| FICK & QUALSET (1976) reported that culm length was closely correlated
with coleoptile length and seedling emergence. They suggested that the genetic
mechanism that governed culm length also influenced coleoptile length, but
the relatives effects of the genes showing dominant or epistatic effect
appear to be different. KONZAK et al. (1969) observed that short
culm length was associated with long coleoptile in a mutant of wheat variety,
thus ruling out the possibility of pleiotropy between these two traits.
SCARASCIA MUGNOZZA & PORCEDU (1973) also have indicated the possibility
of developing variety with short culm and long coleoptile. AGRAWAL et
al. (1977) screened hundred wheat varieties and found some triple dwarf
varieties with longer coleoptile and good seedling vigour. Dwarf wheat lines
having long coleoptile and peduncle were identified in the segregating progenies
(SHARMA et al. 1982). If more mutation studies could be undertaken
in this direction, there is definite possibility that we might alter the
genetic mechanism, that jointly influences the culm and coleoptile length.
References AGRAWAL, R., K.R. SHARMA, G.S. SHARMA, R.B. SINGH & R. NANDAN. 1977. Variability and association of coleoptile length and other traits in wheat. Indian J. Agric. Sci., 47: 234-236. ALLAN, R.E. & O.A. VOGEL. 1968. F2 monosomic analysis of culm length in wheat crosses involving semidwarf Norin-10, Brevor-14 and Chinese Spring Series. Crop Sci., 3: 538-540. FICK, G.N. & C.O. QUALSET. 1973. Genes for dwarfness in wheat, T. aestivum (L). Genetics, 75: 531-539. FICK, G.N. & C.O. QUALSET. 1976. Seedling emergence, coleoptile length and plant height relationship in crosses of dwarf and standard height wheats. Euphytica, 25: 679-684. GALE, M.D., C.M. LAW & A.J. WORLAND. 1975. The chromosomal location of a major dwarfing gene from Norin-10, new British Semidwarf wheat. Heredity, 35(3): 417-421. IZUMI, N., S. SAWADA & T. SASAKUM. 1981. A dominant gene of dwarfism located on chromosome 4D in Triticum aestivum cv. 'Al-bian'. Wheat Inf. Ser, 53. KONZAK, C.F., S.C. WOO & J. DICKEY. 1969. An induced dominant semidwarf plant height mutation in spring wheat. Wheat Inf. Ser., 28: 10 MORRIS, M.D., J.W. SCHMIDT & V.A. JOHNSON. 1975. Chromosomal location of dwarfing gene in 'Tom Thumb' wheat derivatives by monosomic analysis. Crop Sci., 12: 247-249. SCARASCIA-MUGNOZZA, G.T. & E. PORCEDU. 1973. Genetic studies of coleoptile length in T. durum. Proc. 4th Int. Wheat Genet. Sump., 301-308. SHARMA, G.S., R. PALIWAL & R.B. SINGH. 1982. Interrelationship between coleoptile length, seedling height, culm length, yield and their traits in wheat. Ind. J. Genet., 42(2): 172-175. SINGH, M.P., C.S. KALIA & R.P. PURI. 1985. Basic and applied mutagenic studies in wheat. J. Cytol. and Genet., 20: 131-146. |
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