Table 3.

Quantitative analysis of block-like and fibrous structures in in vitro pollen tubes of Torenia fournieri based on AFM images

Region	Treatment	Structure	Height (nm)a	Diameter (nm)a
Apex	Control	Block-like	4.4±1.4	27.3±4.0
	IAA	Block-like	9.7±4.0***	72.0±14.3***
Subapex	Control	Block-like	7.8±3.2	52.2±11.8
		Fibrous	3.4±0.9	26.7±3.2
	IAA	Block-like	3.8±0.8***	42.1±8.0***
		Fibrous	2.7±0.7**	28.1±2.9*

Values given in the table are means and standard errors of 20 samples measured. The analysis of significant variance was performed between the control group and IAA treatment according to Student's unpaired t-test.

^a* P > 0.05 indicates no difference; ** 0.01 < P < 0.05 indicates distinct difference; *** P < 0.01 indicates extreme distinct difference.