Heterosis and Combining Ability in Watermelon Hybrids

Abstract

This study was carried out to produce promising hybrids of watermelon. Five lines i.e. Line 1 = L 84; Line 2 = L 85 ; Line 3 = L 94 ; Line 4 = L 84g and Line 5 = L 63 were used as female parents and crossed with four cultivars i.e. Tester 6 = Crimson sweet , Tester 7 = Charleston Gray, Tester 8 = Sugar Baby , and Tester 9 = Giza1 as male parents (testers) using a factorial mating design ,in the summer season of 2010.Twenty hybrids and their nine parents (five lines and four testers) were evaluated at the Sakha farm of Horticulture Research Institute in the summer season of 2011 along with check variety Aswan F1 to study heterosis and combining ability. Vine length; No. of branches per plant; No of fruits per plant; average of fruit weight; total yield per plant; No. of days to maturity and total soluble solids content (TSS) were studied. Averages of heterosis values over better parent were positively significant for many studied traits. Both general and specific combining ability were highly significant for many traits. Line 5 is a good combiner for vine length with value 15.73 and Line 1 is a good combiner for No. of branches per plant with value of 0.88. Line 2 is a good combiner for No. of fruit per plant with value of 0.46. Line 3 is a good combiner for average of fruit weight and total yield per plant with values of 0.41 and1.43,respectively .. Line 2 and tester 8 were a good combiner for earliness with of values of-4 and-5.3, respectively, and Line 4 is a good combiner for TSS% with value of 1.19. The best crosses were, 5x6 for vine length with value of 39.67, 4x8 for No. of branches with value of 1.14, 3x7 for No. of fruit per plant with value of 1.1 and 2x8 for average of fruit weight, total fruit yield per plant and TSS with values 1.7, 10.07and 1.13,respectively, 2x9 for earliness with value of-9.67

EVALUATION OF NEW INBRED LINES AND THEIR HYBRIDS IN BALADY SQUASH VARIETY (Cucurbita pepo L.)

“…On the other hand, the best cross for Internode length was P 1 xP 3 (3.04 cm) which less than all parents and P 1 xP 2 for leaf area (642.22 cm 2 ). These finding agree with those obtained by El-Gendy (1999), Gabr (2003), Sadek (2003), Abdein (2005), Refai and Mohamed (2009), Moualla et al (2011), Omran et al (2012), Mohan et al (2012).…”

“…As well as, the values of crosses ranged from 15.68 (P 1 xP 3 ) to 20.16 mg/100g (P 2 xP 3 , P 3 xP 1 ) for ascorbic acid content, 4.19 (P 2 xP 3 ) to 5.95% (P 1 xP 2 ) for total soluble solids, 5.79 (P 2 xP 3 ) to 7.00 % (P 1 xP 2 ) for dry weight of fruit, 11.40 (P 1 xP 2 ) to 13.00 (P 3 xP 2 ) for fruit number per plant and 1.12 (P 1 xP 2 ) to 1.32 kg (P 3 xP 2 ) for fruit yield per plant. Many investigators, El-Gazzar (1981), El-Gendy (1999), Abd El-Hadi et al (2001), El-Lithy (2002), Gabr (2003), Sadek (2003), Abdein (2005), Refai and Mohamed (2009), Ghobary and Ibrahim (2010), Shamloul and Askar (2011), Moualla et al (2011), Feyzian et al (2009), Omran et al (2012), Jahan et al (2012) and Mohan et al (2012) found highly significant differences among squash genotypes for these traits.…”

Evaluation of New Summer Squash Hybrids (Cucurbita pepo L.) Compare with some Commercial Cultivars

“…At the same time, it could be confirmed that the most crosses for all studied yield and its component traits gave the better mean values over the commercial cultivars resulted in the hybrid vigor that caused by the maximum values for new lines comprised in these crosses in the both seasons. Many investigators, El-Gendy (1999), Abd El-Hadi et al (2001), El-Lithy (2002), Gabr (2003), Sadek (2003), Abdein (2005), Feyzian et al (2009), Refai and Mohamed (2009), Ghobary and Ibrahim (2010), Moualla et al (2011), Shamloul and Askar (2011), Jahan et al (2012), Mohan et al (2012), Omran et al (2012), El-Gazzar et al (2015), Habiba et al (2015), Nada (2015), El-Shoura and Abed (2018) and Elias et al (2020) found highly significant differences among squash genotypes for these traits.…”