Improvement of Guava Through Breeding

Negi, S. S.; Rajan, Shailendra

doi:10.17660/actahortic.2007.735.2

Cited by 31 publications

(18 citation statements)

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“…It is regarded as a "super fruit" due to its remarkable nutritional value and numerous health-promoting qualities (Razali et al, 2015). Moreover, guava is commercially rewarding even without much care (Negi and Rajan, 2007). Improper postharvest handling and microbial attacks account for 25-40% of the harvested guava fruit loss (Pandey et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of coupling gamma irradiation with calcium chloride and lemongrass oil in maintaining guava fruit quality and inhibiting fungal growth during cold storage

Hassanein

Salem

Zahran

2018

Folia Horticulturae

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This study was performed to explore the efficacy of combining more than one postharvest treatment in maintaining some quality attributes and reducing fungal pathogenicity in cold-stored guava fruits. The investigated postharvest treatments included the control, CaCl 2 (4%), lemongrass oil (2 dm 3 kg -1 ), gamma (γ) irradiation (0.2, 0.4 and 0.6 kGy), 0.4 kGy γ irradiation + CaCl 2 (4%), and 0.4 kGy γ irradiation + lemongrass oil (2 dm 3 kg -1 ). The studied physiochemical attributes included weight loss, decay percentage, fruit firmness, total soluble solids (TSS), titratable acidity (TA), and vitamin C content. Different fungal species were also isolated from decayed fruits and were identified as Alternaria alternata, Alternaria solani, Aspergillus niger, Botrytis cinerea, Fusarium solani and Rhizopus stolonifer. The severity of infection for the different fungi was determined, and an in vitro antifungal assay was conducted for lemongrass oil. All the investigated treatments generally reduced decay and water loss percentages, and controlled TSS, TA and vitamin C decrements that occurred during cold storage. On the other hand, higher irradiation doses generally increased fruit softness, and the 0.4 kGy γ dose did not contribute to the overall fruit quality when coupled with CaCl 2 and lemongrass oil, compared to CaCl 2 and lemongrass oil treatments alone.Ke y wor d s: cold storage, fungal growth, postharvest, Psidium guajava L.

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Section: Introductionmentioning

confidence: 99%

Efficacy of coupling gamma irradiation with calcium chloride and lemongrass oil in maintaining guava fruit quality and inhibiting fungal growth during cold storage

Hassanein

Salem

Zahran

2018

Folia Horticulturae

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“…At present, guava has a well-established market in over 60 countries due to its rustic, prolific character; high level of vitamin C; and great economic return (Negi and Rajan, 2007). The species is abundantly distributed in the tropics and subtropics that people from different countries consider it native to the region (Singh, 2007).…”

Section: Introductionmentioning

confidence: 99%

Allelic database and divergence among Psidium accessions by using microsatellite markers

Costa¹,

Santos²

2013

Genet. Mol. Res.

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ABSTRACT. This study aimed to investigate the genetic variability among guava accessions and wild Psidium species of the Embrapa Semiárido germplasm collection by using microsatellite loci to guide genetic resources and breeding programs, emphasizing crosses between guava and other Psidium species. DNA was extracted using the 2X CTAB method, and polymerase chain reaction products were analyzed on 6% denatured polyacrylamide gels stained with silver nitrate. The unweighted pair-group method using arithmetic average dendrogram generated from the distance matrix of the Jaccard coefficient for 183 alleles of 13 microsatellite loci was used for visualization of genetic similarity. The number of base pairs was estimated using inverse mobility method based on the regression of known-size products. Analysis of molecular variance was performed using total decomposition between and within guava accessions. The accessions showed similarity from 0.75 to 1.00, with the dendrogram presenting cophenetic value of 0.85. Five groups were observed: the first included guava accessions; the second, P. guineense accessions; the third, one accession of P. friedrichsthalianum; and the last 2 groups, P. cattleianum. The genetic similarity among P. SSR Psidium allelic database and accession divergence guineense and some guava accessions were above 80%, suggesting greater possibility to obtain interspecies hybrids between these 2 species. The genetic variability between the accessions was considered to be high (Φ ST = 0.238), indicating that guava genetic variability is not uniformly distributed among the 9 Brazilian states from where the accession were obtained. Obtaining a greater number of accessions by Brazilian states is recommended in order to have greater diversity among the species.

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“…Inter-specific hybridization between and has led to the development of hybrids (Negi 2007). Seedless varieties of guava have been found to be autotriploids (2n = 33); likewise, hybridization between and has also been reported (Landrum 1995).…”

Section: Methodsmentioning

confidence: 99%

“…Santos (2012) observed that pink and red guava accessions have a greater beneficial potential and should be targeted for breeding programs. Being a cross-pollinated species, substantial variability is available in guava propagated through seeds.There are a large number of cultivars in India, but only a few with commercial importance such as 'Allahabad Safeda' and L-49 (Sardar) have been identified for commercial cultivation; however, this fact does not affect the existence of a large number of breeding programs.Inter-specific hybridization between and has led to the development of hybrids (Negi 2007). Seedless varieties of guava have been found to be autotriploids (2n = 33); likewise, hybridization between and has also been reported (Landrum 1995).…”

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confidence: 99%

Studies on crossing behaviour and hybridization in guava

Singh¹,

Gill²,

Arora³

2017

JEB

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Aim: Methodology:Results: Interpretation:The commercial guava cultivars though having high yield potential, lack the traits of commerce. In other words, development of high yielding guava variety having coloured skin and flesh, with low seed content/soft seeds and better shelf life is need of an hour.The present study on hybridization was undertaken using commercial varieties like Allahabad Safeda, Shweta and the varieties with potential traits likeArka Kiran, Purple guava and Lalit.Among different crosses, the maximum fruit length (51.25 mm), fruit width (48.70 mm) and fruit weight (71.84 g) were recorded in Allahabad Safeda x Shweta. The lowest number of seeds per fruit (171), minimum seed weight per fruit (1.070 g), seed hardness (13.86 Kg cm ) and highest total soluble solids (7.45 Brix) were recorded in Allahabad Safeda x Arka Kiran, whereas, the Allahabad Safeda x Purple guava fruits had significantly higher vitamin C (180.14 mg per 100 g fruit) content.To conclude, the optimum time of crossing involving potential guava germplasm has been standardized. Sufficient number of hybrids as a result of different cross combinations have been obtained, which are likely to have potential traits. The obtained hybrid seedlings were planted in the field.The putative hybrids thus generated have shown the variability in morphological traits and indicate hybridity.November 2017 Vol. 38O n l i n e C o p y D. Singh et al. 1342 Introduction Materials and MethodsGuava fruit is commonly designated as 'apple of the tropics'. It belongs to family which comprises about 150 genera and more than 5,650 species. Floral structure (Epigynous flower, with many stamens of various sizes), selfincompatibility, and heterozygous nature limit the scope of breeding programmes of guava. Germplasm across the genera and species are being used for hybridization studies. Distant hybridization involves crosses between different species of the same genus or different genera. Santos (2012) observed that pink and red guava accessions have a greater beneficial potential and should be targeted for breeding programs. Being a cross-pollinated species, substantial variability is available in guava propagated through seeds.There are a large number of cultivars in India, but only a few with commercial importance such as 'Allahabad Safeda' and L-49 (Sardar) have been identified for commercial cultivation; however, this fact does not affect the existence of a large number of breeding programs.Inter-specific hybridization between and has led to the development of hybrids (Negi 2007). Seedless varieties of guava have been found to be autotriploids (2n = 33); likewise, hybridization between and has also been reported (Landrum 1995). Elite commercial guava cultivars, round and pyriformed, were reciprocally crossed to develop hybrids and fruits after crossing were analyzed to explore metaxenial effects on fruit quality (Usman 2013).Morphological characters of guava accessions were observed on the basis of UPOV (International Union for the Protection of New V...

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Improvement of Guava Through Breeding

Cited by 31 publications

References 0 publications

Efficacy of coupling gamma irradiation with calcium chloride and lemongrass oil in maintaining guava fruit quality and inhibiting fungal growth during cold storage

Efficacy of coupling gamma irradiation with calcium chloride and lemongrass oil in maintaining guava fruit quality and inhibiting fungal growth during cold storage

Allelic database and divergence among Psidium accessions by using microsatellite markers

Studies on crossing behaviour and hybridization in guava

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