Abstract
Efficiency of artificially crossing soybean germplasm was investigated using the BR-16, CD 201 and CD 206 cultivars, which are recommended for cropping in Parana state, Brazil. The BR-16 x CD 206 and CD 201 x CD 206 hybridizations were carried out at seven different day of times: 8.30 am, 10.00 am, 11.30 am, 1.00 pm, 2.30 pm, 4.00 pm and 5.30 pm under controlled conditions in a greenhouse, in the town of Cambe, northern Parana state. A randomized complete block design with six replications and treatments in split plots was used. The results indicated that the efficiency, evaluated as percentage of successful pollinations, depended exclusively on the female parent genotype. The BR-16 cultivar requires more careful handling during artificial hybridization because its percentage of successful pollination was consistently lower than that of CD 201. The data confirmed the possibility of conducting artificial hybridizations in soybean throughout the day under controlled conditions in a greenhouse, increasing the effective capacity of carrying out a large number of hybrid combinations.
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