Molecular mechanisms involved in convergent crop domestication

Lenser, Teresa; Theißen, Günter

doi:10.1016/j.tplants.2013.08.007

Cited by 164 publications

(154 citation statements)

References 117 publications

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“…Although domestications have occurred separately on different continents and in different cultural traditions, representing thus a set of parallel experiments from which to infer recurrent processes, plants have been subjected to similar selection pressures and developed identical or similar adaptations in different places, leading to convergent evolution [56]. Actually, Vavilov [57] had posited the Law of Homologous Variation, stating that closely related species and genera are characterized by similar homologous series in their genetic variability.…”

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

“…This observation is consistent with the concept of domestication syndrome as well as the view of convergent evolution. Lenser and Theißen [56] applied a view of "molecular convergence" to look at plant domestication. There are many examples that show that molecular convergence indeed plays an important role during domestication [58,59].…”

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

“…On the other hand, new mutations not found in natural populations, possibly detrimental to plant survival, have been identified [39]. These include transcription factors with altered spatiotemporal expression patterns, usually with minimal pleiotropic effects [56].…”

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

“…Later on, with the availability of molecular linkage maps, it became possible to conduct quantitative analyses and estimate the magnitude of the effect and position of loci (quantitative trait loci or QTLs). To date, a few hundred genes and loci have been identified by classical genetical and association mapping as targets of domestication and postdomestication divergence [4,56,68,71]. However, only a few of these have been characterized.…”

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

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The Impact of Genetic Changes during Crop Domestication

et al. 2018

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Abstract:Humans have domesticated hundreds of plant and animal species as sources of food, fiber, forage, and tools over the past 12,000 years, with manifold effects on both human society and the genetic structure of the domesticated species. The outcomes of crop domestication were shaped by selection driven by human preferences, cultivation practices, and agricultural environments, as well as other population genetic processes flowing from the ensuing reduction in effective population size. It is obvious that any selection imposes a reduction of diversity, favoring preferred genotypes, such as nonshattering seeds or increased palatability. Furthermore, agricultural practices greatly reduced effective population sizes of crops, allowing genetic drift to alter genotype frequencies. Current advances in molecular technologies, particularly of genome sequencing, provide evidence of human selection acting on numerous loci during and after crop domestication. Population-level molecular analyses also enable us to clarify the demographic histories of the domestication process itself, which, together with expanded archaeological studies, can illuminate the origins of crops. Domesticated plant species are found in 160 taxonomic families. Approximately 2500 species have undergone some degree of domestication, and 250 species are considered to be fully domesticated. The evolutionary trajectory from wild to crop species is a complex process. Archaeological records suggest that there was a period of predomestication cultivation while humans first began the deliberate planting of wild stands that had favorable traits. Later, crops likely diversified as they were grown in new areas, sometimes beyond the climatic niche of their wild relatives. However, the speed and level of human intentionality during domestication remains a topic of active discussion. These processes led to the so-called domestication syndrome, that is, a group of traits that can arise through human preferences for ease of harvest and growth advantages under human propagation. These traits included reduced dispersal ability of seeds and fruits, changes to plant structure, and changes to plant defensive characteristics and palatability. Domestication implies the action of selective sweeps on standing genetic variation, as well as new genetic variation introduced via mutation or introgression. Furthermore, genetic bottlenecks during domestication or during founding events as crops moved away from their centers of origin may have further altered gene pools. To date, a few hundred genes and loci have been identified by classical genetic and association mapping as targets of domestication and postdomestication divergence. However, only a few of these have been characterized, and for even fewer is the role of the wild-type allele in natural populations understood. After domestication, only favorable haplotypes are retained around selected genes, which creates a genetic valley with extremely low genetic diversity. These "selective sweeps" can allow mildly deleterious...

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Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

Section: Domestication Has Left Signatures Both On Morphological As Wmentioning

confidence: 99%

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The Impact of Genetic Changes during Crop Domestication

et al. 2018

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“…The process of shattering differs among crops. Therefore, different anatomical structures and mechanisms are involved in the process [54].…”

Section: Structures Involved In Shatteringmentioning

confidence: 99%

Pod Shattering: A Homologous Series of Variation Underlying Domestication and an Avenue for Crop Improvement

Ogutcen¹,

Pandey²,

Khan³

et al. 2018

Preprint

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In wild habitats, fruit dehiscence is a critical strategy for seed dispersal; however, in cultivated crops it is one of the major sources of yield loss. Therefore, indehiscence of fruits, pods, etc., was likely to be one of the first traits strongly selected in crop domestication. Even with the historical selection against dehiscence in early domesticates, it is a trait still targeted in many breeding programs, particularly in minor or underutilized crops. Here, we review of this trait in pulse (grain legume) crops, which are of growing importance as a source of protein in human and livestock diets, and which have received less attention iii) the molecular pathways underlying this important trait, iv) an overview of the extent of crop losses due to shattering, and the effects of environmental factors on shattering, and, v) efforts to reduce shattering in crops. While our focus is mainly pulse crops, we also included comparisons to crucifers and cereals because there is extensive research on shattering in these taxa.

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Diversity and Functional Dynamics of Fleshy Fruit Abscission Zones

Tranbarger

Tadeo

2020

Annual Plant Reviews Online

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We examine the current knowledge about the abscission of fleshy fruit, in particular with regards to the development and function of the abscission zone (AZ). While tomato is currently the main model species to elucidate the mechanisms of fleshy fruit abscission, most studies on tomato focus on the development and function of the pedicel AZ, which is involved in both flower and ripe fruit abscission. However, the localization of the AZ within the pedicel is not the most common location of the AZ for fleshy fruit. Fleshy fruit can have one or more AZ, which can be found in different locations within the inflorescence and fruiting structure and fulfil different functions. In fact, most of the fleshy fruit species examined thus far have more than one AZ, which can be found at the boundary between the fruit and pedicel (often referred to as the calyx AZ), within the pedicel as with tomato, at the juncture of the pedicel and peduncle or at the juncture between peduncle and shoot/branch. In addition, the different AZs may be activated or function at different stages of development, under different environmental conditions, or have a completely different purpose, such as the abscission of fruitlets or mature fruit. Together, our current knowledge about AZs suggests that while there are similarities between different AZs in different locations or from different species, not all AZs are created equal, which may be reflected in the underlying molecular mechanisms that control their development and function.

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Molecular mechanisms involved in convergent crop domestication

Cited by 164 publications

References 117 publications

The Impact of Genetic Changes during Crop Domestication

The Impact of Genetic Changes during Crop Domestication

Pod Shattering: A Homologous Series of Variation Underlying Domestication and an Avenue for Crop Improvement

Diversity and Functional Dynamics of Fleshy Fruit Abscission Zones

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