Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅲ. Chlorophyll Fluorescence Kinetic Parameters

doi:10.11733/j.issn.1007-0435.2011.01.006

›› 2011, Vol. 19 ›› Issue (1): 31-37.DOI: 10.11733/j.issn.1007-0435.2011.01.006

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Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅲ. Chlorophyll Fluorescence Kinetic Parameters

XU Wei-zhou¹, XU Bing-cheng^1,2, DUAN Dong-ping¹, NIU Fu-rong¹

1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China

Received:2010-07-13 Revised:2010-09-20 Online:2011-02-15 Published:2011-02-15

不同水肥条件下白羊草光合生理生态特征研究 Ⅲ.叶绿素荧光参数

徐伟洲¹, 徐炳成^1,2, 段东平¹, 牛富荣¹

1. 西北农林科技大学, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西, 杨凌, 712100;
2. 中国科学院水利部水土保持研究所, 陕西, 杨凌, 712100

通讯作者: 徐炳成,E-mail:Bcxu@ms.iswc.ac.cn
作者简介:徐伟洲(1985- ),男,陕西蓝田人,硕士研究生,研究方向为植物生理生态适应性,E-mail:wei_zhou7758@163.com;
基金资助:
中国科学院重要方向项目(KZCX2-YW-QN412);西北农林科技大学基本科研业务费专项(QN2009079B01);教育部留学回国人员科研启动基金项目资助

Abstract

Abstract: In order to clarify the photo-physiological characteristics of old world bluestem(Bothriochloa ischaemum L.Keng.) from loess hilly-gully region under different nutrient supplies,the response characteristics to short-term water stress and rehydration treatments of the chlorophyll fluorescence kinetic parameters were determined under potted condition with three nutrient treatments(CK,P and NP).Results showed that the P and NP treatments improved old world bluestem maximum photochemical efficiency(F_v/F_m),active photochemical efficiency(Φ_PSⅡ),apparent electron transport rate(ETR) and reduced non-photochemical quenching coefficient(NPQ) under adequate water condition,which indicated more absorbed light energy was utilized in leaf photosynthesis.Under short-term water change condition,the decrease amplitude of F_v/F_m under P and NP treatments were significantly less than CK treatment,and the recovery extent was significantly higher than the latter after rehydrating.These findings suggested that the P and NP treatments can enhance the drought-tolerant ability of old world bluestem under water stress,and improve its recovery capability of leaf photosynthetic function after rehydrating.

Key words: Bothriochloa ischaemum, Chlorophyll fluorescence, Soil nutrient, Rehydration after drought stress

摘要： 本研究揭示了不同土壤养分条件下,黄土丘陵区乡土草种白羊草(Bothriochloa ischaemum L.Keng.)对土壤水分短期变化的光合生理响应及其适应性,旨在为充分发挥其光合潜力以及黄土丘陵区白羊草人工草地的建设与管理提供科学依据。采用盆栽控制试验,比较研究3种养分(CK,P和NP)处理下白羊草叶绿素荧光动力学参数对土壤短期水分胁迫和旱后复水的响应特征。结果表明:充分供水条件下,P与NP处理显著提高了白羊草叶片最大光化学效率(F_v/F_m)和实际光化学效率(Φ_PSⅡ),使表观光合电子传递速率(ETR)升高,且降低了非辐射性能量耗散(NPQ)。短期干旱胁迫下,P与NP处理的F_v/F_m降幅显著低于CK处理,复水1 d后的F_v/F_m恢复水平均显著高于CK处理(P<0.05),表明P和NP营养有助于增强白羊草对短期干旱胁迫的耐旱性及复水后叶片光合功能的恢复能力。

关键词: 白羊草, 叶绿素荧光, 土壤养分, 旱后复水

CLC Number:

Q945.11

XU Wei-zhou, XU Bing-cheng, DUAN Dong-ping, NIU Fu-rong. Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅲ. Chlorophyll Fluorescence Kinetic Parameters[J]. , 2011, 19(1): 31-37.

徐伟洲, 徐炳成, 段东平, 牛富荣. 不同水肥条件下白羊草光合生理生态特征研究 Ⅲ.叶绿素荧光参数[J]. , 2011, 19(1): 31-37.

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Study on the Photosynthetic Characteristics of Bothriochloa ischaemum under Different Water and Nutrient Conditions Ⅲ. Chlorophyll Fluorescence Kinetic Parameters

不同水肥条件下白羊草光合生理生态特征研究 Ⅲ.叶绿素荧光参数

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