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Photosynthetica

, Volume 56, Issue 4, pp 1039–1046 | Cite as

Effect of ammonium/nitrate ratio on pak choi (Brassica chinensis L.) photosynthetic capacity and biomass accumulation under low light intensity and water deficit

  • H.Q. Shang
  • G.M. Shen
Original paper
  • 32 Downloads

Abstract

We conducted a hydroponic experiment in order to study effects of the ammonium/nitrate ratio (0:15, 5:10, 7.5:7.5, and 10:5) on photosynthetic characteristics and biomass accumulation in Brassica chinensis under low light intensity and water stress. Results showed that net photosynthetic rate, transpiration rate, intrinsic water-use efficiency, stomatal conductance, intercellular CO2 concentration, effective quantum yield of PSII photochemistry, electron transport rate, and nonphotochemical quenching were lower in the treatment (low light intensity and water deficit) than those in the control, whereas stomatal limitation increased. Minimum fluorescence, maximal quantum yield of PSII photochemistry, and photochemical quenching were largely unchanged. Pigment contents first increased and then decreased as the ammonium/nitrate ratios were altered, with significant differences between treatment and control observed at all ratios except for 10:5. Biomass first increased slightly and then decreased both in treated and control plants. Results suggest that economic losses caused by extreme conditions can be minimized by a proper adjustment of the ammonium/nitrate ratio.

Additional key words

chlorophyll fluorescence electron transport rate nitrate reductase NH4+ NO3 stomatal conductance water-use efficiency 

Abbreviations

Car

carotene

Chl

chlorophyll

Ci

intercellular CO2 concentration

E

transpiration rate

ETR

electron transport rate

Fm

maximum fluorescence

F0

minimum fluorescence

Fs

fluorescence at stable state

Fv

variable fluorescence

Fv/Fm

maximal quantum yield of PSII

gs

stomatal conductance

Ls

stomatal limitation

NPQ

nonphotochemical quenching

NR

nitrate reductase

PEG

polyethylene glycol

PN

net photosynthetic rate

qP

photosynthetic quenching

WUE

intrinsic wateruse efficiency (= PN/gs)

ΦPSII

effective quantum yield of PSII photochemistry

Ψw

water potential

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Copyright information

© The Institute of Experimental Botany 2018

Authors and Affiliations

  1. 1.Key Laboratory of Plant Biology, Department of Life SciencesHeze UniversityHeze, ShandongChina

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