Factors affecting soluble solids content of muskmelon (Cucumis melo L.).

Welles, G.W.H.; Buitelaar, K.

doi:10.18174/njas.v36i3.16675

Cited by 35 publications

(10 citation statements)

References 2 publications

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“…The second strategy is to extend the length of the period from the loss of AI until harvest by delaying the ripening process, either genetically or by agrotechnical means. Welles and Buitlaar (1988) presented evidence that agrotechnical treatments (i.e., low night temperature) can increase fruit sugar content, in correlation with the increase in length of the fruit development period. We have similarly shown that reducing greenhouse nighttime temperatures from 18°C to 12°C during the period beginning with the onset of the sucrose accumulation phase led to a significant delay in fruit ripening, and the ripe fruit had a parallel increase in fruit sugar content (Burger et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

The Contribution of Sucrose Metabolism Enzymes to Sucrose Accumulation in Cucumis melo

Burger¹,

Schaffer²

2007

J. Amer. Soc. Hort. Sci.

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The relationship between sugar accumulation and sucrose metabolism enzyme activities was studied among seven genotypes of Cucumis melo L., covering the broad genetic range of sucrose accumulation found in the species. The primary determinant correlated with sucrose levels was the genetic variation for developmental loss of soluble acid invertase (AI) activity. Sucrose accumulation in the developing fruit began only when AI activity declined to less than an experimentally determined threshold value, and continued until removal of the fruit from the plant. In addition, the activities of sucrose phosphate synthase (SPS), sucrose synthase (SuSy), and neutral invertase (NI) were all positively correlated with sucrose accumulation among the genotypes. The low-sucrose-accumulating genotypes were characterized by low activities of each of the three enzymes, irrespective of their invertase activities. Final sucrose content was best predicted for each genotype by the number of days the fruit remained attached to the plant while characterized by “sucrose accumulation metabolism,” which was characterized primarily by AI activity less than threshold values, together with SPS, SuSy, and NI activities higher than threshold levels.

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Section: Discussionmentioning

confidence: 99%

The Contribution of Sucrose Metabolism Enzymes to Sucrose Accumulation in Cucumis melo

Burger¹,

Schaffer²

2007

J. Amer. Soc. Hort. Sci.

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“…Sucrose was found to be positively correlated with TSS (Park et al, 2004b). Intermediate positive correlations of TSS with overall consumer preference, sweetness, fl avor, texture (Lester and Shellie, 1992), and maturation period (Welles and Buitelaar, 1988) were reported. Burger et al (2002) calculated both broad (0.39-0.81) and narrow (0.27-0.72) sense heritability estimates for sucrose in three melon populations.…”

mentioning

confidence: 82%

Identification and Confirmation of RAPD Markers and Andromonoecious Associated with Quantitative Trait Loci for Sugars in Melon

Sinclair¹,

Park²,

Lester³

et al. 2006

jashs

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Our objectives were to identify randomly amplified polymorphic DNA (RAPD) markers associated with quantitative trait loci (QTL) for sucrose, total soluble solids (TSS), and sucrose percentage of total sugars (SPTS) using bulked segregant analysis in an F2 population from the melon (Cucumis melo L.) cross of `TAM Dulce' (high sugars) × TGR1551 (low sugars) in a greenhouse experiment, and confirm the associations of RAPD markers with QTL for these sugar traits in an F2 population from the different cross of `Deltex' (high sugars) × TGR1551 in a field experiment. Continuous distributions for sucrose, TSS, and SPTS were observed in the F2 populations indicating quantitative inheritance for the traits. Significant positive correlations were found between sucrose and TSS or SPTS. Nine RAPD markers were detected to be significantly associated with QTL for sucrose in the F2 population of the `TAM Dulce' × TGR1551 cross in the greenhouse based on simple linear regression. Five unlinked markers associated with QTL were significant in a stepwise multiple regression analysis where the full model explained 39% of the total phenotypic variation for sucrose. Five and seven of the nine RAPD markers associated with QTL for sucrose were also observed to be significantly associated with QTL for TSS and SPTS, respectively, suggesting that in this cross three sugar traits are controlled by the same QTL. Five RAPD markers were confirmed in the F2 population of the `Deltex' × TGR1551 cross in the field to be consistently associated with QTL for three sugar traits. Significant associations of andromonoecious (a) with both sucrose and TSS were consistently expressed in our populations under greenhouse and field environments. These RAPD and floral markers associated with the sugar synthesis QTL identified and confirmed here could be useful in melon breeding for improving the mature fruit sweetness.

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“…Verificou-se que não houve efeito significativo da interação entre os fatores concentração de potássio e número de frutos por planta sobre o teor de sólidos solúveis médio de todos os frutos da planta (TSSF), sendo esta característica influenciada apenas pelo fator número de frutos por planta isoladamente, onde plantas com dois frutos apresentaram maior teor de sólidos solúveis (12,50 o Brix), tabela 2. Este resultado tem suporte em relatos dos pesquisadores MONTEIRO & MEXIA (1988), WELLES & BUITELAAR (1988), GUSMÃO, (2001) e VILELLA JÚNIOR (2001), os quais afirmam que o teor de sólidos solúveis do fruto é favorecido por maior relação área foliar por fruto. Plantas conduzidas com 2, 3, 4 e com fixação livre de frutos, e que na colheita tiveram 2,0; 2,5; 2,7 e 2,3 frutos por planta, apresentaram relação área foliar por fruto de aproximadamente 3735, 2988, 2717 e 3248cm 2 por planta.…”

Section: Resultsunclassified

Concentração de potássio na solução nutritiva e a qualidade e número de frutos de melão por planta em hidroponia

et al. 2004

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O experimento foi conduzido em hidroponia (NFT) no período de junho a novembro de 2001, na FCAV-UNESP em Jaboticabal-SP, situada a 21º15’ 22" Sul, 48º18’58" Oeste, e altitude de 575 metros. O híbrido Bônus n0 2 foi cultivado em blocos casualizados, em esquema de parcelas subdivididas, com seis repetições. Os elementos avaliados foram número de frutos por planta (2, 3, 4 e fixação livre) e concentração de potássio na solução nutritiva (66; 115,5; 165 e 247,5mg L-1). O experimento teve como objetivo avaliar a concentração de potássio na solução nutritiva e número de frutos por planta sobre a qualidade dos frutos do meloeiro. Concentrações maiores do que 66mg L-1 de potássio na solução nutritiva não promoveram incrementos nas características de qualidade dos frutos do meloeiro como: teor de sólidos solúveis médio de todos os frutos da planta, do segundo fruto, da acidez total titulável média de todos os frutos da planta, do primeiro fruto, do segundo fruto, do índice de maturação, da espessura da polpa e do índice de formato dos frutos. Frutos oriundos de plantas de melão com dois frutos apresentaram maior teor de sólidos solúveis e acidez total titulável, independente da concentração de potássio na solução nutritiva. O maior número de frutos por planta reduziu a espessura do mesocarpo dos frutos.

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Factors affecting soluble solids content of muskmelon (Cucumis melo L.).

Cited by 35 publications

References 2 publications

The Contribution of Sucrose Metabolism Enzymes to Sucrose Accumulation in Cucumis melo

The Contribution of Sucrose Metabolism Enzymes to Sucrose Accumulation in Cucumis melo

Identification and Confirmation of RAPD Markers and Andromonoecious Associated with Quantitative Trait Loci for Sugars in Melon

Concentração de potássio na solução nutritiva e a qualidade e número de frutos de melão por planta em hidroponia

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