Table 1.

Dry matter of roots (DM_root), shoots (DM_shoot), and the entire plant (DM_plant) of graft combinations of the rootstocks Cucurbita maxima × Cucurbita moschata (CC) and Lagenaria siceraria (Ls), with melon (Cucumis melo; M), watermelon (Citrullus lanatus; Wm), or self-grafted at day 60 after grafting (DAG 60).

Graft combination (Scion/Rootstock)	Abbreviation	Dry matter (g plant−1)			Biomass allocation
		DMroot	DMshoot	DMplant	DMroot : DMshoot	RMF
Cucurbita maxima × Cucurbita moschata, self-grafted	CC	0.294 ± 0.013 c	3.567 ± 0.268 a	3.861 ± 0.279 a	0.23 ± 0.02 c	0.08 ± 0.00 c
C. melo/C. maxima × C. moschata	M/CC	0.297 ± 0.017 c	2.981 ± 0.137 b	3.279 ± 0.150 b	0.26 ± 0.01 b	0.09 ± 0.00 b
C. lanatus/C. maxima × C. moschata	Wm/CC	0.296 ± 0.012 c	2.962 ± 0.067 b	3.259 ± 0.073 b	0.29 ± 0.01 b	0.09 ± 0.00 b
Lagenaria siceraria, self-grafted	Ls	0.553 ± 0.035 a	2.956 ± 0.134 b	3.509 ± 0.159 a	0.32 ± 0.01 a	0.16 ± 0.01 a
C. melo/L. siceraria	M/Ls	0.018 ± 0.007 d	1.589 ± 0.139 d	1.608 ± 0.140 d	0.07 ± 0.01 d	0.03 ± 0.00 d
C. lanatus/L. siceraria	Wm/Ls	0.393 ± 0.019 b	2.295 ± 0.097 c	2.689 ± 0.116 c	0.35 ± 0.01 a	0.15 ± 0.00 a
Scion (Sc)		<0.001	<0.001	<0.001	<0.001	<0.001
Rootstock (Rst)		0.114	<0.001	<0.001	0.109	<0.001
Sc × Rst interactions		<0.001	0.024	<0.001	<0.001	<0.001

Biomass allocation at DAG 60 is indicated by the DM_root : DM_shoot ratio and the root mass fraction (RMF). Different letters indicate significant differences within parameters (Tukey test, p < 0.05; mean ± SE); significant p-values of a two-way ANOVA are indicated in bold. See Supplementary Table S1 for data at DAG 30. Abbreviations of graft combinations used throughout the text are given.