Using SSR markers to study the mechanism of 2n pollen formation in Populus euramericana (Dode) Guinier and P. popularis

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Table I

Expected and observed rates of 2n pollen grains.

Code of	Sporads				Expected rate of	Observed rate of	χ²

poplar	Dyad	Triad	Tetrad	Total	2n pollen %	2n pollen %
EA1	539	341	6629	7509	4.96	0.03	60.128^**
EA2	163	1818	5528	7509	7.69	0.09
EA3	689	682	6354	7725	7.14	10.08
EA4	2189	4093	1691	7973	36.17	29.41
P	308	484	7308	8100	3.15	2.35

^**

Indicated significant difference between expected frequency of 2n pollen and the observed frequency of 2n pollen from pollen sample at P <0.01.