Physiological Responses of Forest Trees to Heat and Drought

Rennenberg, Heinz; Loreto, Francesco; Polle, Andrea; Brilli, Federico; Fares, Silvano; Beniwal, R. S.; Geßler, Arthur

doi:10.1055/s-2006-924084

Cited by 415 publications

(331 citation statements)

References 130 publications

(134 reference statements)

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“…It has been suggested that fluctuations in temperature extremes and water deficit issue will be the key determinants of future climatic conditions. This fact has already been proved in the form of 2003 summer heat wave in Europe where an increase of 5°C above normal temperature was sustained throughout the summer period [23]. As compared to the other living organism plants being motionless have less chance to escape the stress conditions [24].…”

Section: Causes Of Climatic Variationsmentioning

confidence: 93%

Impacts of Heat Stress on Wheat: A Critical Review

Iqbal¹,

Raja²,

Yasmeen³

et al. 2017

Adv Crop Sci Tech

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A brief review is given of investigations on stress-induced alterations in the yield of different biochemical contents in wheat. Wheat is major cereal crop for fulfilling the calories demands of growing population. Alterations in the worldwide climate are predicted to have critical sentence for crop production. Abiotic stresses such as heat and drought are major abiotic stresses restraining crop production. Heat stress reduces wheat growth by upsetting various physiological and biochemical processes and the developmental stage of the plant is critical in demonstrating the vulnerability of various species and cultivars subjected to high temperature. Heat stress did not affect the protein content but there is strong correlation between leaf nitrogen content and grain protein content. Induction of HSPs seems to be the universal response and adaptation to temperature stress. The synthesis of HSPs is believed to play significant role either in preventing or minimizing the adverse effects of high temperature both at molecular and cellular levels. Wheat has the tendency to adopt diverse types of responses to temperature stress as well as a heat shock by developing thermo-tolerance for the enhancement of the grain quality and yield.

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Section: Causes Of Climatic Variationsmentioning

confidence: 93%

Impacts of Heat Stress on Wheat: A Critical Review

Iqbal¹,

Raja²,

Yasmeen³

et al. 2017

Adv Crop Sci Tech

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“…Mediterranean climate is well known for long lasting periods of drought during summer, with large irradiance loads and temperature maxima that may reach 40 to 45 • C. Such conditions impose strong stresses on leaves of tree species like oaks (Rennenberg et al, 2006). High temperatures above 40 • C, may under circumstances induce leaf necroses and yellowing (Schreiber and Berry, 1977).…”

Section: Introductionmentioning

confidence: 99%

Responses of photosynthesis to high temperatures in oak saplings assessed by chlorophyll-a fluorescence: inter-specific diversity and temperature-induced plasticity

et al. 2008

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-• The sensitivity of photosynthesis to high temperature was investigated in greenhouse-grown saplings of three Mediterranean (Quercus canariensis Willd., Q. coccifera L. and Q. suber L.) and two temperate European oak species (Q. robur L. and Q. petraea Matt. Liebl.). The sensitivity to high temperature was inferred from F 0 T curves producing the critical temperature (T c ) at which a rapid rise in ground chlorophyll a fluorescence (F 0 ) occurs. T c is known to acclimate to moderately increased ambient temperature by displaying significant increases.• We first checked whether acclimation of T c was paralleled by an increase in optimal temperature for light driven electron flux (T opt ,), recorded by measuring quantum yield of photochemistry under saturating CO 2 and moderate irradiance. Saplings of Q. suber and Q. canariensis were submitted to four, five days long ambient temperature steps (15, 25, 35 and 15 • C again). T c was usually largely above 45 • C while T opt was around 30-35 • C. Both increased with ambient temperature in the two species, and decreased again when temperature returned to the initial values. This recovery was nevertheless not complete after a week at 15 • C.• A second experiment tested whether the plasticity of T c was of the same extent in the five species. A significant increase of T c followed by a decrease was detected in all species. Only small inter-specific differences were detected in T c , and temperature induced plasticity was similar in the different species: T c increased by about 4-5 • C while ambient temperature was increased from 15 to 35 • C. Mediterranean and European oaks did not differ in this respect.• This result does not support the hypothesis that oak species from warmer regions would display a larger plasticity of T c in response to increasing temperatures.photochemistry / quantum yield / optimal temperature / Quercus suber / Quercus canariensis / Quercus coccifera / Quercus robur / Quercus petraea Résumé -Thermotolérance de la photosynthèse de chênes européens mesurée par la fluorescence de la chlorophylle : diversité interspécifique et plasticité induite par l'acclimatation thermique.• La sensibilité de la photosynthèse à des températures élevées a été étudiée chez cinq espèces de chênes : trois méditerranéennes (Quercus canariensis Willd., Q. coccifera L. et Q. suber L.) et deux tempérées (Q. robur L. et Q. petraea Matt. Liebl.). La sensibilité aux fortes températures était estimée suivant la procédure des courbes F 0 T par la température critique (T c ) au dessus de la quelle la fluorescence de base de la chlorophylle (F 0 ) augmente rapidement. T c présente une forte capacité d'acclimatation et augmente sensiblement après une élévation modérée de la température ambiante.• Dans une première expérimentation nous avons vérifié si une augmentation de T c s'accompagnait d'une augmentation de la température optimale du transfert d'électrons durant la photochimie (T opt ,), estimée par mesure du rendement quantique de la photochimie sous CO 2 saturant s...

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“…As plantas também podem se utilizar de estratégias de escape de perda de água excessiva a exemplo da abscisão foliar, a qual pode ser programada ou ser desencadeada pela própria condição de deficiência hídrica (DOSMANN et al, 1999). O aumento na espessura do mesofilo é uma estratégia que pode contribuir para evitar danos fotoxidativos, cuja suscetibilidade aumenta na condição de deficiência hídrica (RENNENBERG et al, 2006). O aprofundamento das raízes para manter a absorção de água suficiente para suprir a demanda da planta é outra estratégia importante para garantia de sobrevivência a longos períodos de estiagem .…”

Section: Introductionunclassified

ESTAQUIA E EFEITO DA DEFICIÊNCIA HÍDRICA OU INUNDAÇÃO SOBRE CARACTERÍSTICAS MORFOANATÔMICAS DE <i>Cestrum axillare</i> Vell.

Melo¹,

Melo²,

Davide³

et al. 2017

Ciênc. Florest.

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RESUMOO estudo do ecossistema de matas ciliares tem sido alvo de inúmeros trabalhos e pesquisas nos últimos anos. Porém, pelas condições microclimáticas dessas áreas, pouco se conhece a respeito das espécies com potencial para utilização em projetos de recuperação florestal, uma vez que, no mesmo local, pode haver condições de deficiência hídrica e inundações ao longo de um ano. Além disso, buscar alternativas para o plantio de mudas à beira de cursos d'água é essencial, uma vez que se trata de um ambiente muito propício à erosão, sendo o plantio por meio de estacas uma forma de evitar o revolvimento do solo. Assim, o objetivo deste trabalho foi avaliar o potencial de enraizamento de estacas caulinares de Cestrum axillare Vell. e sua plasticidade morfoanatômica em condições de deficiência hídrica ou inundação do sistema radicular, a fim de verificar sua potencialidade de utilização em projetos de recuperação de matas ciliares. Para isso, foram confeccionadas estacas a partir de ramos coletados de uma planta matriz, as quais foram distribuídas em diferentes classes de diâmetro, e colocadas em substrato para enraizar. Depois de enraizadas, as mudas foram cultivadas em vasos de 4000 cm³ de volume e, aos quatro meses de idade, submetidas aos tratamentos de deficiência hídrica ou inundação do sistema radicular. As avaliações foram realizadas ao longo de todo o estudo, desde observações visuais até a quantificação das alterações morfoanatômicas por meio da análise de lâminas histológicas. A partir dos resultados obtidos, verificou-se que Cestrum axillare pode ser propagada pela técnica de estaquia e é uma espécie indicada para ser utilizada em projetos de recuperação de matas ciliares. Palavras-chave: mata ciliar; raízes adventícias; lenticela; coerana. ABSTRACTThe ecosystem of riparian forests has been the subject of numerous studies and research in recent years. However, due to microclimate conditions in these areas, little is known about the species with potential for use in forest restoration projects, since in the same place, it may be conditions of low water availability and floods over a year. Also, the search for alternatives for the planting of seedlings in river borders is essential since it is an enabling environment to erosion, and planting by cuttings is a possibility because there is no need for soil disturbance. Thus, the objective of this study was to evaluate the potential of rooting of stem cuttings of Cestrum axillare Vell. and its morphological and anatomical plasticity in conditions of low availability of water or inundation of root system in order to verify its potential for use in restoration projects

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Physiological Responses of Forest Trees to Heat and Drought

Cited by 415 publications

References 130 publications

Impacts of Heat Stress on Wheat: A Critical Review

Impacts of Heat Stress on Wheat: A Critical Review

Responses of photosynthesis to high temperatures in oak saplings assessed by chlorophyll-a fluorescence: inter-specific diversity and temperature-induced plasticity

ESTAQUIA E EFEITO DA DEFICIÊNCIA HÍDRICA OU INUNDAÇÃO SOBRE CARACTERÍSTICAS MORFOANATÔMICAS DE <i>Cestrum axillare</i> Vell.

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