A new mid-early maize hybrid of the Maize Research Institute in Knezha – Knezha 442 – was included in a research during 2013-2015. It showed results for the inheritance of quantitative signs, some biometric indexes and their mutability under various conditions of growing.
The aim of the research was to analyse heterosis manifestations, inbreeding depression, levels of dominance and gene effects of the indexes of the overall height of the plants, height of the ear location, number of leaves and ear leaf area, which complete the breeding evaluation of that newly created maize hybrid.
It was found that for the first two indexes there was a high manifestation of heterosis which varied under the changing growing conditions without affecting the character and direction of that manifestation. The heterosis was low, with values from 8.6 to 20.8 % for the indexes number of leaves and ear leaf area.
The overdominance was of the utmost importance for the inheritance of the studied indexes. The dominant gene effects had the biggest share in the inheritance of those biometric indexes.