Seed abscission and fruit dehiscence required for seed dispersal rely on similar genetic networks

Balanzà, Vicente; Roig‐Villanova, Irma; Marzo, Maurizio Di; Masiero, Simona; Colombo, Lucia

doi:10.1242/dev.135202

Cited by 55 publications

(56 citation statements)

References 64 publications

(93 reference statements)

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“…At close range (within a few meters), bean plants disperse their seeds through the explosive dehiscence of their pods. The dehiscence phenomenon lies at the intersection of genetic ( Suzuki et al 2009 ; Lenser and Theißen 2013 ; Balanzà et al 2016 ), anatomic pod structure ( Prakken 1934 ), and environment factors that promote seed dispersal in wild beans but were selected against during domestication ( Koinange et al 1996 ). This dispersal takes place in each of the gene pools and each year, and could increase the possibility of gene flow between sympatric populations growing in the same areas.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Scales of Range Expansion in Wild Phaseolus vulgaris

Ariani

Teran

Gepts

2017

Molecular Biology and Evolution

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The wild progenitor of common-bean has an exceptionally large distribution from northern Mexico to northwestern Argentina, unusual among crop wild progenitors. This research sought to document major events of range expansion that led to this distribution and associated environmental changes. Through the use of genotyping-by-sequencing (∼20,000 SNPs) and geographic information systems applied to a sample of 246 accessions of wild Phaseolus vulgaris, including 157 genotypes of the Mesoamerican, 77 of the southern Andean, and 12 of the Northern Peru–Ecuador gene pools, we identified five geographically distinct subpopulations. Three of these subpopulations belong to the Mesoamerican gene pool (Northern and Central Mexico, Oaxaca, and Southern Mexico, Central America and northern South America) and one each to the Northern Peru–Ecuador (PhI) and the southern Andean gene pools. The five subpopulations were distributed in different floristic provinces of the Neotropical seasonally dry forest and showed distinct distributions for temperature and rainfall resulting in decreased local potential evapotranspiration (PhI and southern Andes groups) compared with the two Mexican groups. Three of these subpopulations represent long-distance dispersal events from Mesoamerica into Northern Peru–Ecuador, southern Andes, and Central America and Colombia, in chronological order. Of particular note is that the dispersal to Northern Peru–Ecuador markedly predates the dispersal to the southern Andes (∼400 vs. ∼100 ky), consistent with the ancestral nature of the phaseolin seed protein and chloroplast sequences observed in the PhI group. Seed dispersal in common bean can be, therefore, described at different spatial and temporal scales, from localized, annual seed shattering to long‐distance, evolutionarily rare migration.

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Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Scales of Range Expansion in Wild Phaseolus vulgaris

Ariani

Teran

Gepts

2017

Molecular Biology and Evolution

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“…Its presence in the joint may be due to a co-option of downstream valve margin pathway genes to facilitate formation of the joint abscission zone. Similar co-option is observed in seed abscission zones, although these zones typically involve SEEDSTICK ( STK ) in lieu of SHP , and the functionally similar transcription factor HEC3 in lieu of IND (67). SHP1/2 and ALC expression are both consistent with this co-option, as they are expressed in all three regions (Fig 6).…”

Section: Discussionmentioning

confidence: 82%

“…Further, its abscising joint is anatomically reminiscent to a valve margin (36). Abscission zones are also found between septum and seeds, and they too share similar anatomy and expression to typical silique valve margins (67). Heteroarthrocarpic distal regions are unlike indehiscent non-heteroarthrocarpic siliques such as L. appelianum , because heteroarthrocarpic distal regions have no remnant valve margin in contrast to indehiscence observed in Lepidium and the proximal region of Cakile (32,36).…”

Section: Discussionmentioning

confidence: 99%

How to Build a Fruit: Transcriptomics of a Novel Fruit Type in the Brassiceae

Carey

Hall

Mendler

2018

Preprint

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20Comparative gene expression studies are invaluable for predicting how existing genetic 21 pathways may be modified or redeployed to produce novel and variable phenotypes. Fruits are 22 ecologically important organs because of their impact on plant fitness and seed dispersal, 42 siliques within the Brassicaceae, facilitating future studies on seed shattering in important 43 Brassicaceous crops and pernicious weeds.44 45 3 46 62Arabidopsis, especially amongst close relatives e.g., the loss of dehiscence in many species 63 across the Brassicaceae (1). 65Brassicaceae fruits vary markedly in shape, structure, and size (1,8). Their variation in 66 dehiscence is a focal point for research because it fundamentally changes fruit structure, 67 subsequently affecting dispersal and diversification (9). A prerequisite for exploring how 68 differences in fruit morphology are achieved across the Brassicaceae is familiarity with both the 69 fruit structure and underlying genetic pathways in Arabidopsis (10,11). Arabidopsis fruits, 102 results in indehiscent fruits in Arabidopsis: SHP1/2, SPT,. Overexpression 103 of FUL or NO TRANSMITTING TRACT (NTT) also results in indehiscent fruits (28,29); FUL 104 overexpression completely suppresses SHP1/2, resulting in reduced lignification in the enb layer 105 and reduced valve margin formation; overexpression of NTT phenocopies the ful mutation 106 resulting in valve margin specific genes being expressed throughout valve. In summary, a 107 modification of many components in this pathway results in a loss of dehiscence. Because 108 indehiscence is observed in at least 20 different lineages across the family, it is likely that this 109 phenotype evolved via multiple modifications to this pathway (30). As such, there is no singular 110 alteration to the fruit patterning pathway implicated in this shift for all tribes. 111 112 To date, little is known about the genetic basis of indehiscence in the Brassicaceae, although it is 113 currently being bridged by studies in taxa with varying indehiscent morphologies. Recently, a114 study demonstrated a deviation in expression of eight key genes between pod shatter sensitive 115 species and shatter resistant species of Brassica and Sinapis (2). In Lepidium, there has been an 116 evolutionary shift from dehiscence to indehiscence, e.g., valve margin genes that are conserved 6 117 between the dehiscent L. campestre and Arabidopsis have been lost in the indehiscent L.118 apellianum (31,32). Upregulation in upstream regulator AP2 has been suggested as a factor in 119 this indehiscence (32).120 121 A notable morphological adaptation is the evolution of a complex fruit type known as 122 heteroarthrocarpy, which is only found in some members of the tribe Brassiceae (30,33,34). This 123 modified silique is defined by the presence of a variably abscising central joint, an indehiscent 124 distal region, and a variably dehiscent proximal region (Fig 2). As such, this novel morphology 125 offers an opportunity to investigate fruit variation beyond shifts from ...

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“…Furthermore, for dehiscent fruits, like in Arabidopsis , lignification of the cell wall of specific cells has to occur so that the valves can detach when the fruit is dry and the seed can disperse ( Ballester and Ferrandiz, 2017 ). A similar process occurs in the funiculus, the tissue connecting placenta and seed, necessary for seed abscission ( Balanzà et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Exploring Cell Wall Composition and Modifications During the Development of the Gynoecium Medial Domain in Arabidopsis

Herrera-Ubaldo

Folter

2018

Front. Plant Sci.

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In Arabidopsis, the gynoecium, the inner whorl of the flower, is the female reproductive part. Many tissues important for fertilization such as the stigma, style, transmitting tract, placenta, ovules, and septum, comprising the medial domain, arise from the carpel margin meristem. During gynoecium development, septum fusion occurs and tissues form continuously to prepare for a successful pollination and fertilization. During gynoecium development, cell wall modifications take place and one of the most important is the formation of the transmitting tract, having a great impact on reproductive competence because it facilitates pollen tube growth and movement through the ovary. In this study, using a combination of classical staining methods, fluorescent dyes, and indirect immunolocalization, we analyzed cell wall composition and modifications accompanying medial domain formation during gynoecium development. We detected coordinated changes in polysaccharide distribution through time, cell wall modifications preceding the formation of the transmitting tract, mucosubstances increase during transmitting tract formation, and a decrease of mannan distribution. Furthermore, we also detected changes in lipid distribution during septum fusion. Proper cell wall composition and modifications are important for postgenital fusion of the carpel (septum fusion) and transmitting tract formation, because these tissues affect plant reproductive competence.

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Seed abscission and fruit dehiscence required for seed dispersal rely on similar genetic networks

Cited by 55 publications

References 64 publications

Spatial and Temporal Scales of Range Expansion in Wild Phaseolus vulgaris

Spatial and Temporal Scales of Range Expansion in Wild Phaseolus vulgaris

How to Build a Fruit: Transcriptomics of a Novel Fruit Type in the Brassiceae

Exploring Cell Wall Composition and Modifications During the Development of the Gynoecium Medial Domain in Arabidopsis

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