Селекционна оценка по съдържание на фотосинтетични пигменти на образци пасищен райграс (Lolium perenne L.)
Анелия Кътова • Желязко Вълчинков • Анна Илиева
Институт по фуражните култури, Плевен; ул. ”Генерал Владимир Вазов” 89
Резюме
The aim is to determine the content of photosynthetic pigments (PP) of perennial ryegrass
collection and to make a selection of stable genotypes with a high content of total
pigments. During the period 2015-2017 in the Institute of Forage Crops (IFC) -Pleven, a
collection nursery was studied in non irrigated conditions on leached black soil, by block
method in 2 replications of a total of 21 numbers accessions of perennial ryegrass, with
50 individual plants each (15 varieties and 6 ecotypes, 11 tetraploid and 10 diploid, from
Bulgaria, Belgium, Romania and China). The content of photosynthetic pigments is determined
by fresh plant samples by the method of Zelenskii and Mogileva (1980) and presents
average, minimum, maximum values, standard deviations by growths (cuts) and years,
total average for the collection. According to Frances and Kannenberg (1978), a breeding
assessment was performed through the distribution of genotypes versus the average values
for photosynthetic pigments and the coefficient of variation. Photosynthetic pigments content
has been found to vary depending on plant species, genotype (variety or ecotype, ploidy
level, maturity group) and seasonal variations (growths and years) as well as growing
conditions. The highest total PP content is reported in 2016 on average 309.47 mg / 100g fresh weight (fw) and in 2017 - 284.43 mg / 100g fw. Perennial ryegrass genotypes with
a higher PP content were selected from the average annual value for the collection during
both years of study: Merlinda, Mara, Melpetra, Iljo, Bekovi rocks and China.