Table 3.

Relationships between leaf chlorosis and Fe or P bound in different cell wall fractions of the maize IBM population.

(A) SPAD	Cell wall-Fe	PE-Fe	HC1-Fe	HC2-Fe	CE-Fe
Fe300	-0.382∗∗	-0.270∗∗	-0.213∗∗	-0.146∗	-0.269∗
Fe10	-0.337∗∗	0.183∗	-0.406∗∗	-0.285∗∗	-0.137
SPAD	Cell wall-P	PE-P	HC1-P	HC2-P	CE-P
Fe300	-0.242∗∗	-0.335∗∗	-0.152∗	0.144	0.044
Fe10	-0.398∗∗	-0.485∗∗	0.015	-0.129	-0.104
(B) HC1-Fe	Cell wall-P	PE-P	HC1-P	HC2-P	CE-P
Fe300	0.752∗∗	0.653∗∗	0.893∗∗	0.385∗∗	-0.028
Fe10	0.302∗∗	0.400∗∗	0.024	0.126	0.096

(A) Correlation between SPAD values of youngest leaves with Fe or P concentrations in different cell wall fractions. (B) Correlation between hemicellulose 1-bound Fe with P concentrations in different cell wall fractions. 85 lines of the maize IBM population were cultivated hydroponically at two Fe levels, 300 μM Fe (Fe300) or 10 μM Fe (Fe10) before cell wall fractionation and element analysis. PE, pectin fraction; HC1, hemicellulose fraction-1; HC2, hemicellulose fraction-2; CE, cellulose fraction. PE-P, HC1-P, HC2-P, CE-P denote P bound in pectin, hemicellulose fraction-1, hemicellulose fraction-2, or cellulose, respectively. Correlations were calculated according to the Pearson product moment correlation by SigmaPlot version 11.0. ^∗ and ^∗∗ indicate significant differences at p < 0.05 and p < 0.01, respectively.