Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity

Melgar, Juan Carlos; Syvertsen, James P.; Martı́nez, Vicente; Garcı́a-Sánchez, Francisco

doi:10.1007/s10535-008-0081-9

Cited by 63 publications

(50 citation statements)

References 36 publications

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“…Chlorophyll biosynthesis and nitrogen metabolism are also found to be affected due to high salinity (Ashraf, 2004). However, the effects of soil salinity depend on the plants' level of tolerance and the salinity level, since there are differences between species in terms of ability to maintain nutrient concentrations for growth under salt stress (Munns et al, 2002;Melgar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Spectral indices for the detection of salinity effects in melon plants

Hernández

Melendez-Pastor

Pedreño

et al. 2014

Sci. agric. (Piracicaba, Braz.)

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). Spectral data of leaves were transformed into vegetation indices indicative of the physiological status of the plants. The results showed differences for N (p < 0.05), K and Na content (p < 0.01) due to salinity suggesting different degrees of salt stress on the plants. Specific leaf area increased with salinity levels (p < 0.001). The capabilities of VNIR radiometry to assess the influence of soil salinity on melon physiology using a non-destructive method were demonstrated. A normalized difference vegetation index , and the ratio between water index (WI) and normalized difference vegetation index (WI/NDVI 750-705 ) showed significant relationships (p < 0.01) with the salinity. Therefore, this method could be used for in-situ early detection of salinity stress effects.

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Section: Introductionmentioning

confidence: 99%

Spectral indices for the detection of salinity effects in melon plants

Hernández

Melendez-Pastor

Pedreño

et al. 2014

Sci. agric. (Piracicaba, Braz.)

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“…Healthy plants with high growth capacity are generally expected to contain high levels of chlorophyll, compared to unhealthy plants ( Zarco-Tejada et al, 2004). Many studies have evaluated the effect of irrigation with saline water in different citrus varieties, specially developed in greenhouse pots (Lloyd et al, 1987;García-Sánchez & Syvertsen, 2006;Melgar, 2008;Syvertsen & Melgar, 2010) or even in vitro (Montoliu et al, 2009). However, to the best of our knowledge there are no reports of these parameters when saline reclaimed water is used for irrigation.…”

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confidence: 99%

Assessment of the viability of using saline reclaimed water in grapefruit in medium to long term

Trigueros

Tortosa

Pedrero

et al. 2014

Span. j. agric. res.

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Agriculture involves between 70% and 80% of the total water usage world-wide. In Europe, irrigated land has risen from 0.022 to 0.035 ha per capita (MARM, 2009). However, water is the most limiting factor for crop production, especially in areas where agriculture relies heavily on irrigation. The most recent forecast for climate change suggests a significant increment in temperature and a major reduction in the annual precipitation during the 21 st century, leading to a 17% decline in the water resources available for agriculture world-wide (García-Tejero et al., 2010). Therefore, the current problems of shortage of water resources available for agriculture make it imperative to look for alternative water sources for our irrigation systems. In Assessment of the viability of using saline reclaimed water in grapefruit in medium to long term AbstractCitrus trees are strongly affected by salinity, especially in countries where irrigation is required as a semi-arid Mediterranean agronomic region. The aims of the study were i) to identify the best reliable plant-based water status indicator for field grown grapefruit trees irrigated with saline reclaimed water during five years of cultivation by measuring seasonal changes in physiological parameters (i.e. gas exchange and stem water potential measurements), leaf structural traits (i.e. leaf chlorophyll content, area-based leaf nitrogen and area-based dry mass), phytotoxic elements and yield; ii) to estimate phytotoxicity thresholds at leaf level. Our results showed that the chlorophyll content was the parameter with the highest number of measures with significant differences (p ≤ 0.05, ANOVA) between trees irrigated with reclaimed water and control trees throughout growing stages. Moreover, Chl a increased linearly with area-based leaf nitrogen (R 2 = 0.63; p < 0.001) and area-based dry mass (R 2 = 0.64; p < 0.001). We also determined the salt-induced phytotoxicity thresholds at which a reduction in yields occurs; these levels were Na: 0.1 g/100 g, Cl: 0.6 g/100 g and B: 100 ppm. In conclusion, we revealed the importance of leaf chlorophyll measurements as a significance diagnostic indicator of salt stress on field grown grapefruit trees. This parameter was also related to plantbased water status indicators such as stem water potential, stomatal conductance and net photosynthesis. Additionally, a salt accumulation potential at leaf level was shown, leading to possible risk in crop sustainability in the medium to long term.Additional key words: chlorophyll; gas exchange measurements; irrigation; phytotoxic elements; plant water status; saline reclaimed water; yield.

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“…However, because of the lower energy consumption needed when absorbing inorganic ions compared to synthesizing organic compounds, plants usually accumulate inorganic ions, mainly Na + , in vacuoles to decrease water potential (Munns 2002). Plants accumulate cations, such as Na + and K + , and simultaneously accumulate inorganic anions, such as Cl - (Ghoulam et al 2002, Melgar et al 2008, or synthesize organic anions (Sagi et al 1997) to keep ion balance. Previous studies have shown that to maintain pH stability, organic acid accumulation may be an important means for some plants, such as Aneurolepidium chinense (Shi and Wang 2005).…”

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confidence: 99%

Effect of increased alkalinity on Na<sup>+</sup> and K<sup>+</sup> contents, lipid peroxidation and antioxidative enzymes in two populations of Populus cathayana

Zhang

Xu³

et al. 2009

Biologia plant.

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We compared two populations of Populus cathayana Rehder, originating from altitudes 2 840 m and 1 450 m, to determine whether trees from different altitudes exhibit different tolerance to alkalinity. The tree cuttings were exposed to nutrient solutions with pH 7.9, 8.8, 9.8 and 10.4 and the salt concentration 200 mM. Na + and K + contents, and Na + /K + ratios in leaves and roots were greatly affected by pH values. At pH 10.4, the Na + /K + ratios in both leaves and roots sharply dropped in the higher altitude population but were maintained at higher levels in the lower altitude population. The patterns of pH-induced changes in contents of malondialdehyde and free proline, and antioxidative enzyme activities indicated that the higher altitude population exhibits greater tolerance to alkalinity stress than does the lower altitude population.Additional key words: free proline, malondialdehyde, poplar, salt-alkali mixed stress.

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Leaf gas exchange, water relations, nutrient content and growth in citrus and olive seedlings under salinity

Cited by 63 publications

References 36 publications

Spectral indices for the detection of salinity effects in melon plants

Spectral indices for the detection of salinity effects in melon plants

Assessment of the viability of using saline reclaimed water in grapefruit in medium to long term

Effect of increased alkalinity on Na<sup>+</sup> and K<sup>+</sup> contents, lipid peroxidation and antioxidative enzymes in two populations of Populus cathayana

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