Plant Water-Stress Response Mechanisms

Akinci, Şener; Lösel, Dorothy M.

doi:10.5772/29578

Cited by 67 publications

(65 citation statements)

References 92 publications

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“…Except for the 2010-2011 crop season, considering the average of all genotypes, the protein content under VS was similar or even inferior to those observed under the I and RF conditions (Table 4). This result may be due to lower vegetative growth under VS, with reduced leaf area expansion [29]. Since N translocated to grains is partly remobilized from leaves [30], a smaller leaf area decreases the availability of N to be remobilized.…”

Section: Resultsmentioning

confidence: 95%

Effect of Water Deficit-Induced at Vegetative and Reproductive Stages on Protein and Oil Content in Soybean Grains

et al. 2017

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Soybean is one of the most common grain crops worldwide, representing an important protein and oil source. Although genetic variability in the chemical composition of grains is seen in soybean, the mean levels of proteins have remained stagnant or, in some cases, have decreased over time, arousing concern in the agricultural industry. Furthermore, environmental conditions influence the chemical composition of grains. Thus, the present study evaluated the effect of water deficit (WD) induced at the vegetative period (vegetative stress (VS)) and reproductive period (reproductive stress (RS)) on the protein and oil contents of grains in different soybean genotypes. Yield and its components were evaluated to evaluate the interrelation of these traits. The experiment was completed over three crop seasons under field conditions in Londrina, Paraná (PR), Brazil. WD was induced using rainout shelters and then stress treatments with irrigated and non-irrigated conditions were compared. WD negatively affected yield and its components. All evaluated genotypes showed similar responses for oil and protein contents under different water conditions. Higher protein content and lower oil content were observed in grains under RS. Such a relationship was not equally established under VS. Additionally, negative relationships between protein and oil content and between protein content and yield were confirmed.

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Section: Resultsmentioning

confidence: 95%

Effect of Water Deficit-Induced at Vegetative and Reproductive Stages on Protein and Oil Content in Soybean Grains

et al. 2017

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“…The water deficit had a lower leaf water potential in longan trees at 10 days after treatment due to decreasing of moisture content in growing media. The reduction of leaf water potential decreased leaf photosynthesis characteristics in longan tree because water deficit led to decreasing turgor pressure (Akinci & Lösel, 2012). Moreover, Drought conditions are usually associated with a decrease in plant productivity and the course of growth leads to the increase of abscisic acid (ABA) and decrease of indole-3-acetic acid (IAA) and cytokinins (CKs), which may result in the early stoppage of branch growth in comparison with its natural trend (Bradford & Hsiao, 1982;Ferguson et al, 1992) The treatment with KClO 3 induced the longan flowering process and could be used for off-season longan production.…”

Section: Discussionmentioning

confidence: 99%

Influence of Water Regimes and Potassium Chlorate on Floral Induction, Leaf Photosynthesis and Leaf Water Potential in Longan

Sritontip¹,

Tiyayon²,

Sringam³

et al. 2013

JAS

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This study verifies the influence of water regimes and potassium chlorate (KC1O 3 ) on photosynthetic rate, flower emergence and media moisture content of longan trees. The trees were grown in 150 liters lysimeter tanks filled with fine sand. The experimental design was a 2x2 factorial in completely randomized design (CRD) with 2 factors; 1) two levels of water regimes (well-watered and water deficit) and 2) two levels of KClO 3 at 10 and 0 g. The results revealed that the well-watered treatment produced faster days of terminal bud break than that of the water deficit treatment. The 10 g KClO 3 treatment induced 91 % flower emergence at 35 days after commencing the treatment, while the 0 g KClO 3 treatment had 82 % leaf flushing and had no flower emergence. Water deficit or KClO 3 treatments reduced the net carbondioxide (CO 2 ) exchange, transpiration and stomatal conductance rates. Moreover, the combination of well-watered and 0 g KClO 3 treatments gave the greatest values of the parameters. The well-watered treatment had higher volumetric water content in the growing medium and leaf water potential than the water deficit treatment, while for the 10 g and 0 g KClO 3 treatments had similar the media moisture content.

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“…This response pattern was attributed to partial stomatal closure, which affects photosynthesis (Akinci and Lösel, 2012;Lisar et al, 2012), showing that stomata in this species are strongly sensitive to drought. The decreases in stomatal conductance were accompanied by a drop in water potential throughout the experimental period.…”

Section: Discussionmentioning

confidence: 99%

“…Drought conditions are normally associated with low precipitation, high evaporative demand, and high temperatures and irradiation, which makes the water deficit a multidimensional stress (Larcher, 2000). Under water deficit conditions, plant growth and development are affected by changes in turgor pressure, cell wall elasticity, carbon assimilation and opening and closing of stomata (Akinci and Lösel, 2012;Wang et al, 2012). In addition, metabolic changes can occur, including increased photorespiration (Lambers et al, 2008), antioxidant enzyme activity (Reddy et al, 2004) and production of secondary metabolites (Saeidnejad et al, 2013;Selmar and Kleinwächter, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of water deficit on morphophysiology, productivity and chemical composition of Ocimum africanum Lour (Lamiaceae)

Santos¹,

Souza²,

Costa³

et al. 2016

Afr. J. Agric. Res.

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Mechanisms by which plants acclimatize to water deficit conditions can affect development and, especially in aromatic plants, the essential oil synthesis. To evaluate the effects of water deficit on Ocimum africanum, seedlings were exposed to water levels corresponding to 100, 80, 70 and 60% of the substrate field capacity. The different watering regimes corresponded to predawn water potentials of -0.5, -0.9, -1.6 and -1.9 MPa, respectively. Decreased stomatal conductance and increased glandular and tector trichome density were observed under water deficit. In addition, reductions in leaf gas exchange and water consumption under water deficit led to decreased plant height, numbers of leaves and inflorescences, and total biomass production. As a result, lower essential oil yield and water use efficiency for biomass production occurred in the -1.9 MPa treatment. The content and production efficiency of essential oil (quantity of oil produced per unit water consumed) were higher in the -0.9 and -1.6 MPa treatments. There were no significant differences among treatments in the chemical composition of essential oil, and the major component of essential oil in leaves and inflorescences was isoeugenol in all treatments. The 80% field capacity watering regime (branch water potential of -0.9 MPa) was best for the growth and production of essential oil in O. africanum, for the cultivation of aromatic plant under drought economically viable in the semi-arid climatic regions.

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Plant Water-Stress Response Mechanisms

Cited by 67 publications

References 92 publications

Effect of Water Deficit-Induced at Vegetative and Reproductive Stages on Protein and Oil Content in Soybean Grains

Effect of Water Deficit-Induced at Vegetative and Reproductive Stages on Protein and Oil Content in Soybean Grains

Influence of Water Regimes and Potassium Chlorate on Floral Induction, Leaf Photosynthesis and Leaf Water Potential in Longan

Effects of water deficit on morphophysiology, productivity and chemical composition of Ocimum africanum Lour (Lamiaceae)

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