Adaptation of Cowpea (Vigna unguiculata (L.) Walp.) to Water Deficit during Vegetative and Reproductive Phases Using Physiological and Agronomic Characters

Table 1

Average physiological parameters under drought stress at vegetative phase.

	R0	R1	R0	R1	R0	R1
	Fv/Fm		RWC (%)		Chlorophyll content
Variety	0.875a	0.730b	81.62a	57.57b	46.12a	42.09b
value	2.2e − 16		6.889e − 12		0.003
V1	0.884^f	0.563^n	80.39 ^ab	53.71^e	38.40^e	50.43^c
V2	0.885^f	0.908^a	83.35 ^ab	85.37 ^ab	46.20^b	58.20^b
V3	0.778^m	0.704^i	79.36 ^ab	65.12^d	38.66^e	47.25^d
V4	0.898^e	0.734^g	81.33 ^ab	75.12^c	39.00^e	44.53^e
V5	0.876^g	0.787^e	83.50 ^ab	84.32^b	45.55^b	56.91^b
V6	0.821^k	0.717^h	79.03 ^ab	18.0200^g	39.18^e	30.80^h
V7	0.904^d	0.807^c	82.97^ab	90.14 ^ab	43.85 ^cd	56.90^b
V8	0.873 ^gh	0.685^j	79.96 ^ab	14.88^g	39.53^e	31.03^h
V9	0.862^i	0.688^j	83.61 ^ab	12.80^g	49.07^a	29.34^h
V10	0.921^b	0.669^l	76.51^b	13.46^g	38.80^e	30.58^h
V11	0.904^d	0.707^i	79.21 ^ab	55.35^e	42.98^d	47.75^d
V12	0.901 ^de	0.706^i	81.33 ^ab	87.37 ^ab	38.48^e	58.78^b
V13	0.833^j	0.663^m	85.38^a	89.42 ^ab	49.05^a	58.23^b
V14	0.794^l	0.662^m	82.83^ab	63.03^d	38.78^e	61.98^a
V15	0.929^a	0.780^f	84.44^a	61.90^d	44.73 ^bc	46.88^d
V16	0.898^e	0.791^d	81.33 ^ab	34.26^f	38.38^e	48.45^d
V17	0.886^f	0.67950^k	81.07 ^ab	66.77^d	43.55 ^cd	36.53^g
V18	0.910^c	0.684^j	81.12 ^ab	13.50^g	38.38^e	29.13^h
V19	0.870^h	0.882^b	82.23 ^ab	90.88^a	39.50^e	58.65^b
V20	0.881^f	0.788^e	83.38 ^ab	76.10^c	49.70^a	40.00^f
value	2.2e − 16	2.2e − 16	0.00676	2.2e − 16	2.2e − 16	2.2e − 16
LSD at 0.05	0.17	0.11	3.99	4.44	1.32	1.65

Means with the same letter within a column are not significantly different. V1 to V20 are the 20 varieties used in this study. R1 is the water regime at the vegetative stage.