Fifth supplementary list of wheat varieties classified according to their genotype for hybrid necrosis and geographical distribution of Ne-genes

Abstract

An account is given about the progress in the work of the last two years . Further work is being done on the geographical distribution of both the Ne-genes .The fifth supplement consists of 144 Ne t -carriers, 208 Ne e -carriers and 326 noncarriers, together 678 varieties . The total number of varieties is 2513 being 597 Ne,-(23 .8 %), 654 Ne e -(26 .0 %) and 1262 (50 .2 %) non-carriers .

Distribution of Necrosis Genes in Wheat. Vii. Common Wheat From the Mediterranean

“…In contrast to our findings, Zeven (1971) reported the following two non-carrier regions besides the one we found in Central Asia; these include, (I). Southern GreeceMediterranean Islands -Southern Italy -Eastern and Southern Spain -North Africa -Sahara and (II) Norway -Sweden -Denmark -Poland -France -Germany -Switzerland -Austria -Hungary -Yugoslavia.…”

“…These local clean spots, called non-carrier regions by Zeven (1971), have been found in Central Asia (Pakistan, Afghanistan, Central and South Iran), and in Northern Europe (Norway, Sweden and Finland) (Tsunewaki and Nakai 1967a;Tsunewaki and Honi 1967). The current results suggest the presence of a third noncarrier region in the Balkan Peninsula.…”

Genetics of resistance to Puccinia graminis tritici and Puccinia recondita tritici in Kenya Plume wheat

“…reported that wheats possessing Lrl3 always carried the hybrid necrosis allele, Ne2m, and that crosses involving such wheats and Line E usually, but not always, segregated in F2 for hybrid necrosis. Because the F1 of the Line E crosses did not show symptoms of hybrid necrosis, the majority Line E genotype was postulated to be Nelw which is common in cultivars of Australian origin(ZEVEN, 1971). However, some plants of Line E were found to be nelnel.…”

A gene for hybrid necrosis in an inbred line of rye (Secale cereale L.)

“…assigned live alleles to the Ne, locus. Two cultivars involved in the pedigree of Tobari 66 carry the allele Nelm, Lerma Rojo (ZEVEN, 1971) and Frontana ). However, it has been well documented that the degree of necrosis can be affected by environment ZEVEN, 1976).…”