Table 1.

Key proteins and molecules involved in ovular pollen tube guidance.

Origin	Proteins/Molecules	Ref.
Ovule	AMOR (arabinogalactan polysaccharide)	[99]
Egg apparatus	ZmEA1	[100]
Synergid cells	LUREs	[101,102]
Synergid cells	MYB98	[103]
Central cells	CCG	[104]
Central cells	CBP1	[105]
Undefined	MAA3	[106]
Pollen tube	CHX21 and CHX23	[107]
	CNGC18	[108]
	MDIS1, MIK1 and MIK2	[109]
	PRK6	[110]
	ERU	[111]
	LIP1 and LIP2	[112]