DISEASES AND PESTS
A.A. Golubev and B.S. Kurlovich
Fig. 42. Thielaviopsis basicola Ferr.
Withering of plants - Corynebacterium flaccum-faciens (Hedges) Dowson
Decay of plantlets, withering of plants - Erwinia carotovora (Jones) Holland
Blackness of stems - Erwinia phytophthora (Appel) Bergey et al.
Maculation of leaflets and stems, for plantlets - decay of the stem germ - Pseudomonas lupini Beltjukowa et Koroljova
Decay of plantlets (in seed) - Pseudomonas xanthochlora (Schuster) Stapp.
Bacterial wilt of plants - Pseudomonas solanacearum (E. F.. Sm.) Bergey.
Weevils (Sitona spp.).
The analysis of resistance to diseases and pests for breeding purposes consists of the following stages:
· Immunological characterization of a gene pool applying synthetic contamination, and identification of potential resistance sources.
· Testing donor properties of resistance sources during hybridization, and identification of genetic factors determining resistance.
· Utilization of resistance donors with identified genes of race-specific vertical and horizontal resistance in breeding programs.
· Maintenance of disease and pest resistance in commercial lupin cultivars at a satisfactory level by using immunological control in the links of primary seed production and breeding enhancement.
From: email@example.comMister BK. It is possible to create lupins cultivar with resistance to an anthracnose?
Sincerelly yoursDr. M. Petrova (Russia)
30 June, 2006
Dear Dr. M. Petrova,
Your question is very interesting!It is necessary to find an initial material even with an attribute of tolerance for the beginning.
Tolerant forms are expedient for crossing among themselves for intensifying stability, accumulating in genotype valuable genes. We managed to solve the problem of stability to fusarium by similar mean (Kurlovich, B.S. 1990).
The hybrid progeny may comprise transgressive forms, i.e. the forms with an increased or decreased value of the character when crossing parents with different types of variability. Differentiation in the variability of characters in parental forms can be found by testing them under different conditions using, however, the same techniques. With the help of this method, it is possible to obtain valuable transgressive forms with regard to any characters, from chemical structure to disease resistance (Kurlovich et. al., 1995). Lupin cultivars and lines (547 accessions) were tested for Fusarium resistance under different environmental conditions of two regions in Russia (near Bryansk and St. Petersburg), and in the Ukraine (near Kiev) on plots with artificially infested soil. A large number of accessions of different lupin species were selected for their resistance manifested on a single plot with infested soil. On two other plots, they were susceptible. So, differences in disease susceptibility in the same accessions were found in contrasting environments.
Resistant forms selected in one region were crossed with accessions that showed resistance in two other regions. As a result of hybridization, two transgressive resistant forms were obtained in F4 : from the crosses cv. Frost x cv. Apendrilon (Lupinus angustifolius L.), and line G-413 x line 85 (Lupinus luteus L.). Their resistance in all three regions appeared to be higher than in their parental forms. These two transgressive forms with increased resistance to Fusarium wilt were found suitable for the breeding program on Fusarium resistance in Russia, Belarus and in the Ukraine.
I am optimist! The problem of anthracnose also will be solved in the future!
Best regars, Boguslav K.