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Maize Pollen Longevity and Distance Isolation Requirements for Effective Pollen Control

^a Hibridos Pioneer de Mexico, S.A. de C.V., Camino Viejo A. Valle de Banderas, km. 3, #19 Tapachula Nay. Mexico
^b Hibridos Pioneer De Mexico, S.A. de C.V., Carr. Guadalajara, - Morelia km. 21 #8601, Nicolas R. Casillas - Mpio. Tlajomulco Jalisco, CP 45635 Mexico
^c Pioneer Hi-Bred International, Inc., P.O. Box 552, Johnston, IA 50131-0552
^d Pioneer Hi-Bred International, Inc., P.O. Box 1004, Johnston, IA 50131-1004

View larger version (23K): [in a new window]   Fig. 1. Loss of pollen viability as measured by the ability to produce seed. Fresh pollen collected from shedding anthers was exposed to atmospheric conditions for various times prior to its use in pollination. The average standard error for the 2-yr mean kernel number is 22. The average standard error for individual means within each year was 38 in the 1997 experiment and 23 in the 1998 experiment.

View larger version (21K): [in a new window]   Fig. 2. Changes in pollen visual appearance after being exposed to atmospheric conditions for various amounts of time in the 1998–1999 experiment. All scores were made in the field immediately prior to pollination and at a x25 magnification level. The average standard error of a mean for the yellow, collapsed, and spherical pollen scores was 11.