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Journal of Applied Horticulture. 2004: 6(2): 45-47 |
Genetical studies on yield and its components in tomato |
Viveka Katoch; Vidyasagar |
Department of Vegetable Science, H.P. Agricultural University, Palampur - 176 062, India. |
An experiment was conducted to understand the nature of gene effects for yield and its component characters in tomato. Six generations, (P1, P2, F1, F2, B1 and B2) of Hawaii 7998 x BT-18, Hawaii 7998 x EC 191536 and BT-18 x EC 191536, derived after crossing the bacterial wilt resistant parents, were studied following 3-parameter model of Cavalli (1952) and 6-parameter model of Jink and Jones (1958). Duplicate epistasis with relatively higher magnitude of [l] interaction (+) was observed for marketable yield per plant and number of marketable fruits per plant in Hawaii 7998 x BT-18 and BT-18 x EC 191536, thus suggesting a need for exploitation of hybrid vigour or intermating followed by selection in later generations, in these crosses. Whereas, the presence of additive effects [d and i] in Hawaii 7998 x EC 191536 indicated the importance of simple pedigree selection. For the traits related to earliness (days to 50% flowering and days to first harvest), pedigree selection in BT-18 x EC 191536 and pedigree selection including hybrids in Hawaii 7998 x EC 191536 could be utilized for the presence of both additive and non-additive gene effects, respectively. | Email notification of forthcoming papers |
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