Functional genomics of plant evolution

Transcription

Functional Genomics of Plant Evolution
How EVE lead the
flowering plants to
dominate the
world
John Roddam Spencer Stanhope
(20 January 1829 — 2 August 1908)
Matias Kirst
School of Forest Resources and Conservation
Genetics Institute
University of Florida
Modified from Cronk, Q.C. 2001 Nat Rev Genet. 2:607-19.
0
Latitude
Temperature
Gymnosperms Angiosperms
(Conifers)
(Flowering plants)
EVE
Enlarged vessel elements
Discovery
Function
Evolutionary role
Origin
(1829-1908)
Discovery
Brianna Miles, MSc
Discovery
Populus
deltoides
Populus
trichocarpa
x
x
P. deltoides
1
2
3
F1 Hybrid
4
5
…..
Discovery
Novaes et al. New Phytologist (2009) 182:878-890
Miles B. (2007) MSc thesis
Tuskan et al. Science (2006) 313:1596-604.
Quesada et al. New Phytologist (2008) 180:408-420
Drost et al. Proceeding of the National Academy of Sciences of the USA (2010) 107:8492-8497
Discovery
Vessel properties/hydraulic conductivity
Vessel area
Vessel number
Vessel element diameter
Hydraulic conductivity
r p
Kh =
8h
4
Discovery
~ 800 genes in the QTL interval
Discovery
53 expressed primarily in xylem
Discovery
4 with gene expression QTL
Discovery
4 with gene expression QTL
1 gene was a DUF
Function
Downregulation: RNAi (LETHAL)
Overexpression: 35S promoter fusion
Cintia Ribeiro, PhD candidate
Function
Downregulation: RNAi (LETHAL)
Overexpression: 35S promoter fusion
Function
Wildtype
Line 3.1
Function
Vessel Count/Sapwood area
(mm2)
Vessel area (mm2)
/Sapwood area (mm2)
0,25
200
0,2
150
0,15
100
0,1
0,05
50
0
0
Line 3.1 - OE
Wildtype
Line 3.1 - OE
Vessel Mean Diameter
(mm)
Wildtype
Hydraulic conductivity
r 4p
Kh =
8h
0,05
0,04
0,03
0,02
0,01
0
Line 3.1 - OE
Wildtype
Function
Wildtype
Maceration with Acetic Acid and Hydrogen Peroxide
Line 3.1
Vessel Height (mm)
Function
Line
3.1
Wild
type
Function
Ks Max (kg s−1MPa−1 m−1)
Hydraulic Conductivity
10
9
8
7
6
5
4
3.1
7.4
8.3
8.4
9.1
WT
Function
DUF
Domain of unknown
function
EVE
Enlarged vessel elements
(1829-1908)
Evolutionary role
0 2-4
8-30
Evolutionary role
Does EVE provide a fitness advantage?
No difference in height growth, or photosynthesis.
12
Mol m-2 s-1
10
3.1
7.4
8.3
9.1
WT
8
6
4
2
0
6am
10am
2pm
6pm
10pm
Evolutionary role
5 month-old
25 cm
Wild
type
Line
8.4
Line
9.3
Line
3.1
Evolutionary role
In hot and wet climate (a.k.a. the Cretaceous)!
16
14
Height (cm.)
12
3.1
7.4
8.3
9.1
WT
10
8
6
4
2
0
0
3
6
Days
9
Evolutionary role
In hot and wet climate (a.k.a. the Cretaceous)!
5
Mol m-2 s-1
4
3.1
7.4
8.3
9.1
WT
3
2
1
0
6am
10am
2PM
6pm
10pm
Photosynthesis
Evolutionary role
Evaporative demand is too high to sustain growth
due to limited hydraulic conductivity – stomata
closes and photosynthesis stops
Photosynthesis
Evolutionary role
Evaporative demand is supported by the larger
vessels and higher hydraulic conductivity – stomata
remains open and photosynthesis continues
Origin
Who created EVE?
0 2-4
8-30
Origin
Who created EVE?
Genomes
Transcriptomes (1 KP Project)
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
?
?
?
YES
YES
YES
Origin
Who created EVE?
DOI: 10.1111/j.1444-2906.2008.01580.x
Origin
Origin
Phycodnaviruses create genomic novelty
• Phycodnaviruses are among the organisms with the highest mutation rate
• In three sequenced genomes, out of 1000 unique ORFs, only 14 in common
• Estimates are that over 1019 new phycodnaviruses are created each day
Drake JW. Ann N Y Acad Sci. 1999 May 18;870:100-7.
Phycodnaviruses are ~ 1B years older
than green algae
EVE’s architecture is more complex in
viruses than it is in algae, and all land
plants
Drake JW. Ann N Y Acad Sci. 1999 May 18;870:100-7.
What does EVE do?
What would happen if we overexpress
EVE in a gymnosperm?
Was EVE key to the colonization of
land?
Summary
Acknowledgements
University of Florida, Forest Genomics
Laboratory
U British Columbia
Juan J. Acosta
Chris Dervinis
Annette Fahrenkrog
Leandro G. Neves
Márcio Resende
Cintia L. Ribeiro
U of Alberta
Alumni: Ryan Brown, Derek Drost, Patricio
Munoz, Tania Quesada, Evandro Novaes, Carolina
D. B. Novaes, Cynthia Silva
Shawn Mansfield
Onekp Project

Functional genomics of plant evolution

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