EFFECT OF WATER SHORTAGE ON PHOTOSYNTHESIS, GROWTH AND STORAGE CARBOHYDRATE ACCUMULATION IN WALNUT (Juglans regia L.).

Scartazza, Andrea; Proietti, Simona; Moscatello, Stefano; Augusti, Angela; Monteverdi, María Cristina; Brugnoli, Enrico; Battistelli, Alberto

doi:10.17660/actahortic.2001.544.30

Cited by 12 publications

(8 citation statements)

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“…Galvez et al (2011) found a drought-induced increase of root carbohydrate reserves in aspen seedlings, while Piper (2011) showed that drought-induced mobilization of C storage in two evergreen Nothofagus species is affected by drought intensity and by drought resistance of the species, with a decrease of NSC content in the more drought-susceptible species and an increase in the relatively more drought-resistant ones. It has been demonstrated in several deciduous species that reserves are mobilized at bud break to sustain spring growth (e.g., Gregory andWargo 1986, Wong et al 2003) and that a severe drought period affecting reserve accumulation and partitioning may also influence phenology and spring growth rate in the subsequent year (Scartazza et al 2001, Bréda et al 2006. Reserves are also mobilized during winter in deciduous species for acclimation to low temperatures, development and maintenance of cold tolerance and cellular respiration (e.g., Ögren 2000Ögren , Barbaroux et al 2003.…”

Section: Research Papermentioning

confidence: 99%

Seasonal and inter-annual dynamics of growth, non-structural carbohydrates and C stable isotopes in a Mediterranean beech forest

et al. 2013

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Seasonal and inter-annual dynamics of growth, non-structural carbohydrates (NSC) and carbon isotope composition (δ(13)C) of NSC were studied in a beech forest of Central Italy over a 2-year period characterized by different environmental conditions. The net C assimilated by forest trees was mainly used to sustain growth early in the season and to accumulate storage carbohydrates in trunk and root wood in the later part of the season, before leaf shedding. Growth and NSC concentration dynamics were only slightly affected by the reduced soil water content (SWC) during the drier year. Conversely, the carbon isotope analysis on NSC revealed seasonal and inter-annual variations of photosynthetic and post-carboxylation fractionation processes, with a significant increase in δ(13)C of wood and leaf soluble sugars in the drier summer year than in the wetter one. The highly significant correlation between δ(13)C of leaf soluble sugars and SWC suggests a decrease of the canopy C isotope discrimination and, hence, an increased water-use efficiency with decreasing soil water availability. This may be a relevant trait for maintaining an acceptable plant water status and a relatively high C sink capacity during dry seasonal periods. Our results suggest a short- to medium-term homeostatic response of the Collelongo beech stand to variations in water availability and solar radiation, indicating that this Mediterranean forest was able to adjust carbon-water balance in order to prevent C depletion and to sustain plant growth and reserve accumulation during relatively dry seasons.

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Section: Research Papermentioning

confidence: 99%

Seasonal and inter-annual dynamics of growth, non-structural carbohydrates and C stable isotopes in a Mediterranean beech forest

et al. 2013

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“…According to literature, there were many studies on walnuts, such as walnut flowering (Hassankhah et al 2018), bud dormancy (Gholizadeh et al 2017), ex vitro acclimation of walnut plantlets (Maleki Asayesh et al 2017a,b), etc. Previous studies showed that photosynthesis of walnut leaves was affected by many factors, including kaolin (Rosati et al 2007, Gharaghani et al 2018, rootstock varieties (Li et al 2017), fertilizers (Nicodemus et al 2008, Liu et al 2010), acclimation (Chenevard et al 1997, light (Dean et al 1982, Atanasova et al 2003, salinity (Zhang et al 2002), and water (Scartazza et al 2001). Despite previous studies reporting photosynthetic response to changes in source-sink relationships, a systematic research on long-term response of photosynthesis and physiological characteristics of walnut leaves under different source-sink relationship is very limited , Moscatello et al 2017.…”

Section: Introductionmentioning

confidence: 99%

The long-term response of photosynthesis in walnut (Juglans regia L.) leaf to a leaf-to-fruit ratio

Zhang¹,

Pan²,

Chen³

2019

Photosynt.

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For clarifying the relationship between a leaf-to-fruit ratio (LFR) and photosynthesis, LFR manipulation was performed with Juglans regia cv. Xinxin2 in order to test the photosynthesis response to LFR in source leaves. Results showed that LFR with one and two leaves was positively correlated with net photosynthetic rate (PN), chlorophyll content, and specific leaf mass, implying extremely low LFR inhibited the leaf development. However, LFR with five leaves was negatively correlated with PN, positively correlated with starch, but not related to intercellular CO2 concentration, indicating the high LFR caused the nonstomatal limitation and feedback inhibition of photosynthetic production. No significant differences in PN between LFRs (with three and four leaves) probably indicated a balanced state of coordinated supply and demand between the source leaf and sink fruit. The above results indicated that the response of photosynthesis in the source leaves to LFR depends on the variation range of LFR.Additional key words: gas exchange; leaf anatomical structure; leaf traits; nut; source-sink relationship. CO2 concentration; DAF -days after full bloom of female flowers; gs -stomatal conductance; FL -LFRs with five leaves; LFR -leaf-to-fruit ratio; LT -leaf thickness; OTL -LFRs with one and two leaves; PN -net photosynthetic rate; PN-PAR -photosynthetic rate response to PAR; PTT -palisade tissue thickness; SLM -specific leaf mass; Sta -starch; STT -spongy tissue thickness; TFL -LFRs with three and four leaves; TSS -total soluble sugar.

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“…There is a straight inverse relationship between stress treatment and most of the vegetative growth and visual parameters (leaf area, leaf necrotic area, dry weight of different parts of the plant, shoot diameter, etc.) [6,7]. Different species have different ways of adapting to drought [8].…”

Section: Introductionmentioning

confidence: 99%

Soluble sugars and proline accumulation play a role as effective indices for drought tolerance screening in Persian walnut (Juglans regiaL.) during germination

Lotfi¹,

Vahdati²,

Kholdebarin³

et al. 2010

Fruits

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Soluble sugars and proline accumulation play a role as effective indices for drought tolerance screening in Persian walnut (Juglans regia L.) during germination. Abstract-Introduction. Drought stress is the major factor affecting growth, development and production of walnut trees. In Iran, approximately 33 Mha of land is affected by salinization and drought stress. Finding genetic resources tolerant to drought stress at different growth stages is important for such semi-arid regions. Our aim was to understand better the adaptive mechanisms that enable different genotypes of walnut population to survive under drought stress, and to provide some useful clues for walnut tree breeding toward improved drought tolerance with utilization of existing droughttolerant genetic resources. Materials and methods. To study the mechanism(s) involved in drought tolerance of some Persian walnut genotypes, drought stress was induced using polyethylene glycol-6000 to produce water potentials of 0 Mpa (control),-0.10 MPa,-0.50 MPa,-0.75 MPa,-1.00 MPa,-1.50 MPa and-2.00 MPa. The amount of proline and soluble sugar accumulation in four walnut genotypes ('Panegine 20 ', 'Lara', 'Serr' and 'Chandler') were determined after being exposed to the various water potential levels. Results. The rates of seed germination in all genotypes were significantly reduced by low external water potentials. Plants exposed to water stress had a higher amount of soluble sugars in roots and shoots of tolerant genotypes ('Panegine 20 ' and 'Chandler') and a lower amount of starch in their tissues. These results imply the important roles of soluble sugars as solutes conferring resistance to drought in these genotypes. The free proline levels were also increased in response to drought stress. They were higher in drought-tolerant genotypes than in sensitive ones ('Lara' and 'Serr'). Proline increased more in shoots than in roots. However, the soluble sugar and starch fluctuations were higher in the roots. Conclusion. Our results support a direct correlation between the degree of drought stress and proline content. As a consequence, proline concentrations could be used as a biochemical marker of drought stress level in walnut plants. Iran Islamic Republic / Juglans regia / genetic resources / drought stress / seedlings / sugars / proline Les sucres solubles et l'accumulation de proline sont des indicateurs efficaces pour la sélection de noyers persans (Juglans regia L.) tolérants à la sécheresse pendant la germination. Résumé-Introduction. Le stress dû à la sécheresse est le principal facteur influant sur la croissance, le développement et la production de noyers. En Iran, environ 33 Mha de terres sont affectées par la salinisation et la sécheresse. Trouver des ressources génétiques tolérantes à la sécheresse à différents stades de croissance est important pour ces régions semi-arides. Notre objectif a été de mieux comprendre les mécanismes adaptatifs qui permettent aux différents génotypes de noyers de survivre en conditions de stress hydrique et de fournir quel...

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EFFECT OF WATER SHORTAGE ON PHOTOSYNTHESIS, GROWTH AND STORAGE CARBOHYDRATE ACCUMULATION IN WALNUT (Juglans regia L.).

Cited by 12 publications

References 0 publications

Seasonal and inter-annual dynamics of growth, non-structural carbohydrates and C stable isotopes in a Mediterranean beech forest

Seasonal and inter-annual dynamics of growth, non-structural carbohydrates and C stable isotopes in a Mediterranean beech forest

The long-term response of photosynthesis in walnut (Juglans regia L.) leaf to a leaf-to-fruit ratio

Soluble sugars and proline accumulation play a role as effective indices for drought tolerance screening in Persian walnut (Juglans regiaL.) during germination

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