Marker-assisted selection strategy to pyramid two or more QTLs for quantitative trait-grain yield under drought

Rice

Table 3 Mean comparison of QTL classes of grain yield (kg ha⁻¹) across BC₁F₃ to BC₁F₈ generations under reproductive-stage drought stress and irrigated non-stress control conditions in Samba Mahsuri background at IRRI, Philippines

QTL class	QTL	2013DS	2013DS	2014WS	2015WS	2015WS	2016DS	2016DS
		NS	RS	NS	NS	RS	NS	RS
		BC₁F₃	BC₁F₃	BC₁F₆	BC₁F₇	BC₁F₇	BC₁F₈	BC₁F₈
Population size
		42	42	70	20	20	20	20
A	qDTY _2.2	2020 a	1069 bc	3405 b	3327 b	44 a	–	–
B	qDTY _4.1	1900 a	894 b	3340 b^†	4727 d^†	184 b^†	5643 b^†	33 a
C	qDTY_2.2 + qDTY_4.1	2916 b	1296 c	3270 b	4161 c	110 ba	4999 a	216 b
X	Parent	2742 b	0 a	2137 a	1945 a	15 a	4051 a	39 a
	Trial Mean	2395	815	3038	3540	88	5198	96
F- value		31.22	46.37	11.18	43.03	2.12	19.98	62.66
p-value		0.0089	< 0.0001	< 0.0001	< 0.0001	0.09	< 0.0001	< 0.0001

The letter display are QTL class labels ordered by mean grain yield of QTL class. Means followed by the same letter (within a column) are not significantly different, DS dry season, WS wet season, NS non-stress, RS reproductive-stage drought stress, X recipient parent (no QTL), ^†Mean data of only 2 lines