03448naa a2200277 a 450000100080000000500110000800800410001902200330006002400270009310000200012024501450014026000090028550004900029452020500078465300680283465300260290265300170292865300180294565300120296365300170297565300100299270000200300270000180302270000190304077301110305910648982024-10-28       2024    bl uuuu     u00u1 u    #d  a0931-2250; e-ISSN: 1439-037X7 a10.1111/jac.127642DOI1 aPLOSCHUK, R. A.  aIdentifying the numerical components affecting soybean (Glycine max) yield under waterlogging at reproductive stages.h[electronic resource]  c2024  aArticle history: Received 30 May 2024, Revised 1 September 2024, Accepted 3 September 2024. -- Correspondence: Ploschuk, R.; Facultad de Agronomía, IFEVA, Universidad de Buenos Aires, CONICET, Buenos Aires, Argentina; email:rploschuk@agro.uba.ar  -- Funding: This work was supported by Universidad de Buenos Aires (UBACyT 20020220300073BA) and Agencia Nacional de Promoción de la Investigación, Desarrollo Tecnológico y la Innovación (Grant number ANPCyT PICT-PICT-2021-00056). --  aABSTRACT.- Waterlogging is a critical abiotic stress increasing in importance due to more intense, erratic rainfall associated with climate change. Waterlogging leads to significant yield losses in sensitive crops, such as soybean (Glycine max [L.] Merr.). Identifying soybean genotypes and traits associated with better waterlogging tolerance is of high interest. We assessed the response of six soybean genotypes, selected from a field screening of over 190 genotypes, to 10 days of waterlogging at the R1 (onset of flowering) and R4 (grain filling) stages. We evaluated yield and its components, as well as shoot and root dry weights (DW) at the end of the waterlogging treatments and at maturity, along with morphological traits such as plant branch number, stem diameter and plant height. By integrating all these traits, a waterlogging tolerance index (WTI) was calculated for each genotype to rank their sensitivity. The WTI showed variations among genotypes from 0.61 to 0.77, indicating genotypic variation in response to waterlogging. Greater reductions in root DW compared to shoot DW were observed immediately after waterlogging. By maturity, shoot DW of waterlogged plants was more severely reduced than root DW in all genotypes. Despite similar DW losses at R1 and R4 at physiological maturity, seed number per plant and 100-seed weight responses differed between the treatments. Genotypes that performed well under control conditions suffered significant yield reductions of 70%-85% after waterlogging, mainly due to fewer fertile nodes and seeds per pod, with some also experiencing a notable decrease in 100-seed weight. In contrast, other genotypes had milder responses, with less severe reductions in seed and pod traits. Identifying breeding soybean genotypes tolerant to waterlogging during reproductive stages that maintain the number of fertile nodes and pods per node without changes in seeds per pod could significantly mitigate yield losses from waterlogging. © 2024 Wiley-VCH GmbH. Published by John Wiley & Sons Ltd.  aÁREA DE MEJORAMIENTO GENÉTICO Y BIOTECNOLOGÍA VEGETAL - INIA  aGenotypic variability  aRoot biomass  aShoot biomass  aSoybean  aWaterlogging  aYield1 aMIRALLES, D. J.1 aKAVANOVÁ, M.1 aSTRIKER, G. G.  tJournal of Agronomy and Crop Science, 2024, Volume 210, Issue 5, e12764. https://doi.org/10.1111/jac.12764