Effects of Continued NaCl Stress on Chlorophyll Fluorescence Parameters and Electron Transport of Nasturtium officinale R.Br.

doi:10.7668/hbnxb.2014.06.029

Abstract

Abstract: Our objective was to explore the effects of continued NaCl Stress on chlorophyll fluorescence parameters and electron transport of Nasturtium officinale seedlings. Nasturtium officinale seedlings were treated with continued NaCl(0,1,2,3,4 g/kg)in plastic pots with soil.We studied the effects of continued NaCl on growth,chlorophyll content and chlorophyll fluorescence parameters after 60 days.The results indicated that with the increase of NaCl concentration in the range of 1-3 g/kg,Chlorophyll content and minimal fluorescence (Fo) increased,while maximum fluorescence (Fm),potential photochemical efficiency (Fv/Fo),photochemical maximum efficiency of PSⅡ(Fv/Fm) and the ability of leaves to transform energy decreased;Moreover,the actual quantum yield Y (Ⅱ) decreased,while non-photochemical quenching coefficient (NPQ) increased,and leaves maintained a high actinic light energy distribution by adjusting the heat dissipation;In addition,photochemical quenching coefficient (qP) and electron transport rate (ETR) decreased,plastoquinone (Q_A) tended to be restored state,and the electron transfer was inhibited.4 g/kg NaCl treatment caused the damage of PSⅡ,meanwhile,Q_A was restored excessively,electron transfer was obviously inhibited,energy conversion,transmission and distribution could not work normally,root to shoot ratio was decreased by 62.5% compared to the control,and the growth of Nasturtium officinale was weakened significantly.All results suggested that the tolerance concentration of continued NaCl stress on Nasturtium officinale R.Br. was 3 g/kg.

Key words: Continued NaCl stress, Nasturtium officinale R.Br., Chlorophyll fluorescence parameters, Electron transport

CLC Number:

S634.01

TANG Jian, HE Zhong-qun, JU Li-ping, TAN Ming-ming. Effects of Continued NaCl Stress on Chlorophyll Fluorescence Parameters and Electron Transport of Nasturtium officinale R.Br.[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 172-176. doi: 10.7668/hbnxb.2014.06.029.

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