Association between line per se and testcross performance for eight agronomic and quality traits in winter rye

Abstract

We investigated associations between line per se and testcross performance in rye and suggested that selection for per se performance is valuable for several traits in multi-stage selection programs. Genotypic correlation between line per se and testcross performance is an important quantitative-genetic parameter for optimizing hybrid breeding programs. The main goal of this survey was to study the association of line per se and testcross performance at the phenotypic level. We used experimental data from the line per se and testcross performance of two segregating winter rye populations (A, B) with each of 220 progenies tested in six environments for eight agronomic and quality traits. Genotypic variances were considerably larger for per se than for testcross performance of all investigated traits resulting in higher heritabilities of the former in most instances. Genotypic correlations (r g) between testcross and line per se performance decreased with increasing complexity of the trait as shown by the respective heritabilities. They were highest (r g ≥ 0.7) for plant height and test weight in population B, and thousand-kernel weight, falling number and starch content in both populations. A selection of these traits for line per se performance in early generations will save field plots in further testing testcross performance and increase efficiency of hybrid breeding.

Pearl Millet Inbred and Testcross Performance under Low Phosphorus in West Africa

“…We observed that testcrosses had relatively reduced genetic variance compared with inbred lines. This is in accordance with the quantitative genetic theory where the genetic coefficient of variation is expected to be about four times more in inbred lines than that of testcrosses (Miedaner et al, 2014;Smith, 1986). The reduced genetic variation is attributable to the fact that all inbred lines were crossed to one tester.…”

“…This is in accordance with the quantitative genetic theory where the genetic coefficient of variation is expected to be about four times more in inbred lines than that of testcrosses (Miedaner et al, 2014;Smith, 1986). This is in accordance with the quantitative genetic theory where the genetic coefficient of variation is expected to be about four times more in inbred lines than that of testcrosses (Miedaner et al, 2014;Smith, 1986).…”

СЕЛЕКЦИЯ ИНБРЕДНЫХ ЛИНИЙ ОЗИМОЙ РЖИ (Secale cereale L.) НА ОБЩУЮ И СПЕЦИФИЧЕСКУЮ КОМБИНАЦИОННУЮ СПОСОБНОСТЬ И ЕЕ СВЯЗЬ С СЕЛЕКЦИОННЫМИ ПРИЗНАКАМИ

“…Замечено, что по мере усложнения структуры признака генотипические корреляции (r g ) становятся слабее. Самые высокие корреляции (r g  0,7) авторы выявили для высоты растения, массы 1000 зерен, а также числа падения и содержания крахмала (24). По нашим данным (табл.…”

Winter oilseed production for biofuel in the US Corn Belt: opportunities and limitations

“…Therefore, to compensate for poor germination of aerially seeded crops, seeding rates may need to be increased, which would subsequently increase input costs. However, both camelina and pennycress have very small seeds compared to, for example, winter rye (about 0.8, 0.8, and 33 g 1000 À1 seeds, respectively), which would serve to lower aerial seeding costs on a unit-area basis (Robinson, 1987;Phippen et al, 2010;Miedaner et al, 2014).…”