الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
This investigation was conducted at Kaha Research Farm, Qalyubia Governorate, affiliated to the Horticultural Research Institute, Agricultural Research Center, Egypt, during three seasons )from 2018 to 2021(. The study aimed to evaluate the performance of twenty exotic indeterminate genotypes of tomato (Solanum lycopersicum L.) to determine its suitability of cultivation under greenhouse conditions. The study material was obtained from two globally known gene banks namely, the Centre for Genetic Resources of the Netherlands and U.S. National Plant Germplasm System (GRIN-Global) of United States Department of Agriculture. One locally registered hybrid, Asya was used as the check. The experimental layout was complete randomized block design with three replications. The investigation consisted of two parts; the first part was to evaluate the performance of 15 exotic indeterminate genotypes of tomato. While, the second part to hybridization between the best five genotypes and obtain all possible hybrids. Data were collected for vegetative, flowering and fruit characteristics as well as the number of fruits and both early and total yields per plant. Highly significant differences were observed among the exotic genotypes and the check for all studied characteristics.
The results of part A of the study revealed that the mean check values of fruit weight, firmness and pericarp thickness were significantly high, and several of the exotic genotypes exceeded the check values for vegetative, flowering, and yield characteristics under study. The genotypes coded as G.21 (Allround), G.18 (Alicante), G.6 (Marsol), G.7 (Harzer Kind) and G.3 (Robar) are promising for their overall performance in the total yield per plant and can be recommended for further exploitation to produce hybrids.
The results of part B of the study, based on overall performance versus to the check hybrid, the hybrid H.13 showed the highest early yield. While, the hybrid H.15 gave the highest total yield per plant, so these hybrids can be further exploited. The parents P1 and P3 showed good performance in the studied yield characters, so they could be exploited to improve the yield in breeding programs. Number of clusters per plant, number of flowers and fruits per cluster, fruit set percentage, number of fruits and early yield per plant were found to have significant influence on yield per plant. Which indicate that yield could be increased by improving these traits.