Dynamic changes in photosynthesis and chlorophyll fluorescence in Nicotiana tabacum infested by Bemisia tabaci (Middle East-Asia Minor 1) nymphs
文献类型: 外文期刊
第一作者: Li, Qingliang
作者: Li, Qingliang;Xue, Ming;Zhao, Haipeng;Li, Qingliang;Tan, Wei;Wang, Chenxiang
作者机构:
关键词: Middle East-Asia Minor 1;Nicotiana tabacum;Plant growth;Photosynthesis;Chlorophyll fluorescence
期刊名称:ARTHROPOD-PLANT INTERACTIONS ( 影响因子:1.988; 五年影响因子:2.059 )
ISSN: 1872-8855
年卷期: 2013 年 7 卷 4 期
页码:
收录情况: SCI
摘要: Bemisia tabaci Middle East-Asia Minor 1 (MEAM1) is a worldwide pest. To determine whether MEAM1 nymphs produce the same symptoms in different host plants, we measured the plant growth and chlorophyll content of tobacco and cotton plants that were infested by MEAM1 nymphs. Furthermore, to investigate the spatial and temporal changes in photosynthesis caused by MEAM1 nymphs, the net photosynthetic rate (Pn) and chlorophyll a fluorescence of local and systemic tobacco leaves were assayed at 8, 11, 14, and 20 days after MEAM1 adult removal, which represent the stages of 1st, 2nd, 3rd, and 4th instar nymphs, respectively. The results showed that MEAM1 nymph infestation reduced the plant height and internode length of tobacco at 14 and 20 days, as well as the dry weight of infested and systemic tobacco leaves. However, MEAM1 nymph infestation did not affect the plant height or internode length of cotton. Also, the dry weight and chlorophyll and carotenoid content of infested and systemic leaves of cotton plants were not influenced by MEAM1 nymph infestation. However, the contents of chlorophyll a and b and carotenoids in infested tobacco leaves decreased over time; the chlorophyll a content of systemic tobacco leaves decreased at 11, 14, and 20 days. The chlorophyll and carotenoid contents in infested and systemic leaves of cotton plants were not influenced by MEAM1 nymph infestation. In addition, the Pn of infested tobacco leaves decreased at 14 and 20 days, while the Pn in systemic tobacco leaves decreased after 11 days. The greatest decrease in performance index on absorption basis (PI (ABS) ) of infested and systemic tobacco leaves occurred on day 14. The fluorescence intensity at 2 ms (J peak) and 300 mu s (K peak) increased on day 14, which indicates that 3rd instar nymphs caused serious damage to the primary photochemical reactions and donor side of PSII. These results suggest that MEAM1 nymph infestation had different effects on tobacco and cotton plants. The infestation caused spatial and temporal changes in photosynthesis in tobacco plants. The lower chlorophyll a content may have been related to the lower net photosynthetic rate of systemic and infested tobacco leaves. The decreased stability of the oxygen-evolving complex and the reaction center of PSII and the decrease in electron transport were the main reasons for the decrease in the level of photosynthesis in tobacco leaves caused by MEAM1 nymphs during various stages of infestation.
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