Table 3.

Effect of drought stress conditions assayed on the total ascorbic acid (TAA) and total anthocyanin contents in commercial lettuce varieties and some wild relatives (Lactuca spp.) in a 2-year experiment.

			TAA				Anthocyanins
			2020/2021		2021/2022		2020/2021		2021/2022
Name	Group	Tissue	t Ratio	Prob > |t| a	t Ratio	Prob > |t| a	t Ratio	Prob > |t| a	t Ratio	Prob > |t| a
‘Dolomiti G12’	Green commercial variety	Leaf	2.388	0.075	2.900	0.044	–	–	–	–
‘Winter Crop’		Leaf	4.305	0.013	0.416	0.699	–	–	–	–
‘Lollo Rosso’	Red commercial variety	Leaf	1.354	0.247	1.331	0.254	−0.163	0.878	−0.650	0.551
‘Red Sails’		Leaf	5.023	0.007	1.912	0.129	−0.874	0.431	−1.756	0.154
‘Romired’		Leaf	−1.046 b	0.355 b	1.182 b	0.303 b	−0.770	0.484	−0.491	0.649
L. homblei	Wild crop relative	Leaf	6.173	0.004	3.591	0.023	−2.811	0.048	−7.345	0.002
L. dregeana		Leaf	6.033	0.004	6.182	0.004	−1.655	0.173	−2.625	0.059
		Stem	8.480	0.001	3.299	0.046	1.384	0.239	1.406	0.254

^aα = 0.05 used to test significant differences in TAA and total anthocyanin contents between control and deficit irrigation conditions.

^bData transformed (1/[TAA]¹⁰ in 2020/2021 and [TAA]¹⁰ in 2021/2022) to achieve normality.

-, not analysed because no anthocyanins were detected.