Variation in relative water content, proline accumulation and stress gene expression in two cowpea landraces under drought

Zegaoui, Zahia; Planchais, Séverine; Cabassa, Cécile; Djebbar, R.; Belbachir, O.; Carol, Pierre

doi:10.1016/j.jplph.2017.07.009

Cited by 115 publications

(66 citation statements)

References 67 publications

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“…In our study significantly higher proline content was recorded in onion variety Bhima Kiran that might protect the cellular membrane and the various metabolic processes associated with it under water deficit condition (Table 2). A recent finding in cowpea by Zegaoui et al, (2017) supports the present result in onion crop under drought stress.…”

Section: Physiological and Biochemical Traitssupporting

confidence: 90%

Physiological and Biochemical Responses in Onion Crop to Drought Stress

Ghodke¹,

Andhale²,

Gijare³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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Section: Physiological and Biochemical Traitssupporting

confidence: 90%

Physiological and Biochemical Responses in Onion Crop to Drought Stress

Ghodke¹,

Andhale²,

Gijare³

et al. 2018

Int.J.Curr.Microbiol.App.Sci

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“…Meanwhile, water stress increased D in order to counteract the inadequate water status, as indicated by the lower RWC. Several studies have also shown a decrease in RWC with increasing water stress (Boughalleb and Hajlaoui 2011;Ghahfarokhi et al 2015;Zegaoui et al 2017). Water stress can increase D since reductions in turgor pressure and cell expansion result in the same dry mass within a smaller leaf area (Peña-Rojas et al 2005).…”

Section: Discussionmentioning

confidence: 98%

Olive response to potassium applications under different water regimes and cultivars

Ferreira

Arrobas

Moutinho-Pereira

et al. 2018

Nutr Cycl Agroecosyst

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Although potassium (K) is a macronutrient few studies have evaluated the response of olive tree to K fertilization. In this work results of two field and two pot K fertilizer experiments are presented. One of the field trials was conducted in a commercial young olive grove. The second was conducted in a plantation purposely established for this study. In the two field and the first pot experiment, the K supply was the single variation factor. The second pot experiment was arranged as a factorial with two K rates, two water regimes and two cultivars ('Arbequina' and 'Cobrançosa'). K supply did not increase olive tree growth or yield. Accumulated olive yield in the first field experiment, for instance, varied from 2.46 and 2.84 kg tree -1 , respectively in K treated and untreated plants. K supply increased the shoot/root ratio (1.6-2.0 from the control to the most fertilized treatment) and the concentration of K in roots (2.9-11.2 g kg -1 ) to a greater extent than in leaves (7.0-11.9 g kg -1 ), suggesting that shoots are a priority sink for K and roots may store the nutrient as a reserve. Plant water status and chlorophyll a fluorescence were not significantly affected by K applications. Plants suffering from water stress yielded less phytomass (40.2-56.4 g pot -1 , respectively in control and well-watered plants) and showed higher K concentrations in leaves (14.2-11.6 g kg -1 ) and lower in roots (4.9-6.8 g kg -1 ) which is probably due to the reduction of K uptake from the dry soil. 'Cobrançosa' appeared to be more tolerant to water stress than 'Arbequina'. These experiments showed a poor response of olive tree to K fertilization. Considering that K is usually applied by farmers every year, it seems that further studies on K fertilization in olive are needed in order to adjust K fertilizer rates to crop needs.

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“…Since stem diameter shrinkage indicators such as the maximum daily shrinkage, daily stem diameter increment, and daily stem diameter variation cannot reflect sap flow at a half-hour time resolution, TWD is considered a better choice for indicating sap flow when the time scale required is less than 1 day. Transpiration can cause variations in plant moisture indices, including plant moisture content [34,35], water potential [36], and stem sap flow [37,38]. It would be good to acknowledge that coupled TWD and actual tree water content, for example, using time domain reflectometry probes or frequency domain reflectometry probes [39], should be analyzed to confirm whether TWD is a good tree moisture indicator.…”

Section: Discussionmentioning

confidence: 99%

The Relationship between Stem Diameter Shrinkage and Tree Bole Moisture Loss Due to Transpiration

Tian

Zhang

et al. 2019

Forests

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The responsiveness of four types of stem diameter shrinkage indicators to sap flow changes was compared under four air temperature and cloudiness conditions: above 0 °C below 80% cloud cover days; above 0 °C large percentage cloud cover days; low temperature below 80% cloud cover days; and low temperature large percentage cloud cover days. In this study, we investigated the effects of indicative functions of relatively easy-to-access stem diameter shrinkage on variation characteristics of sap flow. High-resolution-based stem diameter shrinkage is related to changes in tree moisture content. Stem diameter shrinkage indicators are adopted to confirm sap flow changes resulting from transpiration pull, which may enhance the power of stem diameter shrinkage as an index for tree bole moisture loss. After measuring stem diameter variations, the following stem diameter shrinkage indicators were calculated: maximum daily shrinkage, daily stem diameter increment, daily stem diameter variation, and tree water deficit-induced stem shrinkage (TWD). Sap flow was measured synchronously, and stem diameter shrinkage indicators were analyzed to confirm their responses to sap flow. TWD was positively correlated (r ≥ 0.317) with daily variations in sap flow and reached extremely significant levels (p ≤ 0.001) under all conditions. TWD and maximum daily shrinkage were able to better reflect the correlation between changes in stem diameter and sap flow on a daily scale, except large percentage cloud cover days with low temperatures. Changes in stem diameter had no correlation with sap flow during low temperature and large percentage cloud cover days. Among all stem diameter shrinkage indicators, TWD showed the highest correlation (r ≥ 0.601 and p ≤ 0.001) with sap flow under all conditions, except during large percentage cloud cover days with low temperatures. The stem diameter shrinkage indicators did not reflect sap flow changes during large percentage cloud cover days with low temperatures. The indicator that best reflected moisture loss of trees was TWD.

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Variation in relative water content, proline accumulation and stress gene expression in two cowpea landraces under drought

Cited by 115 publications

References 67 publications

Physiological and Biochemical Responses in Onion Crop to Drought Stress

Physiological and Biochemical Responses in Onion Crop to Drought Stress

Olive response to potassium applications under different water regimes and cultivars

The Relationship between Stem Diameter Shrinkage and Tree Bole Moisture Loss Due to Transpiration

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