Genetic Analysis of Yield Components in the PI 438489B by ‘Hamilton’ Recombinant Inbred Line (RIL) Population of Soybean [Glycine max (L.) Merr.]

Abstract

Yield is a multi-factorial trait determined by several genetic traits and highly correlated with important agronomic traits in many crops including soybean. [Glycine max (L.)]. Plant height, seed and pod numbers, and seed weight are all components of yield and polygenic in nature. The objective of this study was to identify quantitative trait loci (QTL) for days to germination, days to flowering, plant height, pod number, seed number, 100-seed weight, and total seed weight in soybean using the using the PI 438489B by 'Hamilton' recombinant inbred line (RIL) population (PIxH, n=50). A total of 18 QTL were found on 10 different chromosomes. Three QTL for days to germination (qDG001-qDG003) have been identified on chromosomes 5b, 6, and 13b. Two QTL (qDF001 and qDF002) have been identified on chromosomes 9 and 13b, respectively. On QTL for plant height (qPH001) have been identified on chromosome 6. Four QTL for pod number (qPN001-qPN004) had been identified on chromosomes 2, 6, and 8 (2 QTL), respectively. Two QTL for seed number (qSN001 and qSN002) have been identified on chromosomes 5b and 11b, respectively. Five QTL for 100-seed weight (qSW001 to qSW005) have been identified on chromosomes 5a, 6, 8, 9, and 11c, respectively. Two QTL for total seed weight (qTSW001 and qTSW002) have been identified on chromosomes 5b and 17c, respectively. The QTL identified here may be introduced in breeding programs to develop soybean cultivars with high yield potential.

Appraisal of soybean RIL population derived from a cross between Spencer by LS97-1610

“…These correlation coefficients confirm the results obtained from Panthee et al (2007) where they found height being positively correlated with lodging (r=0.58) and lodging significantly correlated with maturity (r=0.17). Height was found being positively correlated with yield (r=0.2454); this estimate is close to the one obtained by Bobby et al (2012) which was r=0.307 and lower than the value obtained by Cicek et al (2006) of r=0.58.…”

“…According to Cicek et al (2006), we can expect an improvement in yield in taller plants compared to shorter ones. Also, a non-significant correlation between these two traits has been reported (Bobby et al, 2012;Diondra et al, 2008). Height has been negatively correlated with yield and this may be due to a positive correlation between height and lodging (Yuan et al, 2002).…”

Additional Quantitative Trait Loci and Candidate Genes for Seed Isoflavone Content in Soybean

“…This RIL population was developed by the Agronomy Research Center, Iowa State University by Dr. Silvia Cianzio and was provided to us by Dr. Khalid Meksem of Southern Illinois University. The population was grown in two different seasons and locations (FSU campus, Fayetteville, NC -2010 andSaint Pauls, NC -2011) as described earlier (Ragin, Bazelle, Clark, Kantartzi, Meksem, Akond, and Kassem, 2012). RIL population and parental lines were harvested at maturity and seeds were dried for having samples for isoflavones analysis.…”

Identification of QTLs related to the vertical distribution and seed-set of pod number in soybean [Glycine max (L.) Merri]

“…The number of pods per plant is one of the most agronomically important traits in soybean [ Glycine max (L.) Merri], and is strongly positively correlated with yield [ 1 ]. Numerous studies have mapped quantitative trait loci (QTLs) for pod number, with the aim of increasing the efficiency of breeding for higher yields [ 2 – 18 ]. Previously, 15 QTLs for total pod number per plant (TPNPP) were identified using recombinant inbred lines (RILs) derived from a cross between BARC-8 and Garimpo [ 2 ], while another study identified 12 TPNPP QTLs on chromosomes B1, C2, D1a, F, J, and N using a F 2:10 RIL population derived from a cross between Charleston and Dongnong 594 [ 3 ].…”