Physiological indexes of six plant species from the tibetan plateau under drought stress

Xin, 潘昕 Pan; Quan, 邱权 Qiu; Jiyue, 李吉跃 Li; Junhui, 王军辉 Wang; Qian, 何茜 He; Yan, 苏艳 Su; Jianwei, 马建伟 Ma; Kun, 杜坤 Du

doi:10.5846/stxb201306031288

Cited by 7 publications

(6 citation statements)

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“…Drought stress results in water loss and damages the cell membrane integrity of chloroplasts, which further affects chlorophyll biosynthesis and promotes its decomposition. Similarly, the RWC of both ECM and NM needles showed a large decrease under moderate and severe drought conditions, as did chlorophyll content, which is consistent with the results of Pan et al [66]. Sanchez et al [67] also reported that water loss results in a decrease in total chlorophyll content, which was also the case in this study.…”

Section: Biochemical Responsesupporting

confidence: 92%

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Wang

Zhao

et al. 2021

Forests

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Masson pine is an important afforestation species in southern China, where seasonal drought is common. The present study focused on the effects of Suillus placidus, an ectomycorrhizal fungus, inoculation on the growth and physiological and biochemical performance of masson pine seedlings under four different watering treatments (well-watered, mild drought, moderate drought, and severe drought) to evaluate the symbiotic relationship between S. placidus and masson pine seedlings. Ectomycorrhizal-inoculated (ECM) and non-inoculated (NM) seedlings were grown in pots and maintained for 60 days using the weighing method. Results showed that seedlings' growth, dry weight, RWC, chlorophyll content, PSII efficiency, and photosynthesis decreased as drought stress intensified in both ECM and NM plants. This suggests that drought stress significantly limits the growth and photosynthetic performance of masson pine seedlings. Nevertheless, increased An/gs and proline contents in both NM and ECM prevented oxidative damage caused by drought stress. In addition, increased peroxidase (POD) activity is an essential defense mechanism of ECM seedling under drought stress. Compared with NM, ECM seedlings showed faster growth, higher RWC, and photosynthetic performance, and lower lipid peroxidation in cell membranes under drought stress, as indicated by higher POD activity and lower proline and malondialdehyde (MDA). Our experiment found that S. placidus inoculation can enhance the drought resistance of masson pine seedlings by increasing antioxidant enzyme activity, water use efficiency, and proline content, thereby enhancing growth under water-deficiency conditions. S. placidus can be used to cultivate high-quality seedlings and improve their survival in regions that experience seasonal droughts.

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Section: Biochemical Responsesupporting

confidence: 92%

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Wang

Zhao

et al. 2021

Forests

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“…SOD activity of licorice (Pan et al, 2006), cowpea (Manivannan et al, 2007), poplar (Xiao et al, 2008), sunflower (Gunes et al, 2008), and tomato (Celik et al, 2017) increases under drought stress. The plant-water relationship plays a key role in the activation and regulation of the antioxidant defense mechanism under drought stress (Pan et al, 2014). Tolerant plants accumulate less hydrogen peroxide and free radicals by maintaining enzyme activities and have a superior protection system (Sinhababu and Kar, 2003).…”

Section: Responses Of Physiological Indicators To Drought Stress At the Seedling Stage In Oatmentioning

confidence: 99%

“…The ecological environment in the Qinghai-Tibetan Plateau is relatively fragile, and the distribution of precipitation among the four seasons is extremely irregular. A dry climate in early spring adversely affects plants' growth performance (Pan et al, 2014;Meng et al, 2017;Wang et al, 2020). It is projected that the intensity of drought may increase by 1% to 30% by 2100, as a result of global warming (Parry et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Important Physiological Changes Due to Drought Stress on Oat

Xie

Chen

et al. 2021

Front. Ecol. Evol.

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As temperatures rise and water availability decreases, the water decit is gaining attention regarding future agricultural production. Drought stress is a global issue and adversely affects the productivity of different crops. In this study, drought-tolerant varieties of oats were screened to determine drought-tolerant varieties that may be employed in drought-prone areas to achieve sustainable development and mitigate the impact of climate change. To do so, the growth and stress adaptive mechanism of 15 domestic and overseas oat cultivars at the seedling stage were analyzed. Water stress was simulated using 20% polyethylene glycol (PEG-6000). The results showed that the soluble protein content and superoxide dismutase activity of variety DY2 significantly increased under drought stress, whereas the photochemical efficiency and relative water content decreased slightly. The relative electrical conductivity (REC) and drought damage index of the QH444 and DY2 varieties increased the least. The peroxidase content of Q1 and DY2 significantly increased, and the catalase activity of Q1, QH444, and DY2 also substantially increased. Principal component analysis revealed that nine physiological and biochemical parameters were transformed into three independent comprehensive indexes. The comprehensive evaluation results showed that DY2, LN, and Q1 exhibited a strong drought resistance capacity and could be used as a reference material for a drought-resistant oat breeding program. The gray correlation analysis also indicated that Fv/Fm, chlorophyll, REC, and malondialdehyde could be used as key indexes for evaluating the drought resistance of oat.

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“…The soil moisture content of each treatment was 80% ± 5%, 65% ± 5%, 50% ± 5%, and 35% ± 5% of the field water-holding capacity, and the actual moisture content was maintained at 19. 45-22.05%, 15.56-18.16%, 11.67-17.27%, and 7.78-10.38% for the CK, LD, MD, and SD treatments, respectively (Wu et al, 2014;Pan et al, 2014). After initiating the treatments, plants stopped being watered to allow the soil moisture content to fall naturally to a predetermined range, and the soil was weighed and sampled to determine background values.…”

Section: Experimental Materials and Research Methodsmentioning

confidence: 99%

Non-structural carbohydrate dynamics of Pinus yunnanensis seedlings under drought stress and re-watering

Xiao,

Zhao,

Deng

et al. 2024

Front. Ecol. Evol.

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Non-structural carbohydrates (NSC) are an important “buffer” for maintaining plant physiological functions under drought conditions; however, our understanding of the dynamics of NSC at the organ level during sustained drought of varying intensities and re-watering remains poor. In this study, two-year-old Pinus yunnanensis seedlings were subjected to drought and re-watering trials. Plants were subjected to three drought intensities (light drought, moderate drought, and severe drought) as well as control conditions (suitable moisture) for 51 days, including 30 days of drought followed by 21 days of re-watering for drought-treated seedlings, to study the dynamics of NSC in the leaves, stems, coarse roots, and fine roots. Changes in the distribution of NSC concentrations in the organ of P. yunnanensis seedlings under drought stress varied; in the early drought stages, the drought resistance of P. yunnanensis seedlings was enhanced by increasing soluble sugar concentrations; in later stages of drought, the stored starch in organs, stems, and coarse roots was consumed. Drought inhibited the growth of P. yunnanensis seedlings, but the maximum limit of drought tolerance was not reached under the different drought treatments after 30 days. P. yunnanensis seedlings in all treatment groups resumed growth after re-watering, and the growth of seedlings was actually promoted during re-watering in the moderate drought treatment group, indicating that drought induced the compensatory growth of seedlings. The growth of P. yunnanensis seedlings during re-watering was inhibited in the severe drought treatment group, and NSC continued to be regulated in seedlings in this group. Given that P. yunnanensis seedlings maintain growth through the consumption of coarse root starch in the late stages of drought, seedlings with a larger root-to-shoot ratio should be selected for cultivation in actual production. Based on our findings, exposure to moderate drought stress can enhance the drought tolerance of P. yunnanensis seedlings and promote the compensatory growth of seedlings.

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Physiological indexes of six plant species from the tibetan plateau under drought stress

Cited by 7 publications

References 0 publications

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Important Physiological Changes Due to Drought Stress on Oat

Non-structural carbohydrate dynamics of Pinus yunnanensis seedlings under drought stress and re-watering

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