Development and comparative studies of double cross tomato hybrids (original) (raw)
Half diallel of F1 tomato hybrid and its double cross-compatibility
Biodiversitas Journal of Biological Diversity
Breeding program for improvement of tomato fruit can be done through diallelic crosses genetic combinations. Therefore, genetic evaluation is needed to meet the breeding objective. This process can be combined with crosses between F1 to produce high diversity. However, evaluating the crosses' compatibility is required to increase the effectiveness of the assembly process. This study aimed to assess the half-diallel crosses of F1 tomatoes in the field and determine the most compatible pair cross combinations in forming double and three-way F1 populations. This study was carried out in the Experimental Farm of the Faculty of Agriculture, Hasanuddin University. The field evaluation was arranged in a randomized complete block design with ten genotypes, while the compatibility evaluation was carried out using 6 F1 half diallel as the parents. The results showed that the Mawar and Chung varieties were better parents in the crossings. Furthermore, the results showed that F1 K/M (the best yield component), M/C (the best TDS and Lycopene traits), and BC/K (the genotype has good traits of yield component, TDS and Lycopene) were the best single F1 crosses that could be inherited to the F2 generation. In contrast, F1 K/M and F1
COMPERATIVE PERFORMANCE OF SELECTED TOMATO HYBRIDS AND THEIR PARENTS.pdf
An investigation was carried out at the Research Farm of Olericulture Division under Horticulture Research Centre of Bangladesh Agricultural Research Institute (BARI) for evaluation of performance in Frs generation and parents in tomato during the winter season of 200748. The hybrids and parents showed iignificant variation in their performance. Fruit weigh! fruit length and fruit diameter varied fuom 61,.62 to 163.39 6.08 to 4'33cm and 7.30 to 4.35 cm respectively. Plant height, fruits per plant varied from 83.27 to 217.2cm,10.73 to 51.07 respectively. Fruit yield per plant varied from 0.64 to 313 kg and the cross combination pr x ps performed best Considering all characteristics the cross combinations p1 x p6, pzxpz, p5 x p6 and the parent Prz performed best.
Characterization of Determinate Tomato Hybrids: Search for Better Processing Qualities
Research Article, 2013
Thirty-one determinate tomato hybrids developed by both public and private sectors in India over the years were characterized in order to select the most appropriate hybrids for processing purpose. The performance of each hybrid was evaluated using certain physical and chemical indices. Most quality indices showed significant differences between hybrids, although their values remained in the typical ranges for processing tomatoes. In our study, two pear shaped private bred hybrids (BSS-423; TH-1359) qualified all the physico-chemical characteristics required for processing. However, three round shaped public (BCTH-62 and BCTH-4) and private (Vijay Lakshmi) bred hybrids also showed great promise for requisite qualification. The promising hybrids also showed high yield potential (> 60.0 t/ha) which is the general acceptance criteria among the farmers. The correlation study indicates some significant positive relationship between polar diameter and pericarp thickness, equatorial diameter and locule number, titratable acidity and vitamin C content, and lycopene and total carotenoids content of the fruit. The data generated in this study is of equal significance for the growers as well as for the tomato processors in the long run.
Performance of single, double and three-way cross hybrids in tomato (Lycopersicon esculentum Mill
The choice of tomato hybrids becomes ever more important for increase of yield and quality. The major objective of the research was focused to evaluate the yield performance and heterosis of tomato hybrids. In this regard, ten single, five three-way and seven double cross hybrids of tomato were evaluated for ten different yield contributing characters with a check variety. The experiment was conducted using randomized complete block design with three replications at the experimental field of Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh, from November, 2013 to April, 2014. The three categories of hybrids revealed significant differences among the genotypes and exhibited high variation for the majority of characters studied. The single cross hybrids depicted stronger performance for days to 50% flowering (18.33 days after transplanting), number of fruits/plant (133.8) and yield/plant (4.03 kg). As expected, three-way cross hybrids were most uniform followed by double cross hybrids. Among the crosses, the highest significant positive heterobeltosis for number of fruits/plant and yield/plant were revealed in single cross hybrids. The highest significant positive heterobeltosis was found in double cross hybrid for shelf life. For days to 50% flowering, significant negative heterobeltosis indicating early flowering was recorded for most of the crosses except one single cross hybrid. The hybrid C 14 produced from single cross exhibited the highest performance for yield contributing characters compared to three-way, double cross hybrids and the check variety. This hybrid can be used in future for the development of tomato hybrid varieties though hybrid breeding program.
The Journal of Horticultural Science and Biotechnology, 2019
Tomato (Solanum lycopersicum L.) is facing various problems of yield such as abiotic and biotic stresses. The wild tomato species are excellent source of economical traits which resistant to various types of stress and quality characters that can be transferred into cultivated tomato through intra and interspecific hybridisation. This study describes the development of inter and intraspecific hybrid tomato plants and screens the best hybrids. The interspecific hybrid tomato plants were developed by making a cross between wild tomato species and cultivated tomato. In the morphological traits, hybrids F 1 showed intermediate values from both of their parents in fruit weight. Although wild parent male showed dominant impact in hybrids for many morphological characters such as leaf width and length, number of fruit set per truss, and fruit yield. The hybrids F 1 also showed good characters in total soluble solids, total sugar, reducing and non-reducing sugar were enriched in cultivated tomato after crossing with wild relatives. The wild tomato has play important role in increased the lycopene level in hybrids. So, the hope that this study opens the new world gene pool for tomato breeding, ultimately contributing to the adapted of climate change and increase the tolerance to abiotic and biotic stress.
Estimation of Hybrid Vigor for Flowering and Yield Cherry Tomato Hybrids
IOP Conference Series: Earth and Environmental Science, 2023
The experiment was carried out in the greenhouses of the extension farm in Diyala governorate for the seasons (2020-2021) and (2021-2022), where ten strains of cherry tomatoes imported from the Tomato Genetic Resources Center (TGRS) at the University of California Davis Institute were planted in the first season. Tomatoes were selected (5 ) pure lines (LA4451, LA4753, LA3334, LA3538 and LA4689) and their symbols (1, 2, 3, 4 and 5), respectively, and entered into a Full Diallel crossing program to produce individual hybrids, and in the second season it included an experiment to evaluate the genotypes (5 parents + 20 hybrids) according to the RCBD design and with three replications, and the results were as follows: Genotypes: There was a significant effect of genotypes, as the parent (1) outperformed in the average fruit weight, per plant yield and total yield (8.41 g, 2.72 kg and 3.40 tons), respectively. The parent (2) outperformed the contract (94.11). parent (5) was superior in the number of flowers in the inflorescence, the number of total flowers and the number of fruits per plant (82.66 inflorescences. plants, 937.00 flowers. plants, and 512.33 fruits. plants). The hybrid (1×4) was also significantly superior in the percentage of the fruit set (95.13), the average fruit weight, the yield of one plant and the total yield (13.45 g, 4.66 kg and 5.82 tons, respectively). While the hybrid (2×5) was superior in the number of total flowers (941.33 flowers). Hybrid (5×2) outperformed in the number of flowers in the inflorescence (90.00 flowers). The superiority of the hybrid (5×4) in the number of fruits (521.33 fruits). Genetic analysis: The hybrid (1×5) showed desirable and significant hybrid vigor for the characteristics of the number of flowers in the inflorescence, the number of total flowers and the number of fruits in the plant). It was also found that the hybrid (5×2) showed a significant hybrid strength for the two traits (one plant yield and total yield). While the hybrid (2×5) and (5×1) recorded the strength of the hybrid for one trait for each of them (the percentage of the knot and the average weight of the fruit) respectively for the best parents.
Exploring the breeding potential of Mexican tomato landraces
General (GCA) and specific (SCA) combining ability are parameters that provide insight into the genetic value of lines utilized in plant breeding programs based on hybridization. The aim of this study was to estimate the GCA for yield of ten S 5 lines derived from Mexican tomato landraces and four testers S 5 derived from commercial varieties, as well as to estimate the SCA of forty hybrids obtained under the line × tester mating design. The traits evaluated were fruit yield and six of its yield components. The lines with the greater GCA effects for yield were LOR82, LOR91 and LOR111, with values of 240, 208, and 99, respectively, being higher than those obtained by most of the testers, which suggested that those native lines have important alleles. In the highest-yielding crosses participated at least one line with high positive GCA effects. In contrast, in crosses with the lowest yield, at least one parent or both exhibited negative GCA. All this results indicated that the best or worst hybrids are not necessary obtained from parents having a high or low GCA, respectively. Valuable germplasm with high yield potential was identified to be used in the generation of hybrid or open-pollinated varieties in tomato breeding programs.
Cherry tomato has the potential for improvement through heterosis breeding which can further be utilized for development of desirable recombinants. A 7×7, half-diallel mating design was used to determine heterosis over better parent, potence ratio, combining ability and gene action for nine characters in cherry tomato. Preponderance of additive gene action was evident for control of all characters studied except fruit firmness and fruit ascorbic acid content for which both additive and non-additive gene actions were evident. Generally, no particular cultivar or hybrid can be used to evaluate all studied traits with equal efficiency. However, amongst the parental lines, Solanumlycopersicum var. cerasiforme LYC 196/81 cv. Bubjekosoko (P1), PI 647522 cv. Cal Red Cherry (P3) and PI 639207 cv. Black Cherry (P7) were the best general combiners for fruit yield along with good quality traits and thus could be used in tomato hybridization programs. Also, parent Solanum sp. PI 260402 cv. M-10 (P5) exhibited highly significant general combining ability (GCA) effect in desired direction for fruit contents of TSS, titratable acidity, ascorbic acid content, and lycopene. Some crosses showing high significant specific combining ability (SCA) effects for fruit yield involved parents showing high GCA for yield. The cross P1 × P7 exhibited highest significant positive values of SCA of yield along with quality traits and this result incompatible with those obtained in a performance evaluation trail of the produced hybrids with their parents. The cross P6 (Solanum sp. PI 126915 cv. 125) × P7 exploited the best combination for better quality traits.The general performances of the F1 hybrids reflected the presence of various degrees of dominance effects; i.e., partial to overdominance for the evaluated characters. Some produced F1 hybrids had significantly heterobeltiosisin desired direction for the evaluated traits.
Horticultura Brasileira, 2016
ABSTRACT: This study carried out agronomic evaluation and estimated the combining ability of tomato lines for the industrial segment, aiming to elect promising genotypes for breeding and to find simple hybrids with superior traits. Randomized-blocks design was used with 57 treatments (45 experimental hybrids, 10 lines and 2 checks treatments) with 3 replications. A complete diallel among 10 tomato lines for processing was used. Evaluated traits were: fruit total (YT) and commercial production (YC), pulp yield (YP), fruit average mass (MM) and total soluble solids content (TSS). Diallel crosses allowed synthesizing experimental hybrids with superior traits when compared to commercial hybrids. Non-additive effects prevailed over the expression of YT, YC, YP and TSS, whereas additive effects prevailed for MM. Lines RVT-08, RVT-05 and RVT-10 are most appropriate for intrapopulational breeding. Experimental hybrids RVT-08 x RVT-09, RVT-07 x RVT-10 and RVT-08 x RVT-10 were pointed as the ...