Effects of drought stress on photosynthetic gas exchange, chlorophyll fluorescence and stem diameter of soybean plants

Three species of herbaceous perennials were tested on their ability to withstand and recover from drought stress periods of 2, 4, and 6 days. Eupatorium rugosum and Boltonia asteroides `Snowbank' were chosen because of their reported drought intolerance, while Rudbeckia triloba was chosen based on its reported drought tolerance. Drought stress began on 19 Sept. 1997. Plants were transplanted into the field the day following the end of each stress period. The effects of drought on transpiration rate, stomatal conductance, and net photosynthetic rate were measured during the stress and throughout recovery using an infrared gas analysis system. Leaf gas exchange measurements were taken through recovery until there were no differences between the stressed plants and the control plants. Transpiration, stomatal conductance, and photosynthesis of Rudbeckia and Boltonia were not affected until 4 days after the start of stress. Transpiration of Eupatorium decreased after 3 days of stress. After rewatering, leaf gas exchange of Boltonia and Rudbeckia returned to non-stressed levels quicker than Eupatorium. Growth measurements were taken every other day during stress, and then weekly following transplanting. Measurements were taken until a killing frost that occurred on 3 Nov. There were no differences in the growth between the stressed and non-stressed plants in any of the species. Plants will be monitored throughout the winter, spring, and summer to determine the effects of drought on overwintering capability and regrowth.

Download Full-text

Effects of Drought Stress on Leaf Gas Exchange Parameters in Development of Sweet Cherry Fruit

Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018) ◽

10.2991/iceesd-18.2018.71 ◽

2018 ◽

Author(s):

Jin Wang ◽

Ju Guan ◽

Xiulan Lv

Keyword(s):

Drought Stress ◽

Gas Exchange ◽

Sweet Cherry ◽

Leaf Gas Exchange ◽

Gas Exchange Parameters ◽

Effects Of Drought ◽

Exchange Parameters

Download Full-text

Effects of Drought Stress on Photosynthetic and Physiological Parameters of Tomato

Journal of the American Society for Horticultural Science ◽

10.21273/jashs04725-19 ◽

2020 ◽

Vol 145 (1) ◽

pp. 12-17 ◽

Cited By ~ 1

Author(s):

Guoting Liang ◽

Junhui Liu ◽

Jingmin Zhang ◽

Jing Guo

Keyword(s):

Soil Moisture ◽

Drought Stress ◽

Crop Yields ◽

Physiological Parameters ◽

Practical Significance ◽

Horticultural Crop ◽

Photosynthetic Gas Exchange ◽

Moisture Contents ◽

Effects Of Drought ◽

Nonstomatal Limitation

Drought has become an important factor limiting crop yields in China. As an important greenhouse horticultural crop in China, the research of tomato (Solanum lycopersicum L. cv. Jinpeng No.10) is of great theoretical and practical significance. In the study, four different relative soil moisture contents (74% to 80%, 55% to 61%, 47% to 52%, and 25% to 30%) were used to induce drought stress. We investigated changes in photosynthetic gas exchange, chlorophyll fluorescence, and other related physiological parameters in response to different relative soil moisture contents. Drought inhibited the photosynthesis of tomato significantly, as shown by a clear decline in the net photosynthetic rate. Our results indicated stomatal limitation and nonstomatal limitation were responsible for the photosynthesis reduction.

Download Full-text

Effects of Drought and Rehydration on the Physiological Responses of Artemisia halodendron

Water ◽

10.3390/w11040793 ◽

2019 ◽

Vol 11 (4) ◽

pp. 793

Author(s):

Juanli Chen ◽

Xueyong Zhao ◽

Yaqiu Zhang ◽

Yuqiang Li ◽

Yongqing Luo ◽

...

Keyword(s):

Chlorophyll Fluorescence ◽

Drought Stress ◽

Membrane Permeability ◽

Chlorophyll Content ◽

Physiological Responses ◽

Severe Drought ◽

Native Plant ◽

Chlorophyll Fluorescence Parameters ◽

Artemisia Halodendron ◽

Effects Of Drought

Artemisia halodendron is a widely distributed native plant in China’s Horqin sandy land, but few studies have examined its physiological responses to drought and rehydration. To provide more information, we investigated the effects of drought and rehydration on the chlorophyll fluorescence parameters and physiological responses of A. halodendron to reveal the mechanisms responsible for A. halodendron’s tolerance of drought stress and the resulting ability to tolerate drought. We found that A. halodendron had strong drought resistance. Its chlorophyll content first increased and then decreased with prolonged drought. Variable chlorophyll fluorescence (Fv) and quantum efficiency of photosystem II (Fv/Fm) decreased, and the membrane permeability and malondialdehyde increased. When plants were subjected to drought stress, superoxide dismutase (SOD) activity degraded under severe drought, but the activities of peroxidase (POD) and catalase (CAT) and the contents of soluble proteins, soluble sugars, and free proline increased. Severe drought caused wilting of A. halodendron leaves and the leaves failed to recover even after rehydration. After rehydration, the chlorophyll content, membrane permeability, SOD and CAT activities, and the contents of the three osmoregulatory substances under moderate drought began to recover. However, Fv, Fv/Fm, malondialdehyde, and POD activity did not recover under severe drought. These results illustrated that drought tolerance of A. halodendron resulted from increased enzyme (POD and CAT) activities and accumulation of osmoregulatory substances.

Download Full-text