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In the present study, heterobeltiosis and standard heterosis were estimated on 36 F1s obtained through half-diallel mating design for yield and quality traits. For yield per plant trait, seven out of 36 hybrids recorded standard heterosis of more than 100 per cent. CSR-30 x HUBR10-9 (160.09 per cent) recorded the highest significant positive standard heterosis over yield check Pusa Basmati-1. For quality traits, hybrid Pusa Basmati-1121 X Pusa Basmati-1509 performed well, as it exhibited a significant desirable standard heterosis for kernel length, kernel length after cooking, kernel breadth after cooking, and length/breadth ratio. Other hybrids that performed well for quality traits were Pusa Basmati-1 X Pusa Basmati-1121, Type-3 X Pusa Basmati-1121, Type-3 X Pusa Basmati-1509 and Taraori Basmati X Pusa Basmati-1121. 17 hybrids were found to have the desired intermediate range of amylose content (20-25 per cent) and 22 hybrids showed a desirable range of 4-7 for alkali spreading value, based on per se performance.

Gladiolus Sylvia x Melody exhibited early corm-sprouting (6.82 days). The hybrid Melody x Summer Sunshine (84.63 cm), followed by American Beauty x Pricella (84.12 cm) were tall. Maximum stem girth was observed in American Beauty x Summer Sunshine (35.31 mm), followed by Vedanapoli x Magic (33.71mm) and American Beauty x Melody (33.47 mm). Number of leaves per plant was higher in Melody x Magic (9.62), followed by Salvia x Magic (9.49) and Melody x Vedanapoli (9.42). The length was maximum (67.32 cm) in Melody x Summer Sunshine followed by Summer Sunshine x Pricella (67.57 cm), American Beauty x Vedanapoli (67.00 cm) and Vedanapoli x Pricella (66.06 cm). The hybrid Salvia x Melody was earliest to initiate flower bud (60.58 days) and first floret opening (69.04 days). The total duration of flowering was maximum in Vedanapoli x Magic.

Six mungbean parental lines and their fifteen F1s produced from half-diallel mating design were investigated for combining ability and heterosis in terms of a yield and its components. Results showed highly significant variations among the parents and F1s, suggesting a wide genetic variability for the studied characters. Analysis of variance indicated that genotypes mean square values, general combining ability (GCA) and specific combining ability (SCA) were highly significant (p ≤ 0.001) for all measured traits except for days to flowering, days to maturity, and pod length indicating genetic diversity of parents and both additive and non-additive gene effects in the inheritance of the measured traits. A higher effect of SCA than GCA for plant height and seeds per pod suggests the preponderance of non-additive gene effects in the expression of characters. Based on per se performance and GCA, BARI Mung-1, PS-7, and BMXK1-14004 were the best general combiners for yield per plant. In the context of SCA, hybrids BMXK1-14004 × Sonali mung, BMXK1-14004 × PS-7, BMXK1-14004 × BINA Mung-8, Sukumar × PS-7, and BARI Mung-1 × BINA Mung-8 were good specific combiners. BMXK1-14004 × Sonali mung and BMXK1-14004 × PS-7 were the best heterotic hybrids for yield and yield-contributing traits. These parents and crosses could be utilized for further use in breeding programs to improve yields in mungbean crops.

The objectives focuses on estimation of the magnitude of heterosis for seed yield and its component traits taking an example of six diverse lines (Pure and Stable) of sweet pepper (red color) which were attempted in half-diallel fashion excluding reciprocals during Kharif 2017 and evaluated with a cultivar Bombay grown in a greenhouse with natural ventilation. The analysis of variance showed significant differences among parents and crosses for all traits studied. On the basis of heterosis studies, RSPUHF-3 × RSPUHF-2 and RSPUHF-4 × RSPUHF-2 were identified highly significant cross combinations over better parent and standard check for the number of seeds per fruit, seed weight per fruit, thousand seed weight and per cent seed recovery, whereas; the crosses RSPUHF-7 × RSPUHF-1 and RSPUHF-7 × RSPUHF-4 exhibited a higher standard heterosis for seed yield per plant. This study showed a desirable heterosis over better parent and standard check for seed yield and contributing traits and can further directly be identified as a superior F1s after their validation over different seasons for growing under protected environments or may be utilized in future breeding programmes to obtain desirable segregants for the development of trait specific superior genotypes.

[EN] The identification of heterotic groups may provide an important advantage for hybrid eggplant (Solanum melongena) breeding. In this study, we evaluated the combining ability and heterotic patterns of eggplant lines in order to develop improved eggplant cultivars resistant to Fusarium oxysporum f. sp. melongenae (FOM). A set of 62 inbred lines was evaluated with 32 morphological descriptors and their relationships were analyzed through a multivariate cluster analysis. A subset of 39 inbred lines was selected and, together with 15 sister lines, they were crossed with two testers to investigate their general combining ability (GCA) and to establish heterotic groups. Twenty selected inbred lines with high GCA were intercrossed using a half-diallel mating design. Eighty-two hybrids were obtained and evaluated for yield and yield components. We found no association between morphological distance and membership to specific heterotic groups. However, heterosis for yield was found in hybrids among parents from different heterotic groups or that were included in all heterotic groups. Among the hybrids evaluated, some were found to be highly productive and resistant to FOM, being candidates for the registration of new cultivars with dramatically improved characteristics., Scientific and Technological Research Council of Turkey financially supported this study with Project No: 107G027. Mariola Plazas gratefully acknowledges financial support from Generalitat Valenciana and Fondo Social Europeo for a post-doctoral grant (APOSTD/2018/014).

Gladiolus Sylvia x Melody exhibited early corm-sprouting (6.82 days). The hybrid Melody x Summer Sunshine (84.63 cm), followed by American Beauty x Pricella (84.12 cm) were tall. Maximum stem girth was observed in American Beauty x Summer Sunshine (35.31 mm), followed by Vedanapoli x Magic (33.71mm) and American Beauty x Melody (33.47 mm). Number of leaves per plant was higher in Melody x Magic (9.62), followed by Salvia x Magic (9.49) and Melody x Vedanapoli (9.42). The length was maximum (67.32 cm) in Melody x Summer Sunshine followed by Summer Sunshine x Pricella (67.57 cm), American Beauty x Vedanapoli (67.00 cm) and Vedanapoli x Pricella (66.06 cm). The hybrid Salvia x Melody was earliest to initiate flower bud (60.58 days) and first floret opening (69.04 days). The total duration of flowering was maximum in Vedanapoli x Magic.

Utilization of stress tolerant maize is the key to sustainable production and food security, and hence studies were conducted at Dirab Research Station, Riyadh, Saudi Arabia, from 2009 to 2010 to estimate General Combining Ability (GCA), Specific Combining Ability (SCA) and their interactions with environment. Non-reciprocal diallel crossing was performed among six inbreds. The inbreds, 15 F1 hybrids and two checks were evaluated in split plot design. Regulated irrigation commenced before tasselling and stopped before grain filling stage, using Food and Agriculture Organization (FAO) evaporation pan as guide. Water was applied when pan reading was at 50, 70 and 90 in. to create E1, E2 and E3 environments respectively. Data were analyzed using method 3 of Gardner and Eberhart. Analysis of variance showed highly significant variance (P ⩽ 0.01) among almost all sources of variation. High significance GCA and SCA observed revealed the importance of both additive and non-additive genetic actions, while low GCA/SCA implied importance of dominant effects of gene. Anthesis-silking interval (ASI) was the most affected trait by water deficit indicating that selection for tolerance could be based on short ASI. Performance per se of the genotypes reveals the importance of hybrids with P1 and P6 but failed to indicate their suitability as combiners. The KSU 6–47 had highest significant GCA for grain yield under E1 and E2. KSU 3–69 had the lowest significant negative GCA for days to tasselling, while cross KSU 6–47 × KSU 3–69 with high SCA for grain yield and 1000-kernel weight under all environments suggested their usefulness for improvement.

A study was conducted for the analysis of combining ability of some yield and quality taits in a set of 10 durum wheat genotypesfollowing a diallel mating design excluding reciprocals. The analysis of variance for combining ability revealed that mean square values due to parents and hybrids were significant for the traits days to 50% heading, days to maturity, plant height, number of effective tillers per plant, length of main spike, peduncle length, number of spikelets per main spike, grain yield per main spike, grain yield per plant, test weight, biological yield per plant, harvest index, specific sedimentation volume, protein content, sedimentation value and β carotene which revealed that existence of differences among the parents and hybrids. Significance of both 2GCA and 2SCA for the characters days to 50% heading, days to maturity, length of main spike and number of spikelets per main spike suggested that importance of both additive and non-additive gene effects for the inheritance of these characters. The value of average degree of dominance was close to one for days to maturity and length of main spike which revealed complete dominance behaviour of interacting alleles for these characters. The parents GDW 1255, GW 2007-112 and GW 1 were good combiners for multiple traits viz., days to 50% heading, days to maturity, length of main spike, number of spikelets per main spike, number of grains per main spike and spike density in F1 generation. The crosses (give best crosses for grain yield) GW 2002-51 x GW 1 and GW 2007-77 x GW 1277 was good specific combiners for multiple traits along with grain yield in F1 generation and these crosses may be utilized in the development of high yielding progenies in durum wheat.