ISSN:
1573-5060
Keywords:
Nicotiana tabacum
;
tobacco
;
CMV resistance
;
breeding
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Breeding tobacco resistant to CMV using Holmes' resistant line was initiated in 1966. The resistance was controlled by five genes. N from N. glutinosa, rm1 and rm2 from Ambalema and t1 and t2 from T.I. 245. The genotype of Holmes' resistant line was assumed to be NNrm1rm1rm2rm2t1t1t2t2, which showed a few-small-late (FSL) lesion reaction to TMV. This reaction facilitates the selection of CMV resistant plants in a segregating population. Hicks Broadleaf was crossed to Holmes' resistant line and backcrossed to the susceptible varieties Vam-fen-Hicks, Kutsaga 51 and T.T.4. Two resistant lines, 418 and 470, were selected and tested for their CMV resistance, yield and agronomic characters in 1976–1979. The % reduction of infection rate when compared with a check was 41.8% and 52.7% respectively. The two lines outyielded the check and had slightly higher value/kg leaf tobacco and lower % midrib. They were also taller and later maturing. Line 470 showed slight leaf-wilting in the early growth stage, which disappeared after topping. Smoking tests showed that the two lines had better scores than check T.T.5. The nicotine and tar contents in the cigarette smoke stream proved that the leaf quality was acceptable. The lines 418 and 470 were registered as T.T.6 and T.T.7.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00022745
Permalink
