Evidence of global chlorophyll d.
Although analyses of chlorophyll d (Chl d)-dominated oxygenic photosystems have been conducted since their discovery 12 years ago, Chl d distribution in the environment and quantitative importance for aquatic photosynthesis remain to be investigated. We analyzed the pigment compositions of surface sediments and detected Chl d and its derivatives from diverse aquatic environments. Our data show that the viable habitat for Chl d-producing phototrophs extends across salinities of 0 to 50 practical salinity units and temperatures of 1 degrees to 40 degrees C, suggesting that Chl d production can be ubiquitously observed in aquatic environments that receive near-infrared light. The relative abundances of Chl d derivatives over that of Chl a derivatives in the studied samples are up to 4%, further suggesting that Chl d-based photosynthesis plays a quantitatively important role in the aquatic photosynthesis.
Kashiyama
Y
Y
Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan. chiro@jamstec.go.jp
Miyashita
H
H
Ohkubo
S
S
Ogawa
N O
NO
Chikaraishi
Y
Y
Takano
Y
Y
Suga
H
H
Toyofuku
T
T
Nomaki
H
H
Kitazato
H
H
Nagata
T
T
Ohkouchi
N
N
D002734:Chlorophyll / Q000032:analysis* / Q000378:metabolism*; D000458:Cyanobacteria / Q000254:growth & development / Q000378:metabolism*; D017753:Ecosystem; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D010788:Photosynthesis; D052817:Phototrophic Processes; D054712:Salinity; D012623:Seawater / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
D014867:Water; D002734:Chlorophyll; C107509:chlorophyll d