Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat

doi:10.1016/S2095-3119(13)60346-9

Journal of Integrative Agriculture ›› 2013, Vol. 12 ›› Issue (12): 2164-2171.DOI: 10.1016/S2095-3119(13)60346-9

Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat

LIN Ye-chun, HU Yue-gao, REN Chang-zhong, GUO Lai-chun, WANG Chun-long, JIANG Ying

1.College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2.Baicheng Academy of Agricultural Sciences, Baicheng 137000, P.R.China
3.KZN Department of Agriculture, Nquthu 3135, Republic of South Africa

收稿日期:2012-11-01 出版日期:2013-12-01 发布日期:2013-12-17
通讯作者: ZENG Zhao-hai, Tel: +86-10-62733847, E-mail: zengzhaohai@cau.edu.cn
作者简介:LIN Ye-chun, E-mail: linyechun@cau.edu.cn
基金资助:
We are grateful to the study grants from the Special Fund for Agro-Scientific Research in the Public Interest, China (nyhyzx07-009-2) and the Earmarked Fund for China Agriculture Research System (CARS-08-B-1).

Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat

LIN Ye-chun, HU Yue-gao, REN Chang-zhong, GUO Lai-chun, WANG Chun-long, JIANG Ying

1.College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2.Baicheng Academy of Agricultural Sciences, Baicheng 137000, P.R.China
3.KZN Department of Agriculture, Nquthu 3135, Republic of South Africa

Received:2012-11-01 Online:2013-12-01 Published:2013-12-17
Contact: ZENG Zhao-hai, Tel: +86-10-62733847, E-mail: zengzhaohai@cau.edu.cn
About author:LIN Ye-chun, E-mail: linyechun@cau.edu.cn
Supported by:
We are grateful to the study grants from the Special Fund for Agro-Scientific Research in the Public Interest, China (nyhyzx07-009-2) and the Earmarked Fund for China Agriculture Research System (CARS-08-B-1).

摘要/Abstract

摘要： Naked oat (Avena nuda L.) was originated from China, where soil nitrogen (N) is low availability. The responses of chlorophyll (Chl.) fluorescence parameters and leaf gas exchange to N application were analysed in this study. After the N application rate ranged from 60 to 120 kg ha-1, variable fluorescence (Fv), the maximal fluorescence (Fm), the maximal photochemical efficiency (Fv/Fm), quantum yield (ΦPS II) of the photosynthetic system II (PS II), electron transport rate (ETR), and photochemical quenching coefficient (qP) increased with N application level, however, non-photochemical quenching coefficient (qN) decreased. Moreover, there was no difference in initial fluorescence (Fo) with further more N enhancement. The maximum net photosynthetic rate (Pmax), apparent dark respiration rate (Rd) and light saturation point (LSP) were improved with 40-56 kg N ha-1 as basal fertilizer and 24-40 kg N ha-1 as top dressing fertilizer applied at jointing stage. Initial quantum yield (α) was decreased with 24 kg N ha-1 as basal fertilizer and 56 kg N ha-1 as top dressing fertilizer. Flag-leaf net photosynthetic rate (Pn) was significantly enhanced at the jointing and heading stages with 40-56 kg N ha-1 as basal fertilizer; in addition, increased at grain filling stage of naked oat with 40-56 kg N ha-1 as top dressing fertilizer. 90 kg N ha-1 (50-70% as basal fertilizer and 30-50% as top dressing fertilizer) application is recommended to alleviate photodamage of photosystem and improve the photosynthetic rate in naked oat.

关键词: Avena nuda , nitrogen fertilizer , nitrogen application , chlorophyll fluorescence , gas exchange

Abstract: Naked oat (Avena nuda L.) was originated from China, where soil nitrogen (N) is low availability. The responses of chlorophyll (Chl.) fluorescence parameters and leaf gas exchange to N application were analysed in this study. After the N application rate ranged from 60 to 120 kg ha-1, variable fluorescence (Fv), the maximal fluorescence (Fm), the maximal photochemical efficiency (Fv/Fm), quantum yield (ΦPS II) of the photosynthetic system II (PS II), electron transport rate (ETR), and photochemical quenching coefficient (qP) increased with N application level, however, non-photochemical quenching coefficient (qN) decreased. Moreover, there was no difference in initial fluorescence (Fo) with further more N enhancement. The maximum net photosynthetic rate (Pmax), apparent dark respiration rate (Rd) and light saturation point (LSP) were improved with 40-56 kg N ha-1 as basal fertilizer and 24-40 kg N ha-1 as top dressing fertilizer applied at jointing stage. Initial quantum yield (α) was decreased with 24 kg N ha-1 as basal fertilizer and 56 kg N ha-1 as top dressing fertilizer. Flag-leaf net photosynthetic rate (Pn) was significantly enhanced at the jointing and heading stages with 40-56 kg N ha-1 as basal fertilizer; in addition, increased at grain filling stage of naked oat with 40-56 kg N ha-1 as top dressing fertilizer. 90 kg N ha-1 (50-70% as basal fertilizer and 30-50% as top dressing fertilizer) application is recommended to alleviate photodamage of photosystem and improve the photosynthetic rate in naked oat.

Key words: Avena nuda , nitrogen fertilizer , nitrogen application , chlorophyll fluorescence , gas exchange

LIN Ye-chun, HU Yue-gao, REN Chang-zhong, GUO Lai-chun, WANG Chun-long, JIANG Ying. Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat[J]. Journal of Integrative Agriculture, 2013, 12(12): 2164-2171.

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Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat

Effects of Nitrogen Application on Chlorophyll Fluorescence Parameters and Leaf Gas Exchange in Naked Oat

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