International Journal of Horticulture 2015, Vol.5, No.17, 1
-
7
1
Research Report Open Access
Heterrosis and General Combining Ability Study on Heat Tolerant Tomato
(Lycopersicon esculentum
Mill
)
Enang E.M., Kadams A.M., Simon S.Y., Louis S.J.
Department of Crop Production and Horticulture School of Agriculture and Agricultural Technology, Modibbo Adama University of Technology PMB 2076, Yola,
Nigeria.
Corresponding author email
International Journal of Horticulture, 2015, Vol.5, No.17 doi: 10.5376/ijh.2015.05.0017
Received: 01 Sep., 2015
Accepted: 12 Oct., 2015
Published: 24 Nov., 2015
Copyright
© 2015 Enang et al., This is an open access article published under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article
:
Enang E.M., Kadams A.M., Simon S.Y., ang Louis S.J., 2015, Heterrosis and General Combining Ability Study on Heat Tolerant Tomato (
Lycopersicon
esculentum
Mill) International Journal of Horticulture, 2015, Vol.5, No.17 1-7 (doi
Abstract
A study was carried out to estimate heterosis and general combining ability on heat tolerant tomato (
Lycopersicon
escullentum
Mill). The experiment was conducted at the Teaching and Research Farm of Department of Crop Production and
Horticulture Modibbo Adama University of Technology, Yola. (latitude 9º18′N) gene action governing inheritance of characters in
tomato (
Lycopersicon escullentum
Mill) under high temperature stress. The experiment was conducted at the Teaching and Research
Farm of Department of Crop Production and Horticulture Modibbo Adama University of Technology, Yola. (latitude 9º18'N and long
12º15'E) and the Teaching and Research Farm of Adamawa State University, Mubi (latitude 10º03'N and long. 13º07'E) all in
Adamawa state of Nigeria. Fourteen entries consisting of six parents and eight crosses developed by crossing two males (testers) and
four females (lines) following line x tester design were evaluated in three replications in a Randomized Complete Block Design
(RCBD) in two locations. Ten plants where randomly sampled for recorded observation. Data were collected from the following
characters; trichome count, plant height at 60DAT, number of leaves per plant at 60DAT, number of fruits per plant, weight of fruits
per plant % damaged fruits and number of days to final harvest. Data were subjected to biometrical analysis. Result of the analysis of
variance indicated highly significant difference for all characters among entries except weight of fruits per plant. The result suggested
the presence of genetic variability among the tomato genotypes under study. Significant difference were observed in the combining
ability analysis of variance in all the agronomic characters under study except for trichome count suggesting both additive and
non-additive genetic effects were important in governing this characters under study with more preponderance of additive effects.
The cultivars, Cherry, Currant, UC28B and RomaVF were identified as the best general combiners and the best yielders in terms of
number of fruits per plant with appreciable tolerance to heat damage. N and long 12º 15′E) and the Teaching and Research Farm of
Adamawa State University, Mubi (latitude 10º 03′N and long. 13º 07′E) all in Adamawa state of Nigeria. Fourteen entries consisting
of six parents and eight crosses developed by crossing two males (testers) and four females (lines) following line x tester design were
evaluated in a Randomized Complete Block Design (RCBD) with three replications. Ten plants where randomly sampled for
recorded observation. Data were collected on Trichome count, plant height at 60DAT, number of leaves per plant at 60DAT, number
of fruits per plant, weight of fruits per plant % damaged fruits and number of days to final harvest. Data were subjected to
biometrical analysis. Result of the analysis of variance indicated highly significant difference for all characters among entries except
weight of fruits per plant. The result suggested the presence of genetic variability among the tomato genotypes under study.
Significant difference were observed in the combining ability analysis of variance in all the agronomic characters under study except
for trichome count suggesting both additive and non-additive genetic effects were important in governing this characters under
study with more preponderance of additive effects. The cultivars, Cherry, Currant, UC28B, and RomaVF were identified as the best
general combiners and the best yielders in terms of number of fruits per plant with appreciable tolerance to heat damage. However,
Currant x Roma vf and Cherry x Golden roma exhibited some level of heterosis in number of leaves, number of flower clusters,
number of fruits per plant and plant height. Cherry and Currant, though identified as having highest performance in all characters
under study are not commercially acceptable but could be utilized in breeding programs for improvement of tomatoes with required
agronomic characteristics. However, UC28B, Roma vf and Golden roma are genotypes that have shown greater performances in all
the agronomic characters which could be used for commercial cultivation. Furthermore, Currant x Roma vf and Cherry x Golden
roma are desirable segregates that can be used to develop improved tomatoes with required agronomic characteristics through
recurrent selection by backcrossing.
Keywords
Heterosis; Combining ability; Tomatoes
