Research Papers - School of Natural Sciences

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End date: 2009Subject: search.filters.subject.Yield

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    Breeding and selection of tomato F1 hybrids for yield and fruit quality characters
    (Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 2005) Alwis, L. M. H. R; Perera, A. L. T; Fonseka, H; Peiris, C. N
    Tomato (Lvcopersicon esculentum Miller) of the family Solanaceae is one of the most important vegetable crops grown in Sri Lanka. To understand the actual consumer requirements, especially in terms of fruit quality characters, an extensive survey was carried out. Results revealed that for home consumption, a majority preferred acidic, round to flatshaped, medium-sized fruits, red in colour for curries, salads and sandwiches. The Government of Sri Lanka has also identified the production of local vegetable hybrids as a matter of high priority. With this information, a half diallel genetic crossing design was carried out to produce 36 F, hybrids using nine local and foreign varieties at the Agricultural Biotechnology Centre, University of Peradeniya. These were evaluated in the Meewatura farm of the Faculty of Agriculture, University of Peradeniya. Yield and fruit quality characters including brix, acidity and fruit shape and colour were evaluated. General combining ability (GCA) and specific combining ability (SCA) were significant indicating the importance of both additive and dominance gene action. Out of the 36 Fi tomato genotypes; T068 was selected as the best hybrid for the tourist industry as it showed heterobeltiosis for yield (48%) and low acidity, while T025 was selected as the best hybrid for local consumption as it too showed heterobeltiosis for yield (76%) with high acidity. Both hybrids showed that yield potentials were much higher than the currently used varieties.
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    PublicationOpen Access
    Yield and quality of tomato as affected by rainfall during different growth stages
    (Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 1997) Weerakkody, W. A. P; Peiris, C. N; Jayasekara, S. J. B. A
    Cultivation of tomato (Lvcopersicon esculentum) is severely affected during the peak rainy periods in Sri Lanka, which leads to a seasonality in production andfluctuation ofprices. To study the nature of rain damage and to identify the critical growth stages prone to rain damage, staggered planting of tomato was practiced in the Mid Country Intermediate Zone during the Maha season. The rain damage was evaluated in terms of yield components, yield andfruit quality. During the vegetative growth and early flowering, rainfall was positively correlated with yield components andfruit quality. However, rainfall received during the late flowering phase reduced the weight andfinal number of fruits. During fruit growth, rainfall was positively correlated with fruit cracking andjuice pH. A negative correlation existed with other fruit defects. Hence, positive effects cf rainfall during vegetative growth and negative effects ofrainfall during reproductive growth were evident. Late flowering andfruit ripening stages were identified as critical for yield components while fruit growth andfruit ripenug stages were identified as critical for fruit quality.