An integrated genetic map based on four mapping populations and quantitative trait loci associated with economically important traits in watermelon (Citrullus lanatus)

Table 3 Mean value, variance components and heritability for sugar content traits of the 97103 × PI 296341-FR watermelon RIL population in two years

Traits	Env	Parental lines		RILs			Parameter
		97103	PI296341	Mean	Min	Max	Genotype (G)	GEI	h²%	95% CI on h²
Brix	2010	11.0	0.8	3.45	0.50	8.80	3.42 ± 0.49^**	0.12 ± 0.03^**	96.94	95.47–97.93
	2012	10.2	1.3	3.46	0.58	8.60	3.42 ± 0.49^**	0.12 ± 0.03^**	96.94	95.47–97.93
Fructose	2010	30.0	4.0	15.32	1.57	40.19	63.98 ± 10.00^**	11.92 ± 2.17^**	89.21	84.06–92.70
	2012	32.5	3.9	18.51	5.92	43.47	63.98 ± 10.00^**	11.92 ± 2.17^**	89.21	84.06–92.70
Glucose	2010	17.5	2.0	9.65	1.05	28.08	24.11 ± 3.94^**	5.87 ± 1.14^**	85.7	78.87–90.32
	2012	20.0	1.5	12.42	2.85	29.62	24.11 ± 3.94^**	5.87 ± 1.14^**	85.7	78.87–90.32
Sucrose	2010	45.2	0.4	1.97	0.08	20.50	4.79 ± 1.09^**	3.35 ± 0.75^**	64.59	47.68–76.03
	2012	40.2	0.1	0.94	0.10	15.56	4.79 ± 1.09^**	3.35 ± 0.75^**	64.59	47.68–76.03

^*, ^**indicate significance at P < 0.05 and 0.01, respectively. GEI: Genotype by Environment Interaction; CI: confidence intervals. The unit of Brix is degress and unit of fructose, glucose and sucrose content is milligram per gram fresh fruit.

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