J Integr Plant Biol. ›› 2018, Vol. 60 ›› Issue (3): 232-241.DOI: 10.1111/jipb.12612

• Molecular Physiology • Previous Articles     Next Articles

Quantitative trait loci associated with soybean seed weight and composition under different phosphorus levels

Gokhan Hacisalihoglu1*, Amy L. Burton2, Jeffery L. Gustin3, Selim Eker4, Safiye Asikli4, Elif Hakli Heybet4, Levent Ozturk5, Ismail Cakmak5, Atilla Yazici5, Kent O. Burkey2, James Orf6 and A. Mark Settles3   

  1. 1Department of Biological Sciences, Florida A&M University, Tallahassee, FL 32307, USA
    2United States Department of Agriculture, Agricultural Research Service, Plant Science Research Unit, Raleigh, NC 27607, USA
    3Horticultural Science Department, University of Florida, Gainesville, FL 32611, USA
    4Department of Soil Science & Plant Nutrition, Cukurova University, 01330 Adana, Turkey
    5Faculty of Engineering & Natural Sciences, Sabanci University, 34956 Istanbul, Turkey
    6Department of Agronomy & Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
  • Received:2017-10-03 Accepted:2017-11-10 Published:2018-03-14
  • About author:*Correspondences: Email: Gokhan Hacisalihoglu (gokhan.h@famu.edu)

Abstract:

Seed size and composition are important traits in food crops and can be affected by nutrient availability in the soil. Phosphorus (P) is a non-renewable, essential macronutrient, and P deficiency limits soybean (Glycine max) yield and quality. To investigate the associations of seed traits in low- and high-P environments, soybean recombinant inbred lines (RILs) from a cross of cultivars Fiskeby III and Mandarin (Ottawa) were grown under contrasting P availability environments. Traits including individual seed weight, seed number, and intact mature pod weight were significantly affected by soil P levels and showed transgressive segregation among the RILs. Surprisingly, P treatments did not affect seed composition or weight, suggesting that soybean maintains sufficient P in seeds even in low-P soil. Quantitative trait loci (QTLs) were detected for seed weight, intact pods, seed volume, and seed protein, with five significant QTLs identified in low-P environments and one significant QTL found in the optimal-P environment. Broad-sense heritability estimates were 0.78 (individual seed weight), 0.90 (seed protein), 0.34 (seed oil), and 0.98 (seed number). The QTLs identified under low P point to genetic regions that may be useful to improve soybean performance under limiting P conditions.

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