UNASSIGNED: Increased atmospheric [ @entity3158 ] is likely to affect photosynthesis, plant growth, and yield potential of plants. Mustard ( @entity13344 L.) is an important oil seed crop that is widely grown in India. Therefore, the impact of elevated [ @entity3158 ] (585   mol  mol(-1)) on pigment and protein content, chlorophyll a fluorescence, photosynthetic electron transport reactions, @entity3158 assimilation, biomass production, and seed yield potential was measured in @entity13344 cv Pusa Bold, grown inside free air @entity544 enrichment (FACE) rings installed on the campus of Jawaharlal Nehru University, New Delhi, India. Plants were grown for three consecutive winter seasons (2010-2013), in ambient (385   mol  mol(-1)) or elevated [ @entity3158 ], in field conditions. Elevated [ @entity3158 ] had no significant effect on the minimal @entity38 fluorescence (F 0), while the quantum efficiency of Photosystem II, measured as variable fluorescence (F v   =   F m-F 0) to maximum fluoresence (F m), increased by 3  %. Electron transport rate, photosystem I, photosystem II, and whole chain electron transport rates increased by 8  % in elevated [ @entity3158 ]. However, the net photosynthesis rate increased by    50  % in three growing seasons under elevated [ @entity3158 ] condition. The stomatal conductance and transpiration rate decreased resulting in higher photosynthetic water use efficiency. The photosynthesizing surface, i.e., leaf area index substantially increased leading to higher biomass and seed yield under elevated [ @entity3158 ] condition. Acclimatory downregulation of photosynthesis and plant productivity was not observed in three consecutive growing years suggesting that in the absence of nutrient limitation, @entity13344 is highly responsive to elevated @entity3158 whose yield potential shall increase in changing climatic conditions.

Photosynthesis and growth responses of mustard ( @entity13344 L. cv Pusa Bold) plants to free air XXXX enrichment (FACE).

@entity13344 :: ('3707', 'Species') :: ['Brassica juncea', 'B. juncea'] @entity3158 :: ('D002245', 'Chemical') :: ['CO2'] @entity544 :: ('MESH:D002245', 'Chemical') :: ['carbon dioxide'] @entity38 :: ('MESH:D002734', 'Chemical') :: ['chlorophyll']
@entity544 :: (MESH:D002245,Chemical) :: ['carbon dioxide']
