期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 31, 期 3, 页码 553-563出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-008-0265-0
关键词
Black locust; Chlorophyll fluorescence; Drought; Leaf inclination; Light acclimation; Photosynthetic plasticity
资金
- Natural Science Foundation of Shandong Province [Z2006D04, Z2007D02]
- Program for New Century Excellent Talents, University of China [NCET-070511]
- Shandong Distinguished Middle-aged and Young Scientist Encouraged and Reward Foundation [2006BS08004]
Leaf morphological, physiological and biochemical characteristics of Robinia pseudoacacia L. seedlings were studied under different stress conditions. The plants were subjected to drought and shade stress for one month. Leaf inclination, chlorophyll fluorescence and chlorophyll content were measured at the first day (short-term stress) and at the end of the stress period (long-term stress) and in the recovery period. Leaf inclination was affected mainly by light; a low level of irradiance caused leaves to be arranged horizontally. Diurnal rhythmicity was lost after the long-term stress, but resumed, in part, in the recovery period. Drought stress caused leaves to tilt more obviously and decreased damage to the photosystem. Sun avoiding movement in a single leaf and sun tracking movement in the whole plant coexisted. Significant physiological changes occurred under different conditions of light. Increased energy dissipation and light capture were the main responses to high and low level of irradiance, respectively, and these were reflected by changes of chlorophyll fluorescence and chlorophyll content. Phenotypic plasticity in the leaflet enhanced the protective response to stress. These adaptive mechanisms may explain better survival of R. pseudoacacia seedlings in the understory, especially during the drought periods, and made it to be the preponderant reforestation species in Shandong Province of China.
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