Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0100-204X

Foram testados 77 linhagens puras e 25 híbridos de milho do ensaio nacional 1963/64. Em várias provas na casa de vegetação e no campo, 12 linhagens e 8 híbridos revelaram-se portadores de certa resistência, quando inoculados com urediosporos de 13 raças de Puccinia sorghi. No campo foi feito também a leitura do ataque por Helminthosporium turcicum. O autor discute observações que parecem sugerir haver relação da presença de fatores de resistência com o grau de homozigose e capacidade de combinação em linhagens, e com a produtividade em híbridos.

The results with 77 inbred cora lines and 25 hybrids are reported. Inhred lines were obtained from the Instituto de Pesquisas e Experimentação Agropecuárias do Centro-Sul (IPEACS). llybrids were the same as those used in the 1963-64 National Ilybrid variety trials. Several greenhouse and field inoculation tests were conducted utilizing a urediospore misture containing 13 P. sorghi races. Twelve inbred lines and 8 hybrids were found to be resistant. A severe natural infectiori in the field with Ilciminthosporium turcicssrn occurred and was evaluated. The author suggests that the presence of rust resistance factors might be related to the degree of homozygosity. and specific combination capacity in inbread Isnes and the productive capacity of the hybrids.

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