Abstract:
The present study was conducted in order to estimate heterosis and combining ability
in intraspecific hybrids of some tomato genotypes at Sher-e-Bangla Agricultural
University, Dhaka-1207, Bangladesh, during the period of November, 2017 to March,
2018. The experiment was laid out in Randomized Complete Block Design (RCBD)
with three replications which included six tomato genotypes viz. G1
(SAU tomato 1),
G2
(SAU tomato 2), G3
(SL001), G4
(SL002), G5
(BARI Tomato 2) and G6 (SL 003).
Data was collected and analyzed for 10 characters viz. days to first flowering, days to
50% flowering, plant height at 50% flowering, number of cluster per plant, number of
fruit per cluster, number of fruits per plant, fruit length, individual fruit weight, fruit
diameter and locule number per plant. Seedlings of 31 days old were transplanted to
main field. G2 showed significant negative GCA for days to 1
st
and 50% flowering
and significant positive heterosis for number of fruits per plant. In case of hybrids, the
lowest days required for 1
st
flowering was observed in G2XG6 and 50% flowering in
G6XG5. Highest number of fruits was observed in G2XG6 and G3XG5 showed the
lowest number of fruits per plant. G2XG3, G2XG4, G2XG5 and G2XG6 showed
significant higher number of fruits per plant over better parent. In case of days to first
flowering G1XG4, G2XG4, G2XG4, G4XG2, G5XG4 and G6XG4 showed
significant negative heterosis over better parent and G2XG3, G2XG4 and G4XG2
showed significant negative heterosis over mid parent. G4XG1 and G6XG1 showed
significant positive SCA for plant height at 50% flowering. G2 showed significant
positive SCA for most of the characters both cased as female or male parent.
Description:
A thesis
submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
GENETICS AND PLANT BREEDING
