the choice of an efficient breeding procedure depends to a large extent on knowledge of the genetic system controlling the character to be selected. the objective of this study was to determine genetic parameters for yield and other traits including some of the yield components under three planting densities, using analysis of generation means (p1, p2, f1, f2, bc1 and bc2) derived from crosses ...

Let \({{\mathbb {K}}}\) be an algebraically closed field of characteristic zero and {G}}}_a\) the additive group {K}}}\). We say that irreducible algebraic variety X dimension n over admits action if there is a regular {G}}}_a^n = {{\mathbb {G}}}_a \times \cdots (n times) on with open orbit. In this paper we find all projective toric hypersurfaces admitting action.

We establish basic properties of a sheaf graded algebras canonically associated to every relative affine scheme $$f:X\rightarrow S$$ endowed with an action the additive group $${\mathbb {G}}_{a,S}$$ over base or algebraic space S, which we call (relative) Rees algebra -action. In case varieties defined field characteristic zero, further {G}}_{a}$$ -action in terms its locally nilpotent derivati...

A complete diallel cross using eight flax genotypes including four Iranian breeding lines and four Canadian genotypes was carried out to estimate genetic parameters for days to flowering, days to maturity, plant height, primary branches per plant, number of capsules per plant, number of seeds per capsule, seed yield per plant, 1000-seed weight, seed yield and harvest index. Analysis of variance...

We show that an effective action of the one-dimensional torus $${\mathbb G}_m$$ on a normal affine algebraic variety X can be extended to semi-direct product G}_m\rightthreetimes {\mathbb G}_a$$ with same general orbit closures if and only there is divisor D consists -fixed points. This result applied study orbits automorphism group $${{\,\mathrm{Aut}\,}}(X)$$ X.

Abstract Determination of gene effects and combining abilities is a critical stage in maize hybrid breeding. In the present study, 20 S6 lines as female and three S6 inbred lines (K18, K19 and K1264/5-1) as tester were crossed and the resulting  test cross progenies were evaluated in a randomized complete block design with three replications in 2008. During the growing period, several agronomi...