Improvement of drought tolerance in rice using line X tester mating design and biochemical molecular markers

Bulletin of the National Research Centre

Table 5 Evaluated of GCA effects in eight rice parents of all studied traits for the two experiments of normal and drought stress conditions

Parents	Heading date (days)		Plant height (cm)		Number of filled grains/ panicle		1000−grain weight (g)		Grain yield/plant (g)
Parents	N	S	N	S	N	S	N	S	N	S
Lines
L₁	4.89**	13.78**	2.77**	6.82**	− 9.37**	− 3.80**	− 7.36**	− 5.18**	− 14.71**	− 1.54**
L₂	36.80**	20.26**	8.84**	14.38**	− 12.70**	− 6.28**	− 29.38**	− 21.04**	− 2.42**	− 4.67**
L₃	− 54.22**	− 69.27**	− 17.60**	− 28.18**	58.59**	36.44**	61.22**	37.96**	33.28**	44.87**
L₄	2.46**	13.09**	3.60**	2.91**	− 31.08**	− 19.18**	− 14.45**	− 7.04**	− 9.12**	− 15.62**
L₅	10.07**	22.14**	2.39**	4.07**	− 5.44**	− 7.18**	− 10.03**	− 4.70**	− 7.03**	− 23.04**
LSD 0.05	1.39	1.27	1.68	1.52	3.48	2.78	4.28	3.91	1.09	1.03
0.01	1.67	1.83	2.11	2.41	4.16	3.42	5.36	4.35	1.21	1.35
Testers
T₁	− 8.47**	− 14.0**	− 3.86**	− 5.02**	17.32**	24.05**	6.19**	10.13**	4.85**	6.02**
T₂	− 23.07**	− 6.38**	− 9.06**	− 13.48**	11.03**	7.66**	8.02**	13.22**	10.39**	1.82**
T₃	31.54**	20.38**	12.92**	18.50**	− 28.35**	− 31.71**	− 14.21**	− 23.35**	− 15.24**	− 7.84**
LSD 0.05	2.37	1.69	1.03	1.17	2.15	2.22	2.79	2.55	1.42	1.29
0.01	2.79	2.03	1.42	1.83	2.77	3.04	3.14	3.21	1.87	1.74

Parents	Maximum root length (cm)		Number of roots/plant		Root volume		Root xylem vessel number		Osmotic adjustment
Parents	N	S	N	S	N	S	N	S	Osmotic adjustment
Lines
L₁	− 2.89**	− 1.94**	− 15.66**	− 9.56**	− 6.37**	− 4.17**	− 17.49**	− 12.58**	2.39**
L₂	− 8.13**	− 3.11**	− 10.08**	− 24.05**	− 14.05**	− 10.23**	− 8.34**	− 10.09**	15.66**
L₃	19.84**	16.83**	38.22**	52.11**	53.28**	28.64**	33.84**	34.97**	− 30.81**
L₄	− 5.67**	− 7.22**	− 7.88**	− 10.31**	− 22.70**	− 8.36**	− 2.78**	− 4.07**	3.19**
L₅	− 3.15**	− 4.56**	− 4.60**	− 8.19**	− 10.16**	− 5.88**	− 5.23**	− 8.23**	9.57**
LSD 0.05	1.13	1.26	1.23	1.49	1.51	1.44	2.18	2.11	0.23
0.01	1.62	1.89	1.73	1.83	1.73	2.02	2.31	2.53	0.46
Testers
T₁	13.86**	22.06**	3.18**	5.04**	35.34**	17.56**	19.42**	13.07**	− 6.89**
T₂	16.04**	7.18**	6.24**	11.89**	26.86**	14.08**	3.57**	6.25**	− 11.05**
T₃	− 29.90**	− 29.24**	− 9.42**	− 16.93**	− 62.20**	− 31.64**	− 22.99**	− 19.32**	17.94**
LSD 0.05	1.02	0.93	1.78	1.53	1.36	1.25	1.16	0.86	0.51
0.01	1.32	1.26	2.14	2.22	1.69	1.43	1.74	1.16	0.76