Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.17957/IJAB/15.0599 |
Photosystem II Function Response to Drought Stress in Leaves of Two Alfalfa (Medicago sativa) Varieties | |
Zhang, Hui-hui1; Xu, Nan2; Sui, Xin3; Zhong, Hai-xiu2; Yin, Ze-peng4; Li, Xin1; Sun, Guang-yu5 | |
通讯作者 | Yin, Ze-peng ; Li, Xin |
来源期刊 | INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY |
ISSN | 1560-8530 |
EISSN | 1814-9596 |
出版年 | 2018 |
卷号 | 20期号:5页码:1012-1020 |
英文摘要 | The two main alfalfa varieties cultivated in northern China, Medicago sativa CV. Zhaodong and Medicago sativa CV. WL353HQ, were used to study the photosynthetic responses to drought stress. Changes in the content of chlorophyll and water in leaves during drought stress were studied using potted plants with natural drought treatment, and the effects of drought stress on the photosystem II(PSII) functions of leaves were also studied using a rapid chlorophyll fluorescence kinetics technique. Under drought stress, the chlorophyll and water content of WL353HQ leaves, although reduced, were significantly greater than those of Zhaodong leaves. On day 4 of drought stress, with the relative water content of soil at 56.3%, the maximum photochemical efficiency (Fv/Fm) of PSII and the photosynthetic performance index (PIABS) based on light energy absorption of the leaves started to decrease, and PIABS was more sensitive than Fv/Fm. The standardized OJIP curves of the two types of leaves showed that under drought stress, the values of the relative variable fluorescence of point J at 2 ms(V-J), were significantly increased. The relative variable fluorescence of point K at 0.3 ms(V-K), and point I at 30 ms(V-I), incurred only small changes, which indicated that the main reason for the drought-induced decrease of PSII photochemical activity was related to the obstruction of electron transfer from QA to QB on the acceptor side of PSII. After 10 days of drought treatment, with a relative soil water content of 29.9%, the relative variable fluorescence of point L at 0.15 ms, V-L, showed no significant changes throughout the drought process, and there was no significant difference between the two varieties, which indicated that there was no dissociation of thylakoid membranes in the leaves. However, the light energy absorption per unit reaction center (ABS/RC) of the two leaf types were significantly increased, thus indicating that the number of reaction centers in the leaves were greatly reduced. Drought stress also incurred a decrease in the proportion of absorbed light energy for electron transfer, while the proportion of energy dissipation was increased in both leaf types, which was an important reason for the decrease of photochemical activity in the leaves. The degree of PSII function in Zhaodong alfalfa leaves under drought stress was significantly less inhibited than those of WL353HQ, therefore, Zhaodong alfalfa should be considered an important alfalfa variety in arid regions of China. (C) 2018 Friends Science Publishers |
英文关键词 | Alfalfa Drought stress Chlorophyll fluorescence Photosystem II Photoinhibition |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000432042400008 |
WOS关键词 | WATER-USE EFFICIENCY ; CHLOROPHYLL FLUORESCENCE ; HIGH-TEMPERATURE ; PHOTOSYNTHESIS ; ACCUMULATION ; ARABIDOPSIS ; TOLERANCE ; PATHWAY ; TOBACCO ; PLANTS |
WOS类目 | Agriculture, Multidisciplinary ; Biology |
WOS研究方向 | Agriculture ; Life Sciences & Biomedicine - Other Topics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/210121 |
作者单位 | 1.Northeast Agr Univ, Coll Resources & Environm, Harbin 150030, Heilongjiang, Peoples R China; 2.Heilongjiang Acad Sci, Nat Resources & Ecol Inst, Harbin 150040, Heilongjiang, Peoples R China; 3.Heilongjiang Univ, Coll Life Sci, Harbin 150040, Heilongjiang, Peoples R China; 4.Shenyang Agr Univ, Coll Hort, Shenyang 110866, Liaoning, Peoples R China; 5.Northeast Forest Univ, Coll Life Sci, Harbin 150040, Heilongjiang, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Hui-hui,Xu, Nan,Sui, Xin,et al. Photosystem II Function Response to Drought Stress in Leaves of Two Alfalfa (Medicago sativa) Varieties[J],2018,20(5):1012-1020. |
APA | Zhang, Hui-hui.,Xu, Nan.,Sui, Xin.,Zhong, Hai-xiu.,Yin, Ze-peng.,...&Sun, Guang-yu.(2018).Photosystem II Function Response to Drought Stress in Leaves of Two Alfalfa (Medicago sativa) Varieties.INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY,20(5),1012-1020. |
MLA | Zhang, Hui-hui,et al."Photosystem II Function Response to Drought Stress in Leaves of Two Alfalfa (Medicago sativa) Varieties".INTERNATIONAL JOURNAL OF AGRICULTURE AND BIOLOGY 20.5(2018):1012-1020. |
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