Genome-wide identification of mitogen-activated protein kinase gene family in Gossypium raimondii and the function of their corresponding orthologs in tetraploid cultivated cotton

Table 1 Expression profiles of MAPK genes under different stress treatments in cotton

Gene	Group	Signalling molecules				Environmental stress factors
Gene	Group	JA (100uM)	H ₂O ₂(10 mM)	ABA (100uM)	SA (10 mM)	Salt (200 mM)	PEG6000 (20%)	4°C	37°C	Wounding
MPK10	Group B	**	**	D	D	**	D	**	**	**
MPK27	Group B	**	**	**	D	**	**	**	**	**
MPK16	Group B	**	**	*	**	**	*	**	**	**
MPK18	Group B	**	**	-	**	**	**	**	**	**
MPK12	Group B	**	**	**	**	**	D	**	**	**
MPK3	Group A	**	**	*	**	**	-	**	**	*
MPK6	Group A	**	**	**	**	**	D	**	**	**
MPK9	Group A	**	**	**	**	**	D	**	**	**
MPK13	Group A	**	**	**	**	**	D	**	**	**
MPK5	Group C	**	**	**	**	-	-	**	**	**
MPK14	Group C	**	D	D	D	**	**	**	**	D
MPK25	Group C	**	**	**	**	**	**	**	**	**
MPK23	Group C	**	**	*	**	**	**	**	**	**
MPK8	Group C	**	**	**	**	**	*	**	**	**
MPK20	Group C	**	**	**	*	**	**	**	**	**
MPK2	Group D	**	**	**	**	**	**	**	**	**
MPK7	Group D	**	**	**	**	**	**	**	*	**
MPK22	Group D	**	**	*	**	**	-	**	**	**
MPK28	Group D	**	**	**	**	**	**	**	**	**
MPK11	Group D	**	**	**	*	**	**	**	/	**
MPK19	Group D	**	*	*	D	**	D	**	**	**
MPK15	Group D	**	**	**	*	**	**	**	**	**
MPK24	Group D	**	**	**	*	**	D	**	**	**

Note: For hormone treatments, the leaves of seedlings were harvested at 0, 0.5, 1, 2, 4, 6, 8, 10, 12 and 24 h after treatment;
For the environmental stress factor treatments, the leaves of seedlings were harvested at 0, 0.25, 0.5, 1, 2, 4, 6, 8, 10, 12 and 24 h after treatment;
“**” and “*” indicate significant difference at P < 0.01 and P < 0.05, respectively;
“-” represents no change and weak upregulation; “D” represents significant reduction in MAPK gene expression after treatment;
“/” represents absent data. The Student’s t-test was performed between treated samples and untreated samples.