Tomato (Solanum lycopersicun L.) is one of the most vital agricultural commodity; which is being used for culinary purpose and for the production of ketchup, juice, puree, sauce etc. It is a reservoir of Vitamin A, Vitamin C and minerals including Ca, P and Fe and antioxidants (lycopene and β-carotene)1. Tomato is exclusively autogamous plant and is gaining attention of the horticulturists. Scale of heterosis and comfortability to produce hybrid seeds measure the potential of hybrid vigor.
A research was performed; which exhibited that ample information regarding magnitude of General Combining Ability (GCA) between crossed hybrid plants and Specific Combining Ability (SCA) in F1’s is essential for crop improvement2. The GCA exposed the presence of additive gene effects while SCA revealed non-additive gene effects. Copious knowledge regarding standard heterosis and SCA are constructive in selecting the best hybrids for preferred traits. Savale and team3 investigated heterosis in 8 lines×4 tester’s for tomato fruit quality traits. This research exhibited the major differences among the genotypes for all the traits. Elevated leval of heterosis was also observed in most of the hybrids characters showing the role of non-additive gene effects. This phenomenon has also by many other scientists4,5.
Mohammad I and Al-Daej conducted an experiment; to understand the gene effects influencing various fruit characteristics in tomato by Line×Tester analysis. The experimental material consisted of F1 population produced by crossing five lines of tomato viz., K10 (L1), TY197 (L2), RAM2 (L3), S. Mar (L4) and Lian (L5) with 2 testers, namely Sultan7 (T1) and Castle Rock (T2) manually. Randomized Complete Block Design (RCBD) was followed by using three replications.
The cross 1×4 exhibited best performance regarding fruit length, diameter, firmness and weight; 1×7 for number of locales; 2×4 for TSS and the lowest fruit thickness over mid-parents. The variance values of general combining ability (GCA) were higher than the specific combining ability (SCA) for all the characters apart from the fruit thickness. Although, additive and none additive components showed resemblance in fruit thickness.
Researchers observed through SCA impacts that the cross 1×4 was the paramount in fruit weight, 1×6 in firmness, 2×3 in fruit diameter and weight, 2×5 in number of locales, 2×6 in fruit thickness and 2×7 in TSS. The magnitude of additive variance was more distinct for all the seven characters under examination. This research presented the improved lines and testers for heterosis analysis for cross pollination to attain improved tomato high quality and cultivars with elevated output. This investigation can leads towards new horizons of development in agriculture.
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