Heat tolerance of Portuguese old bread wheat varieties

Campos, Paula Scotti; Semedo, José N.; Pais, Isabel P.; Oliveira, M.; Passarinho, J. A.; Ramalho, José C.

doi:10.9755/ejfa.v26i2.16761

Cited by 13 publications

(20 citation statements)

References 33 publications

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“…Under stress conditions, they undergo modifications which either enable them to acclimate to the new environment or lead to irreversible injury and cell death (Kuiper, 1985;Harwood, 1998).Qualitative and quantitative changes of membrane lipids have been involved in adaptation to many abiotic stresses, such as cold (Partelli et al, 2011;Scotti-Campos et al, 2014a), heat (Scotti-Campos et al, 2014b), aluminium toxicity (Huynh et al, 2012) and drought Matos et al, 2010;Scotti-Campos et al, 2013), among others.…”

Section: Introductionmentioning

confidence: 99%

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

Campos

Pham-Thi

2016

Emir. J. Food Agric

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Section: Introductionmentioning

confidence: 99%

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

Campos

Pham-Thi

2016

Emir. J. Food Agric

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“…Membrane injury has been widely used as an indicator of protoplasmic tolerance to abiotic stresses (Matos et al, 2002;Scotti-Campos et al, 2011). Raises in electrolyte leakage are usually related to irreversible membrane damage and the occurrence of membrane lipoperoxidative processes that lead to cell decompartmentation and tissues senescence (Lauriano et al, 2000;Scotti-Campos et al, 2014). Such losses of membrane integrity may also reflect damages occurring at chloroplast level, resulting in photosynthetic activity impairment (Matos et al, 2010;Scotti Campos et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…Water shortage causes oxidative stress to the cells through reactive oxygen species formation, which result in damaged cellular structures (Blum and Ebercon, 1981), leading to cell decompartmentation and death. Membrane injury can be evaluated through increased electrolyte leakage (Campos and Pham Thi, 1997;Matos et al, 2002;Campos et al, 2003;Dias et al, 2010;Farooq et al, 2011;Scotti Campos et al, 2014). Plant reproductive development is extremely sensitive to abiotic stresses, so that any environmental perturbations may strongly affect final yield and quality (Dupont and Altenbach, 2003;Prasad et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to drought in four developed Triticum aestivum groups

Campos

Semedo

Pais

et al. 2015

Emir. J. Food Agric

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Restricted water availability and yield reductions derived from climate changes have become a strong concern as regards fundamental crops, such as wheat. There is an increasing need to characterize germplasm diversity in order to highlight drought tolerant genotypes and to assist Portuguese wheat breeding programs. Bread wheat (Triticum aestivum) varieties were selected from four different evolutive and/or breeding groups: ancient landraces, traditional varieties, modern currently used and advanced lines. The aim of this work was to identify physiological traits that contribute to drought tolerance during grain filling period. Plants were cultivated in pots, under semi-controlled greenhouse conditions. Drought was imposed by withholding irrigation after anthesis. Well irrigated and water stressed plants were compared as regards leaf gas exchanges (net photosynthetic rate, Pn; leaf stomatal conductance, gs; transpiration, E), instantaneous water use efficiency (iWUE), membrane electrolyte leakage, osmotic potential and leaf pigments. Subsequently, plants were maintained under a controlled irrigation (droughted plants: 50% of the water given to fully irrigated controls) until harvest, to quantify yield. Pn and gs were significantly reduced by drought in all varieties. As regards membrane integrity ancient and traditional varieties presented lower membrane injury, what may reflect a higher protoplasmic tolerance to drought. More evolved varieties (modern and advanced) showed higher spike weight per plant and number of grains per spike, disregard the water regime. Under water deficit 1000 kernel weight was reduced in all varieties except in traditional Pirana, which also showed an increase in the number of spikes per plant. Higher membrane stability, increased pigments and lower osmotic potential under drought may underly such improved response to drought, pointing this variety as an interesting genetic resource for breeding purposes.

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“…High temperature was found to be involved in causing higher PPO activity in leaf and the effects were more pronounced after 24 h of exposure although gradual increase in activity up to 72 h of periods was noted. It has been demonstrated that high temperature causes the higher oxidative stress inducing the synthesis of reactive oxygen species (ROS) (Mahajan and Tuteja, 2005) and increases tolerance to ROS in plants and with an increase in anti-oxidative enzymes (Scotti-Campos et al, 2014). Anti-oxidative enzymes can neutralize ROS and thereby prevents the cellular membranes and organelles from the damaging effects of ROS.…”

Section: Discussionmentioning

confidence: 99%

Regulatory mechanism of enhancing polyphenol oxidase activity in leaf of Basella alba induced by high temperature stress

Siddika

Rakib

Zubair

et al. 2015

Emir. J. Food Agric

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High temperature is recognized to be a major abiotic stress involved in diverse metabolic regulation in plants. However, the regulatory mechanism of high temperature induced polyphenol oxidase (PPO) activity in Basella alba is not clarified. B. alba plants grown in pots were exposed to 45°C for 24, 48 and 72 h periods and the control plants were kept at 30°C. The PPO activity in leaves of plants was up regulated and the effects were more pronounced at 24h of treatment. To clarify the regulatory mechanism of enhancing the effect, plants were treated with 10 mM Na 2 HAsO 4 and exposed to 45ºC for the above mentioned periods. Na 2 HAsO4 along with high temperature causes similar stimulatory effects of PPO activity when compared to respective control. Therefore, both high temperature and arsenic treatment may cause additive stresses and enhance the PPO activity. To further clarify the mechanism of high temperature induced PPO activity, plants were treated with 1 mM Nifedipine, a recognized calcium channel blocker and exposed to 45ºC. Treatment with blocker effectively prevented the activity induced by high temperature almost to the control level which shows clearly that high temperature-induced activity is mediated through calcium channel and may affect cellular concentration of calcium. The results suggests that increased PPO activity might be due to oxidative stress and that arsenic and calcium play a critical role in this phenomenon, thereby the plants survive in adverse environment.

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Heat tolerance of Portuguese old bread wheat varieties

Cited by 13 publications

References 33 publications

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

Physiological responses to drought in four developed Triticum aestivum groups

Regulatory mechanism of enhancing polyphenol oxidase activity in leaf of Basella alba induced by high temperature stress

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