Table 1.

Grouping of rice genes involved in starch synthesis in developmental grains according to their individual expression profiles and patterns

Starch synthesis process	Changes in the expression level at 9 DPA compared with 3 DPA in superior spikelets
	Group 1: up-regulated 2-fold	Group 2: down-regulated 2-fold	Group 3: within 2-fold
Sucrose transport	SUT1	SUT5	SUT2, SUT4
Sucrose to ADPG/G-6-P	SUS2, SUS3, SUS4, UGP1, AGPS2, AGPL2, AGPL3	SUS1, SPS3	CIN2, PGIa, PGIb, SPP2, SPS4
ADPG/G-6-P transport	BT1-2, GPT1	GPT2, GPT3	GPT4
ADPG/G-6-P to starch	AGPS1, GBSSI,SSI,SSIIa, BEI, BEIIb	AGPL1, GBSSII, SSIIb, SSIIIb	SSIIIa, BEIIa