Statistical Distribution Model of Some Parameters in Second Generation Triticale (xTriticosecale Wittm.) crosses
Hristo Stoyanov
Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
Classical plant breeding has the main objective to improve the quality and some
properties of the crop plants. Because of this, the correct evaluation of the data
obtained during the selection process is very important. Statistically significant
differentiation of certain breeding groups would be possible only with an accurate
statistical analysis. As quantitative parameters in plants are encoded by multiple
genes, it is not possible to be given a standard approach for statistical processing
of the data. Triticale (xTriticosecale Wittm.) as a product of wide hybridization
is characterized with its highly complex genome. Often in hybrid populations
of the crop some instability in certain parameters is recorded, which results in a
distortion of the results and a large deviation from the normal distribution of the
data. To establish a model of statistical distribution in triticale for the parameters
date of heading and plant height 4395 plants of 10 segregating hybrid populations of second-generation crosses were studied. As the two parameters are characterized
by high stability of their expression in most cereals identical statistical distributions
for all crosses are expected. The results obtained for the parameter plant height,
exhibit that it has a high stability in all studied populations. The data are distributed
close to normal with determined skewness and kurtosis in some crosses. Highly
different distribution was observed in regard to the parameter date of heading.
Very high deviation from the normal distribution in all studied groups is clearly
observed. Regardless of the differences observed in some of the crosses, a model of
the statistical distribution for both parameters in second generation triticale crosses
is developed.
