B73 and related inbred lines in maize breeding

Abstract

Inbred lines B73 and Mol7 or some versions thereof are the most commonly used parental pair in the development of medium late and late maize hybrids in Serbia and Montenegro. Because of the ever-increasing importance of line B73 in maize hybrid production, we chose several B73-type lines and a few unrelated lines and crossed them. Using the pedigree method, progenies were developed up to the S6 generation. The grain yield potential of test crosses with Mo 17 inbred tester, as well as ear length, number of grain rows per ear and 1,000-grain mass of lines per-se were tested. Among the new inbred lines related to B73, line 260277/2 distinguished itself by a high potential for grain yield when crossed with Mo 17. Inbred lines 260465/1, 260362/1, 260747/4, 260357/13, 260151/2 and 260156/2 had a significantly longer ear than the mean value of all progenies. Compared with progeny mean, lines 260341/7, 260317/4, 260277/2 and 260187/2 had significantly more grain rows per ear, while 260362/1, 260130/5, 260277/2, 260151/2 and 260187/2 had a significantly larger 1,000-grain mass.Inbred linije B73 i Mol7 ili njihove verzije su najvise korisceni roditeljski par za stvaranje srednjekasnih i kasnih hibrida kukuruza kod nas. Zbog stalno rastuceg znacaja linije B73 za proizvodnju hibrida kukuruza odabrali smo nekoliko linija tipa B73, kao i nekoliko ne srodnih linija i medjusobno ih ukrstili. Pedigre metodom su razvijena potomstva do S6 generacije. Linije su ispitivane na prinos zrna u test ukrstanjima sa inbred testerom linijom Mol7, kao i na: duzinu klipa, broj redova zrna na klipu i masu 1000 zrna perse. Medu novim inbred linijama srodnim liniji B73 istice se linija 260277/2 sa visokim potencijalom za prinos zrna u ukrstanju sa inbred linijom Mol7. Inbred linije 260465/1, 260362/1, 260747/4, 260357/13, 260151/2 i 260156/2 imaju znacajno duzi klip od proseka svih potomstava. Inbred linije 260341/7, 260317/4, 260277/2 i 260187/2 imaju znacajno veci broj redova od proseka svih potomstava. Inbred linije 260362/1, 260130/5, 260277/2, 260151/2 i 260187/2 imaju znacajno vecu masu 1000 zrna od proseka svih potomstava.