Ripening Behavior of Wild Tomato Species

Grumet, Rebecca; Fobes, Jon F.; Herner, Robert C.

doi:10.1104/pp.68.6.1428

Cited by 28 publications

(15 citation statements)

References 17 publications

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“…Nonetheless, the fruit development and ripening program varies within tomatoes, as there is no carotenoid accumulation during ripening in S. pennellii (Grumet et al 1981, Liu et al 2015. Based on comparative analysis of the expression profiles of important ripening-related genes in tomato and pepper, it has been proposed that, in spite of high conservation of the ripening-related gene repertories, the different ripening programs in these species are achieved by distinct gene regulatory mechanisms (Kim et al 2014).…”

Section: Discussionmentioning

confidence: 98%

Identification and expression profiling of DNA methyltransferases during development and stress conditions in Solanaceae

Kumar

Chauhan

Khurana

2016

Funct Integr Genomics

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DNA methyltransferase (DMTase) enzymes contribute to plant development and stress responses by de novo establishment and subsequent maintenance of DNA methylation during replication. However, the molecular mechanism underlying this activity remains obscure, especially in crop species. Using DMTase homolog complement in six Solanaceae species, we demonstrated here that their number remained conserved in Solanum lineage, whereas it was expanded in both pepper and Nicotiana benthamiana. Non-synonymous vs synonymous (Ka/Ks) substitution ratio revealed that most of the Solanaceous DMTase homologs undergo purifying selection. The genomic sequences of tomato DMT homologs in its wild relative, Solanum pennellii, remained highly conserved in their exons and methyltransferase domains. Structure analysis further revealed highly similar folding of DMTase homologs and conservation in the residues participating in protein-protein interaction in Solanum lineage, whereas a considerable diversification was observed of pepper homologs. Transcript profiling of DMTases highlighted both similar and distinct expression patterns of tomato homologs in other species during fruit development and stress responses. Overall, our analysis provides a strong basis for in-depth exploration of both conserved as well as distinct functions of tomato DMTase homologs in other economically important Solanaceae species.

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Section: Discussionmentioning

confidence: 98%

Identification and expression profiling of DNA methyltransferases during development and stress conditions in Solanaceae

Kumar

Chauhan

Khurana

2016

Funct Integr Genomics

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“…In tomato, variability in timing of abscission relative to climacteric ethylene production has been recognized among species (Grumet et al 1981). Although the genetic basis of natural variation of this response in tomato has not been extensively studied, it is known that ethylene-independent fruit retention in tomato can be indirectly conferred by loss of function of JOINT-LESS, a gene required for development of the abscission zone (Butler 1936).…”

Section: Introductionmentioning

confidence: 99%

Natural variation in fruit abscission-related traits in apple (Malus)

et al. 2008

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Abscission or retention of ripening fruit is a major component of seed dispersal strategies and also has important implications for horticultural production. Abscission-related traits have generally not been targeted in breeding eVorts, and their genetic bases remain mostly unknown. We evaluated 144 Malus accessions representing wild species, domestic cultivars, and hybrids for abscission-related traits. We found that seasonal timing of fruit abscission in wild species and hybrids showed a broad distribution similar to that seen for domestic cultivars, and that internal ethylene concentration at the time of abscission varied by over three orders of magnitude. Wild species, domestic cultivars, and hybrids all included representatives that showed abscission of fruit prior to substantial production of ethylene, as well as accessions that retained fruit for a signiWcant period of time following ethylene production. For all accessions that retained fruit, fruit removal resulted in abscission of the pedicel, and exogenous ethylene promoted abscission, suggesting that the abscission zone was functional. Our results suggest important roles for mechanisms independent of fruit ethylene production in abscission.

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“…the breaker stage) at around 45 and 56 DAA in M82 and MM, respectively; and IV, fruit ripening, between 49 to 70 DAA and 63 to 70 DAA for M82 and MM, respectively. Fruits of the wild relative S. pennellii ripen between 70 and 80 d after pollination, on or off the vine (Grumet et al, 1981). Ripening is characterized by fruit softening, which can lead to split opening of the fruits upon slight pressure.…”

Section: Optimization Of Sample Handling and Enzyme Assaysmentioning

confidence: 99%

Enzyme Activity Profiles during Fruit Development in Tomato Cultivars andSolanum pennellii

Steinhauser

Koehl

et al. 2010

Plant Physiology

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Enzymes interact to generate metabolic networks. The activities of more than 22 enzymes from central metabolism were profiled during the development of fruit of the modern tomato cultivar Solanum lycopersicum 'M82' and its wild relative Solanum pennellii (LA0716). In S. pennellii, the mature fruit remains green and contains lower sugar and higher organic acid levels. These genotypes are the parents of a widely used near introgression line population. Enzymes were also profiled in a second cultivar, S. lycopersicum 'Moneymaker', for which data sets for the developmental changes of metabolites and transcripts are available. Whereas most enzyme activities declined during fruit development in the modern S. lycopersicum cultivars, they remained high or even increased in S. pennellii, especially enzymes required for organic acid synthesis. The enzyme profiles were sufficiently characteristic to allow stages of development and cultivars and the wild species to be distinguished by principal component analysis and clustering. Many enzymes showed coordinated changes during fruit development of a given genotype. Comparison of the correlation matrices revealed a large overlap between the two modern cultivars and considerable overlap with S. pennellii, indicating that despite the very different development responses, some basic modules are retained. Comparison of enzyme activity, metabolite profiles, and transcript profiles in S. lycopersicum 'Moneymaker' revealed remarkably little connectivity between the developmental changes of transcripts and enzymes and even less between enzymes and metabolites. We discuss the concept that the metabolite profile is an emergent property that is generated by complex network interactions.

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Ripening Behavior of Wild Tomato Species

Cited by 28 publications

References 17 publications

Identification and expression profiling of DNA methyltransferases during development and stress conditions in Solanaceae

Identification and expression profiling of DNA methyltransferases during development and stress conditions in Solanaceae

Natural variation in fruit abscission-related traits in apple (Malus)

Enzyme Activity Profiles during Fruit Development in Tomato Cultivars andSolanum pennellii

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