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

El-Mouhamady, Almoataz Bellah Ali; Gad, Abdul Aziz M.; Karim, Ghada S. A. Abdel

doi:10.1186/s42269-021-00656-1

Bulletin of the National Research Centre

Table 4 Estimates of heterosis over better parent in 15 rice hybrids for all studied traits in both experiments of normal and drought stress conditions

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

Entries	Heading date (days)		Plant height (cm)		Number of filled grains/panicle		1000-grain weight (g)		Grain yield/plant (g)
Entries	N	S	N	S	N	S	N	S	N	S
L1 x T1	− 5.11**	− 6.51**	− 1.85 NS	− 8.97**	30.01**	24.75**	22.84**	15.55**	79.16**	91.44**
L1 x T2	21.69**	33.27**	23.34**	35.81**	10.52**	6.75**	20.29**	20.30**	− 44.50**	− 54.09**
L1 x T3	17.0**	25.40**	18.07**	47.45**	36.27**	11.83**	− 10.04 NS	− 21.47**	7.71**	3.68 NS
L2 x T1	17.90**	22.91**	26.41**	44.28**	− 19.09**	− 21.08**	− 25.84**	− 52.06**	− 5.28*	− 32.62**
L2 x T2	15.96**	29.90**	22.79**	32.09**	− 18.71**	− 20.09**	− 15.82*	− 37.02**	− 12.04**	− 10.45**
L2 x T3	− 13.22**	− 13.18**	− 7.13**	− 10.07**	73.20**	63.98**	27.92**	29.91**	72.84**	37.24**
L3 x T1	22.46**	34.51**	16.03**	27.01**	− 9.31**	− 10.62**	3.77 NS	5.44 NS	4.57 NS	13.59**
L3 x T2	12.51**	24.24**	25.31**	32.05**	− 15.83**	− 23.68**	− 11.82 NS	− 39.63**	− 39.38**	− 39.35**
L3 x T3	− 4.84**	− 9.09**	− 8.23**	− 17.39**	105.49**	92.03**	34.90**	38.02**	42.30**	27.33**
L4 x T1	22.50**	36.47**	30.41**	40.82**	18.49**	16.14**	− 25.28**	− 57.91**	− 36.74**	− 55.48**
L4 x T2	3.87 *	6.85**	11.70**	14.37**	− 22.80**	− 23.12**	19.89**	20.0**	− 50.80**	− 48.01**
L4 x T3	− 12.46**	− 16.58**	− 13.18**	− 19.83**	79.27**	69.53**	39.35**	48.28**	50.27**	74.75**
L5 x T1	− 9.90**	− 13.77**	− 7.58**	− 10.51**	73.33**	75.44**	28.27**	36.41**	102.89**	112.38**
L5 x T2	11.73**	14.51**	17.57**	12.91**	− 16.72**	− 26.38**	− 4.91 NS	− 11.33*	13.93**	31.42**
L5 x T3	4.83**	15.57**	13.96**	43.61**	− 19.02**	− 21.21**	− 2.63 NS	− 20.14**	− 30.73**	− 52.62**
LSD 0.05	3.38	3.19	2.31	1.73	3.18	3.72	3.03	1.96	1.78	1.63
0.01	4.86	4.59	3.32	2.49	4.58	5.35	4.37	2.83	2.56	2.35

Crosses	Maximum root length (cm)		Number of roots/plant		Root volume		Root xylem vessel number		Osmotic adjustment
Crosses	N	S	N	S	N	S	N	S	Osmotic adjustment
L1 x T1	95.39**	98.12**	125.18**	108.91**	145.45**	140.32**	61.32**	69.17**	− 34.52*
L1 x T2	− 16.47**	− 32.16**	25.81**	15.86**	102.84**	66.12**	9.20 NS	13.56 NS	122.07**
L1 x T3	24.76**	28.73**	− 10.99**	− 8.0**	28.48**	24.26**	39.66**	54.05**	110.86**
L2 x T1	− 14.36*	− 32.78**	− 9.82**	− 19.68**	32.73**	35.21**	38.90**	52.03**	154.76**
L2 x T2	5.52 NS	− 12.28*	82.54**	79.55**	35.07**	35.39**	1.55 NS	9.14 NS	192.20**
L2 x T3	77.22**	92.76**	160.78**	172.61**	110.41**	116.41**	135.28**	137.95**	− 57.60**
L3 x T1	− 41.77**	− 56.10**	26.78**	4.18**	68.12**	65.70**	31.89**	43.15 **	125.0**
L3 x T2	− 40.77**	− 65.74**	− 35.41**	− 53.25**	43.91**	44.48**	36.06**	31.93 **	203.89**
L3 x T3	107.30**	110.21**	152.06**	117.87**	85.20**	73.92**	118.38**	126.85**	− 54.34**
L4 x T1	− 16.97**	− 21.04**	− 17.27**	− 26.88**	39.30**	29.86**	− 20.41 *	− 33.45 **	146.42**
L4 x T2	11.48*	− 19.41**	16.32**	7.27**	87.25**	89.25**	− 24.56**	− 31.17 **	137.66**
L4 x T3	37.37**	53.44**	120.04**	148.98**	114.71**	122.88**	169.68**	172.69**	− 68.47**
L5 x T1	116.97**	115.83**	247.05**	240.95**	133.15**	134.83**	92.83**	109.61**	− 27.38*
L5 x T2	− 8.34 NS	− 30.07**	− 3.66**	− 9.91**	20.29**	19.01**	13.87 NS	6.02 NS	140.25**
L5 x T3	− 49.06**	− 62.42**	− 40.28**	− 53.52**	49.21**	38.29**	8.64 NS	− 17.53 NS	118.47**
LSD 0.05	3.67	3.11	1.42	1.46	1.54	1.59	2.29	2.42	0.23
0.01	5.29	4.47	2.05	2.01	2.22	2.29	3.30	3.48	0.34

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