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Effects of potassium deficiency on photosynthesis and photoprotection mechanisms in soybean (Glycine max (L.) Merr.)

Wang Xiaoguang ¹ Zhao Xinhua ¹ Jiang Chunji ¹ Li Chunhong ¹ Cong Shan ¹ Wu Di ¹ Chen Yanqiu ² Yu Haiqiu ¹ ^* Wang Chunyan ³ ^*

文摘	Potassium is an important nutrient element requiring high concentration for photosynthetic metabolism. The potassium deficiency in soil could inhibit soybean (Glycine max (L.) Merr.) photosynthesis and result in yield reduction. Research on the photosynthetic variations of the different tolerant soyben varieties should provide important information for high yield tolerant soybean breeding program. Two representative soybean varieties Tiefeng 40 (tolerance to K~+ deficiency) and GD8521 (sensitive to K~+ deficiency) were hydroponically grown to measure the photosynthesis, chlorophyll fluorescence parameters and Rubisco activity under different potassium conditions. With the K-deficiency stress time extending, the net photosynthetic rate (P_n), transpiration rate (Tr) and stomatal conductance (G_s) of GD8521 were significantly decreased under K-deficiency condition, whereas the intercellular CO_2 concentration (C_i) was significantly increased. As a contrast, the variations of Tiefeng 40 were almost little under K-deficiency condition, which indicated tolerance to K~+ deficiency variety could maintain higher efficient photosynthesis. On the 25th d after treatment, the minimal fluorescence (F_0) of GD8521 was significantly increased and the maximal fluorescence (F_m), the maximum quantum efficiency of PSII photochemistry (F_v/ F_m), actual photochemical efficiency of PSII (Φ_(Psll)),photochemical quenching (q_p), and electron transport rate of PSII (ETR) were significantly decreased under K~+ deficiency condition. In addition, the Rubisco content of GD8521 was significantly decreased in leaves. It is particularly noteworthy that the chlorophyll fluorescence parameters and Rubisco content of Tiefeng 40 were unaffected under K~+ deficiency condition. On the other hand, the non-photochemical quenching (q_N) of Tiefeng 40 was significantly increased. The dry matter weight of Tiefeng 40 was little affected under K~+ deficiency condition. Results indicated that Tiefeng 40 could avoid or relieve the destruction of PSll caused by exceeded absorbed solar energy under K-deficiency condition and maintain natural photosynthesis and plant growth. It was an essential physiological mechanism for low-K-tolerant soybean under K-deficiency stress.
来源	Journal of Integrative Agriculture ,2015,14(5):856-863 【核心库】
DOI	10.1016/S2095-3119(14)60848-0
关键词	soybean ; potassium deficiency ; photosynthesis ; chlorophyll fluorescence ; Rubisco content ; dry matter weight
地址	1. College of Agronomy, Shenyang Agricultural University, Shenyang, 110866 2. Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, 110161 3. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081
语种	英文
文献类型	研究性论文
ISSN	2095-3119
学科	细胞生物学;植物学
基金	国家自然科学基金 ; 辽宁省高等学校优秀人才支持计划资助项目(LNET) ; the Tianzhu Mountian Scholars Support Plan of Shenyang Agricultural University,China
文献收藏号	CSCD:5418720

参考文献共 44 共3页

引证文献 8 篇

1 Muhammad Umair Mubarak Sugar beet yield and industrial sugar contents improved by potassium fertilization under scarce and adequate moisture conditions Journal of Integrative Agriculture,2016,15(11):2620-2626
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2 Du Qi Effects of potassium deficiency on photosynthesis, chloroplast ultrastructure, ROS, and antioxidant activities in maize (Zea mays L.) Journal of Integrative Agriculture,2019,18(2):395-406
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