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An investigation on generation mean analysis involving six generations (P1, P2, F1, F2, B1 and B2) of
the cross RSV1098 x RSV458 in sorghum was carried out for the traits associated with drought
resistance. The joint scaling test for almost all the characters was found highly significant in all the
crosses, indicating inadequacy of additive-dominance model. The dominance (h) gene effects were
found predominant along with dominance x dominance (l) interaction effects in the inheritance of
traits viz., relative leaf water content (RWC), chlorophyll stability index (CSI), harvest index and
grain yield. The preponderance of additive (d) gene effect along with dominance x dominance (l)
gene effect was found importance in the inheritance of stomatal frequency on adaxial and abaxial
surface and length of panicle. The parent RSV1098 was found superior in contributing traits viz.,
harvest index, length of panicle and total above ground dry matter and grain yield per plant, while
parent RSV458 was found superior in contributing relative leaf water content (RWC), chlorophyll
stability index (CSI) and stomatal frequency an adaxial and abaxial surface.
Key words: drought, generation mean analysis, rabi sorghum, epistasis, additive-dominance model