Nature of the inheritance of number of fertile nodes in determinant forms of vegetable pea

Abstract

For the first time the character of the inheritance of the determinant form with four productive nodes (variety Pervenets with a dwarf stem). The analysis of first-generation hybrids obtained from crosses of indeterminate forms with determinant samples (DTR-2 and DTR-4) showed that all the plants had a phenotype with the usual type of stem growth and the formation of buds in the axiles of stipules. When the DTR was crossed all the plants corresponded to the phenotype of DTR-2. In the second generation in the combination (indeterminant x DTR-2) a splitting was foynd in a ratio of 3:1; in F2 (the indeterminant x DTR-4) in the phenotype the plants were divided into four phenotypic classes, that indicates the presence of two genes; in (DTR-2 x DTR-4) the discrepancy was due to the early emission of buds and corresponded to 3:1. The inheritance of the feature number of productive nodes (CNC) in the Pervenets variety is due to two genes, one of which is not related to determination. This is confirmed by the analyzing crossing and calculation of the deviation of the correspondence of the actual splitting according to theoretically expected, using the 2 (hi-square) method. According to the obtained data, crossing was done [DTR-2 x VZR-28-11 (early budding)] resulting in a new variety with a limited type of stem growth, number of fertile nodes 4, suitable for mechanized harvesting.

Donors of valuable breeding traits of pea (Pisum sativum L.)

“…The determinancy is caused by the r genes, manifested phenotypically as the presence of 1-2 productive nodes only; two carpophores emerge from the last node. A determinant type of the stem growth ensures shorter anthesis and a good yield due to the total apical meristem transformation into the apical inflorescence (Kotlyar et al, 2019). Such cultivars can be used for post-harvest crops in areas with sufficient precipitation or with irrigation.…”