Deciphering the molecular basis for photosynthetic parameters in Bambara groundnut (Vigna subterranea L. Verdc) under drought stress

Table 1 Effects of drought stress on photosynthetic parameters under drought stressed (DS) and well-watered (WW) conditions in the F₄ segregating population derived from S19-3 × DodR and their parental lines

Traits	Treatment	Mean	Min	Max	SD	Variance	Normality	F-probability			S19-3	DodR
								Treatment	Genotypes	G*E
A (μmol m⁻² s⁻¹)	DS	21.20	6.09	43.46	9.20	84.70	**	*	*	**	29.21	29.32
A (μmol m⁻² s⁻¹)	WW	24.55	7.12	50.13	11.55	133.50					29.74	32.23
E (mol m⁻² s⁻¹)	DS	5.67	1.79	11.85	10.06	4.02	0.10	**	0.16	0.27	5.85	4.02
E (mol m⁻² s⁻¹)	WW	7.14	1.42	15.06	13.64	7.32					5.48	5.60
gs (mol m⁻² s⁻¹)	DS	0.25	0.09	0.79	0.7.02	0.02	**	**	**	0.15	0.32	0.12
gs (mol m⁻² s⁻¹)	WW	0.48	0.09	0.80	7.91	0.95					0.27	0.29
Ci (μmol m⁻¹)	DS	175.40	97.15	249.70	152.50	1188.00	**	**	0.12	0.25	219.58	186.85
Ci (μmol m⁻¹)	WW	238.20	120.90	524.60	403.70	2643.00					226.98	220.40
WUE (μmol mol⁻¹)	DS	129.40	56.04	260.20	204.20	1318.00	**	**	**	**	101.99	104.59
WUE (μmol mol⁻¹)	WW	88.87	37.57	152.10	124.60	559.00					86.29	99.99
RWC (%)	DS	79.57	70.21	87.54	17.33	15.54	0.22	*	0.46	0.83	79.04	82.13
RWC (%)	WW	80.85	71.92	88.42	16.50	13.48					80.36	81.95
CCI	DS	38.05	27.73	53.25	25.52	25.23	0.96	0.09	*	*	38.57	35.19
CCI	WW	36.26	20.20	52.10	31.90	36.69					36.37	37.46
F_V/F_M	DS	0.64	0.43	0.77	0.34	0.00	**	0.43	0.08	0.11	0.64	0.62
F_V/F_M	WW	0.64	0.53	0.73	0.20	0.00					0.64	0.61

A Photosynthesis rate, gs Stomatal conductance, E Transpiration rate, Ci Intracellular CO₂, WUE Water use efficiency, RWC Relative water content, CCI Chlorophyll content index, F_V/F_M Quantum yield of PSII photochemistry. SD Standard deviation, G*E Interaction between conditions and genotypes, * = Significant at p = 0.05, ** = Significant at p = 0.01

ISSN: 1471-2229