction of N fertilization in the parents resulted in decreased chlorophyll content-related traits, aerial biomass, stem diameter and yield, and increased NUE, nitrogen uptake efficiency (NUpE), and nitrogen utilization efficiency (NUtE). However, the decrease in yield was moderate, ranging between 62.6% and 72.6%. A high phenotypic variation was observed within each of the three sets of ABs under low nitrogen conditions, with some individuals displaying improved transgressive characteristics over the recurrent parents. Using the SPET 5k probes platform for high-throughput genotyping, we observed a variable but high degree of recurrent parent genome recovery in the ABs attributable to the lines recombination, allowing the successful identification of 16 QTLs. Different allelic effects were observed for the introgressed QTL alleles. Several candidate genes were identified in the QTL regions associated with plant growth, yield, fruit size, and NUE-related parameters. Our results show that eggplant materials with introgressions from CWRs can result in a dramatic impact in eggplant breeding for a more sustainable agriculture.

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Section: Discussionmentioning

confidence: 99%

Evaluation of three sets of advanced backcrosses of eggplant with wild relatives from different gene pools under low N fertilization conditions

Villanueva

Plazas

Gramazio

et al. 2023

Horticulture Research

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Reactive Nitrogen in Climate Change, Crop Stress, and Sustainable Agriculture

Raghuram

2023

Global Climate Change and Plant Stress Management

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Brazilian soybeans as feed for livestock in Europe: an insight into the nitrogen flows

et al. 2023

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Given the agricultural demand to supply animals with food, the scope of today’s soybean production and international trade can influence the nitrogen cycle. Rather than using soybeans from within the region of animal production, animal producers import nutritional supplements from distant growers. This widely opens the biogeochemical cycle of nitrogen, which reduces local recycling and increases carriage of reactive nitrogen via the supply chain. Ultimately, this potentiates the effects of a “nitrogen cascade” process. This study estimates nitrogen flows for Brazilian soybean transported to feed European livestock and attempts to quantify the understanding of how this flow can impact the nitrogen cascade effect. The hypothesis is that the growing trade of Brazilian soybean products is sufficient to spike reactive nitrogen production that can potentially cause distant environmental impacts of the nitrogen cascade. In this respect, the estimation of the nitrogen flows was evaluated using material flow analysis, and the cascade effect was quantified by means of a nitrogen cascade indicator (NCI). Notably, NCI can calculate the released amount of nitrogen in the environment along the entire supply chain of livestock products. NCI-based evaluation of Brazilian soybean products consumed by European livestock indicated the accumulation of nitrogen levels. There was also an increase in nitrogen flows in the Brazilian phase (0.058 Gg in 2007 to 139.86 Gg in 2019 for soybean meal; 584.28 Gg in 2007 to 309.78 Gg in 2019 for soybeans) accompanying a stability in European livestock production. This highlights the necessity for adjustments in nitrogen circularity between all levels of food production and improved strategies of more localised feed autonomy for sustainable global development. Supplementary Information The online version contains supplementary material available at 10.1007/s10113-023-02034-1.

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Just Enough Nitrogen: Summary and Synthesis of Outcomes

Cited by 3 publications

References 51 publications

Evaluation of three sets of advanced backcrosses of eggplant with wild relatives from different gene pools under low N fertilization conditions

Evaluation of three sets of advanced backcrosses of eggplant with wild relatives from different gene pools under low N fertilization conditions

Reactive Nitrogen in Climate Change, Crop Stress, and Sustainable Agriculture

Brazilian soybeans as feed for livestock in Europe: an insight into the nitrogen flows

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