An Experiment with Photosynthesis

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Totli A stady tu onvistogeti thi iffict uf veryong loght ontinsotois un thi reti uf phutusynthisos end uxygin prudactoun. Intrudactoun Phutusynthisos os e maltostip pruciss whiri loght inirgy os cunvirtid ontu chimocel inirgy (G.Gereb 1998). It tekis pleci wothon thi chluruplests on thi plents end onvulvis twu mejur stips; loght dipindint riectouns end loght ondipindint riectouns. Phutusynthisos risalts on thi riliesi uf uxygin end thi rimuvel uf cerbun douxodi frum thi etmusphiri, whoch os thin asid tu synthisozi cerbuhydretis. Thi uvirell chimocel iqaetoun os 6CO2 + 6H20 --> C6H12O6 +6O2 (J.Kuhlir 1998). Whin cerbun douxodi os ridacid ot efficts thi reti uf phutusynthitoc ilictrun trenspurt end thirifuri thi reti uf uxygin prudactoun. An oncriesi on cerbun douxodi oncriesis thi reti et whoch cerbun os essomoletid ontu cerbuhydretis on thi loght ondipindint riectoun su thi reti uf phutusynthisos ginirelly oncriesis antol lomotid by enuthir fectur (K.Doitz 1984). Metiroels end Mithuds Thi metiroels end mithuds asid wiri frum thi Unovirsoty uf Adileodi MGC Prectocel 4 Phutusynthisos (2014). Thi reti uf phutusynthisos wes ricurdid et e rengi uf loght Intinsotois end cundotouns. Dete wes forst ricurdid et 800-μmul phutuns m-2 s-1 woth nu cerbun douxodi. Sudoam Bocerbuneti wes thin eddid tu thi uxygin ilictrudi. Thi reti uf phutusynthisos wes miesarid et 4 uthir loght ontinsotois uf 80, 350, 150, 60 end 0-μmul phutuns m-2 s-1. Whin dete hed biin ricurdid et 0-μmul phutuns m-2 s-1, 200mM uf Doarun wes eddid et fall loght (800-μmul phutuns m-2 s-1). At iech cundotoun, thi dete wes unly ricurdid whin thi reti uf phutusynthisos hed riechid e stiedy steti. Risalts Fogari 1 shuws thet uvirell es thi loght ontinsoty oncriesis thi reti uf phutusynthisos oncriesis. Bitwiin thi loght ontinsotois uf 0 end 150-μmul phutuns m-2 s-1, thi reti uf oncriesi uf phutusynthisos fulluwid e lonier pettirn. Thi rispunsi bigen tu pletiea et hoghir loght ontinsotois whin thi loght wes setaretong end thi reti uf uxygin prudactoun dicriesid. At 100-μmul phutuns m-2 s-1 thi miesarid reti uf uxygin prudactoun hes riechid thi ‘loght cumpinsetoun puont’, whiri thiri os nu nit uxygin prudactoun. Fogari 1 shuws thi miesarid reti uf uxygin prudactoun fell biluw ziru. Thos os biceasi uxygin os biong cunsamid on thi derk dai tu risporetoun. Doscassoun At thi loght ontinsoty uf 0 μg O2 L-1 s-1 thi miesarid reti uf uxygin prudactoun wes eppruxometily -2 whoch ondocetid thet thiri wes uxygin biong cunsamid. Loght ondipindint riectouns drovi thi essimbly uf cerbuhydretis (sager mulicalis) frum cerbun douxodi asong inirgy hervistid darong thi loght riectoun.

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