The isonucleus inbred lines study has been initiated from the demand of clarifying if the cytoplasm source has a positive or negative influence on the corn cars, plants, grain traits and some maize cultural features (RACZ et al, 2011a). Studies conducted on different male cytoplasm sterile inbred lines have highlighted differences between the various cytoplasm sources inbred lines and also differences in regarding the obtained single crosses behavior (GRACEN and collab., 1979; HAŞ and collab., 1999).From the maize traits, the following have been studied: plant height (cm), main ear insertion height (cm), number of branches/tassel, number of leaves/plant, main ear leaf length and width and the main ear leaf surface. This last trait has been studied because it is well known the strong correlation between the main ear leaf surface and the overall foliar surface (0,78 **) (Francis, 1980). The research has been conducted in the experimental field provided by the Maize Breeding laboratory  from Agricultural Research and Development Station Turda in 2009. The cell nucleus transfer activity for 12 elite inbred lines on various cytoplasm types has begun in 1992 starting from the assumption that among cytoplasm of different origin could exist differences in the genetic value. The orthogonally split of variants has allowed the separation of cytoplasm variance from the tester’s influence and also has highlighted the „cytoplasm x tester” interaction. The cytoplasm variance has been significant for the following maize traits: main ear leaf width (for two comparative crops from the five studied), main ear leaf area (also for two analyzed crops). For one cluster of isonucleus lines there has been significant the cytoplasm variance for the number of branches/ tassel (TC 209) and leaves/ plant (D 105). The „cytoplasm x tester” interaction variance has had statistically significant figures for the following traits: main ear leaf area (TB 367 and D 105 clusters), main ear leaf width (TC 209 cluster), number of leaves/ plant (TC 243 cluster) and number of branches/ tassel (TC221cluster).

single crosses, maize, cytoplasm, plant traits

Presentation: oral