Patterns of expansion and expression divergence in the plant polygalacturonase gene family

Table 2 Expression (RT-PCR) of Arabidopsis PG genes in different clades

Set*	Gene1	Gene2	Ks ^†	t^‡	p < 0.05^‡
B1	At1g02460	At4g01890	1.0564	3.09	n
B2	At1g10640	At1g60590	1.252	-0.32	n
B3	At1g23460	At1g70500	0.8011	-0.73	n
B3	At1g23470	At1g70500	1.877	-14.70	y
B4	At2g41850	At3g57510	0.6805	-1.43	n
B5	At2g43860	At3g59850	2.1371	-3.00	n
B5	At2g43870	At3g59850	0.9534	2.13	n
B5	At2g43880	At3g59850	1.8279	1.00	n
B5	At2g43890	At3g59850	1.8308	-1.41	n
T1	At1g05650	At1g05660	0.2385	ND^§	y
T2	At1g23460	At1g23470	0.878	6.53	y
T3	At2g43860	At2g43870	1.4013	-6.53	y
T4	At2g43880	At2g43890	4.2072	2.83	n
T5	At3g07820	At3g07830	0.5342	ND^§	y
T5	At3g07820	At3g07840	0.4923	ND^§	y
T5	At3g07830	At3g07840	0.457	ND	ND
T6	At4g32370	At4g32380	2.6336	0.73	n
T7	At5g44830	At5g44840	0.1626	ND	ND

*Each set contains genes that were duplicated through either local-scale block duplication (B) or tandem duplication (T). In duplicated blocks where a PG is collinear with a cluster, the one-to-many relationships are shown. For tandem clusters, all pairwise combinations are shown. ^†Ks, synonymous substitution rate. ^‡Differences in expression patterns significant (y) or not (n) for t-test with df = 2, p < 0.05 [52]. ND, not determined since both genes do not have detectable RT-PCR product or ^§expression was documented for only one gene in the pair.

ISSN: 1474-760X