Diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response of six parental lines of maize released in three eras

doi:10.1016/S2095-3119(19)62693-6

Journal of Integrative Agriculture ›› 2019, Vol. 18 ›› Issue (12): 2732-2743.DOI: 10.1016/S2095-3119(19)62693-6

收稿日期:2018-08-23 出版日期:2019-12-01 发布日期:2019-12-23

Diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response of six parental lines of maize released in three eras

LI Cong-feng¹, DONG Shu-ting², LIU Rui-xian³, REN Hong¹, DING Zai-song¹, ZHAO Ming¹

¹ Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Beijing 100081, P.R.China
² College of Agriculture, Shandong Agricultural University/State Key Laboratory of Crop Biology, Tai’an 271018, P.R.China
³ Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R.China

Received:2018-08-23 Online:2019-12-01 Published:2019-12-23
Contact: Correspondence ZHAO Ming, Tel: +86-10-82108752, E-mail: zhaoming@caas.cn
About author: LI Cong-feng, Tel: +86-10-82106042, E-mail: licongfeng@caas.cn;
Supported by:
This research was funded by the National Key Research and Development Program of China (2016YFD0300103) and the earmarked fund for China Agriculture Research System (CARS-02-12).

摘要/Abstract

Abstract:

Over the past seven decades, the grain yield of maize (Zea mays L.) has increased continuously in China, mostly due to hybridization innovations, particularly recent genetic improvements in photosynthesis. In order to reveal photosynthetic characters of elite inbred lines in different ears, a field experiment was conducted at the North China Plain of Shandong Province in China. Six parental lines of maize introduced in three eras (the 1960s, 1980s, and 2000s) were investigated diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response characteristic at the grain filling stage. Compared to earlier parental lines, the 2000s parental lines always had higher net photosynthetic rate (P_n) throughout the day, especially at noon, and a mid-day depression in Pn did not occur in all hybrids parental lines. Moreover, the stomatal conductance (G_s) and water use efficiency (WUE) of the 2000s’ lines showed higher value than those of the 1960s’ and 1980s’ lines. The inbred lines differences in photosynthetic parameters were partly owing to their different quantum carboxylation efficiencies and light synthase activities. Simultaneously, the 2000s parental lines exhibited lower light and CO₂compensation points, and their higher apparent quantum yield, and carboxylation efficiency. These suggested that the modern parental lines required lower light intensity and less CO₂ to maintain a relatively high photosynthetic capacity, substantially increasing leaf physical quality and stress resistance. It provided crucial information of high photo-efficiency and stress-resistance breeding in maize.

Key words:

maize , parental inbred lines , diurnal variation , photosynthetic response , three eras

. [J]. Journal of Integrative Agriculture, 2019, 18(12): 2732-2743.

LI Cong-feng, DONG Shu-ting, LIU Rui-xian, REN Hong, DING Zai-song, ZHAO Ming. Diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response of six parental lines of maize released in three eras[J]. Journal of Integrative Agriculture, 2019, 18(12): 2732-2743.

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Diurnal variation of gas exchange, chlorophyll fluorescence, and photosynthetic response of six parental lines of maize released in three eras

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