Study of heterosis in heat tolerant tomato (Solanum lycopersicum) during summer

Abstract

An experiment was conducted at the Vegetable Research Field of Olericulture Division, Horticulture Research Cente, Bangladesh Agricultural Research Institute (BARI), Gazipur during May to October 2008 to study heterosis using eight parents viz., P1, P2, P3, P4, P5, P6, P7, and P8. Most of the combinations showed better parent heterosis for earliness. Eight crosses showed positive heterosis for flower production. The highest heterotic effect for fruit set (%) was found in the cross P6 × P7 (62.59%) followed by that in P7 × P8 (60.49%) and P1 × P7 (40.00%). For fruits per plant, 8 crosses provided more than 15 % heterosis over better parent. Considering fruit yield per plant, higher degree of heterosis was manifested by 24 hybrids over better parent ranging from 13.58 to 282.63 %. Cross combination P4 x P7 showed the maximum significant positive heterosis followed by P6 x P7 (187.84 %), P4 x P8 (166.97 %), P3 x P7 (146.08 %), P3 xP6 (103.92 %), and P1 X P7 (100.45 %) and the minimum in P4 x P6 (13.58 %). For viable pollens, P3 x P5 (20.56 %) exhibited the highest positive heterosis. In case of shelf life, the highest heterosis was observed by the cross P3 x P6 (22.78 %) followed by that in P4 x P6 (22.29 %) and P2 x P6 (14.40 %). For fruit flesh thickness, 12 hybrids exhibited more than 10 % heterosis. Pollen tubes as well as viable pollens showed positive correlation with fruit set. DOI: http://dx.doi.org/10.3329/bjar.v38i3.16980 Bangladesh J. Agril. Res. 38(3): 531-544, September 2013

Heterosis for Fruit Yield and Heat Tolerance Traits in Tomato (Lycopersicon Lycopersicum Mill.) Under Field Conditions

“…The heterobeltiosis varied from -18.15% (Tropimech × Roma Savana) to 21.30% (Rio Grande × Roma Savana). The result was in accordance with findings of Gul et al (2010), Patwary et al (2013) and Enang et al (2015).…”

“…Four hybrids exhibited significant negative heterobeltiosis. The results corroborated with findings of Patwary et al (2013), Yadav et al (2013) …”

“…Negative heterobeltiosis recorded for days to 50% flowering is desirable because of their breeding value for developing early flowering tomato hybrids which could escape heat stress. Patwary et al (2013), Enang et al (2015) and Welegama et al ISSN 2166-0379 2018 (2015) reported significant negative heterobeltiosis for days to 50% flowering.…”

“…Heterosis is the vigor manifested in hybrids and represents the superiority in performance of hybrid individuals compared to their parents. The F 1 hybrid of tomatoes is one of most leading vegetable crops all over the world (Patwary et al, 2013). Heterosis is a widely documented phenomenon in tomato with more than 50-60% of the studies on heterotic performance referring to heterosis for yield and yield components and this percent was relatively stable even throughout the last decade (Bistra and Hristo, 2007).…”

“…. Patwary et al (2013) estimated heterosis of heat tolerant tomato in an 8×8 half diallel mating. They observed significant heterosis for plant height, days to 50% flowering, number of branches per plant, number of flowers per cluster, number of fruits per cluster, number of fruits per plant, fruit length, fruit diameter, percent fruit set, fruit weight and fruit yield per plant over the better parent.…”