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Diallel Crosses Among Maryland Cultivars 1 of Tobacco 1
Author(s) -
Fan C. J.,
Aycock M. K.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400050021x
Subject(s) - diallel cross , hybrid , biology , inbreeding depression , cultivar , inbreeding , heterosis , hectare , horticulture , agronomy , population , ecology , agriculture , demography , sociology
Five cultivars and the diallel set of 10 F 1 hybrids of tobacco ( Nicotiana tabacum L.) were grown at 2 locations in 1967. The diallel was expanded in 1968 to include 7 cultivars and 21 F 1 hybrids. Also in 1968, F 1 and F 2 hybrids from the 5‐parent diallel were grown at one location in order to obtain estimates of inbreeding depression. For both years, a significant heterotic response was observed for four agronomic traits. On the average, the F 1 hybrids produced more yield and dollars per hectare, had a higher price ($/kg), and flowered earlier than the cultivars. A significant inbreeding depression was found with the F 2 hybrids for value ($/ha), price ($/kg), and days to flower. From the 7‐parent diallel, estimated variability for general combining ability was significant for 6 of the 10 traits studied, but specific combining ability estimates were small and nonsignificant. F 1 hybrids in the 5‐parent diallel did not vary significantly.