Daily balance of leaf sugars and amino acids as indicators of common bean (Phaseolus vulgaris L.) metabolic response and drought intensity

Santos, Mariana; Pimentel, Carlos

doi:10.1007/s12298-009-0002-1

Cited by 20 publications

(20 citation statements)

References 22 publications

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“…The high leaf organic solutes content at 14:00 h verified in stressed plants is probably due to the high CO 2 assimilation rate in the morning with low VPD (Figure 3). These results are in agreement with Santos and Pimentel (2009), who showed a strong relation between carbohydrate and free amino acids under water deficit in bean plants.…”

Section: Resultssupporting

confidence: 93%

“…Carbohydrates are the main source of energy for the metabolic changes that occur during certain environmental stresses (SIVACI, 2006), though the accumulation of free amino acids is also common (SIRCELJ et al, 2007). Moreover, soluble sugar and amino acid contents act contrary to one another, as reported by Wingler et al (2006) for senescence, a factor induced by drought (HSIAO, 1973), and can be viewed as metabolic signals for physiological responses to drought (ROLLAND et al, 2006;PIMENTEL, 2009;SIRCELJ et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Tolerance to water deficit in young trees of jackfruit and sugar apple

Rodrigues¹,

Souza²,

Nogueira³

et al. 2010

Rev. Ciênc. Agron.

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-The predawn leaf water potential (Ψ l ), stomatal conductance (g s ), CO 2 assimilation (A), transpiration (E), chlorophyll a fluorescence and leaf metabolite contents (soluble sugars, proteins and free amino acids) of two tropical fruit species grown in a greenhouse were evaluated to determine the effect of induced water stress on young plants. Six month-old jackfruit (Artocarpus heterophyllus Lam.) and sugar apple (Annona squamosa L.) plants were evaluated in 10.0 L pots after eight days of water withholding, imposed by suspension of irrigation. Jackfruit water status was better than sugar apple. Sugar apple plants showed different daily stomatal behavior when well hydrated, compared to jackfruit plants under the same conditions. The gas exchange of both species showed sensibility to high vapor pressure deficit (VPD). However, under water deficit, photochemical efficiency dropped at midday in both treatments (control and water deficit) and both species showed low tolerance to high VPD and light intensity under greenhouse conditions. In contrast, some chlorophyll fluorescence variables showed good photosystem II stability at highest VPD hour (14:00 h). The present results involving carbohydrate metabolic changes revealed an accumulation of soluble sugars; moreover, protein and free amino acid contents in water stressed leaves also increased. These findings suggest an absence of damage to photosynthetic machinery for water deficit period. Jackfruit revealed greater tolerance to water deficit than sugar apple an important feature for commercial crops in northeastern Brazil. Key words -Annona squamosa. Artocarpus heterophyllus. Semi-arid. Tropical fruit. Water relations.Resumo -A condutância estomática (g s ), a assimilação de CO 2 (A), a transpiração (E), a fluorescência da clorofila e o conteúdo foliar de (açúcares solúveis, proteínas e aminoácidos livres) de duas espécies frutíferas tropicais foram avaliados para determinar o efeito do déficit hídrico induzido sobre as plantas da jaqueira (Artocarpus heterophyllus Lam.) e da pinheira (Annona squamosa L.) de seis meses de idade foram cultivadas em potes com capacidade para 10,0 L e foram avaliadas após oito dias de suspensão da irrigação. A jaqueira quando bem hidratada, foi melhor do que a pinheira. Plantas de pinheira apresentaram comportamento diferente quanto à condutância estomática diária quando comparada com as plantas de jaqueira, ambas bem hidratadas. As trocas gasosas de ambas as espécies apresentaram alta sensibilidade ao déficit pressão de vapor (DPV). No entanto, sob déficit hídrico, a eficiência fotoquímica decresceu ao meio-dia em ambos os tratamentos (controle e déficit hídrico) e ambas as espécies apresentaram baixa tolerância ao alto DPV e intensidade da luz em casa de vegetação. Em contrapartida, algumas variáveis de fluorescência de clorofila mostraram boa estabilidade na hora de maior DPV (14:00 h), indicando estabilidade do fotossistema II. Os resultados envolvendo alterações metabólicas revelaram um acúmulo de açúcares solúveis, ...

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Tolerance to water deficit in young trees of jackfruit and sugar apple

Rodrigues¹,

Souza²,

Nogueira³

et al. 2010

Rev. Ciênc. Agron.

Self Cite

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“…biochemical analysis: Leaves were always collected at 3 pm, the period of greatest accumulation of photoassimilates (Santos and Pimentel, 2009), the plant tissue was immediately wrapped with aluminum foil, then frozen in liquid nitrogen and stored at -80 o C freezer. Total soluble carbohydrates, total proteins, amino acids, malondialdehyde (MDA) and superoxide dismutase (SOD) activity were all analyzed according to the methodologies of Dubois et al (1956), Bradford (1976), Moore and Stein (1948), Cakmak and Horst (1991) and Giannopolitis and Reis (1997), respectively.…”

Section: Methodsmentioning

confidence: 99%

Water relations and some aspects of leaf metabolism of Jatropha curcas young plants under two water deficit levels and recovery

Arcoverde¹,

Rodrigues²,

Pompelli³

et al. 2011

Braz. J. Plant Physiol.

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Water relations and some aspects of leaf metabolism of Jatropha curcas young plants under two water deficit levels and recovery and 25% (severe stress), after rehydration were measured on the second and fourth day. Both mild and severe stress decreased g s and E; however, only severe stress reduced LCS, FAA and TP content and increased SOD activity (70%) and MDA content (60%) compared with the control. Moreover, under these conditions, the plants showed severe leaf senescence. These results show that only severe drought stress decrease foliar metabolism in potted plants.These results show that severe drought decreased metabolism and leaf RWC, in potted plants. However, 48 h under a moderate stress is enough to drive the stomatal control is the main barrier against water loss. Finally, in the fourth day after rehydration the plants under a moderate and severe drought even had a g s and E reduced in both evaluation periods.Key words: biodiesel, drought tolerance, MDA, oxidative stress, ROS, water deficit.

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“…About 3 g of fresh leaf samples were collected at day 23 (maximum stress) at 3 PM, considered the period of the day with the highest photoassimilate accumulation (Santos & Pimentel, 2009). The samples were immediately frozen in liquid nitrogen and stored at -20 °C.…”

Section: Methodsmentioning

confidence: 99%

Strategies of two tropical woody species to tolerate salt stress

et al. 2017

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This study aimed to evaluate the leaf primary metabolism in two woody species, Sterculia foetida and Bombacopsis glabra. Both species have seeds rich in oil and they are largely found in regions with irregularities in water availability. Seedlings were grown in a greenhouse from seeds. At 140 days after emergence, 50% of the plants were subjected to salt stress for 23 days, daily receiving 100 mM of NaCl solution. In both species, leaf stomata conductance and water potential decreased quickly under salt stress. The two species showed different strategies in photosynthetic pigment concentration and components of nitrogen metabolism. S. foetida kept the pigment concentration unchanged after 23 days of stress, while B. glabra increased concentration of chlorophyll a and carotenoids. S. foetida showed a high leaf concentration of K+ in stressed plants and a Na+/K+ ratio without differences when compared to control. Thus, S. foetida presented a better ionic balance, while B. glabra invested in photoprotection. Therefore, both species present potential to be planted in Brazilian Northeast, where water deficit and salt stress are challenging for annual crops.

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Daily balance of leaf sugars and amino acids as indicators of common bean (Phaseolus vulgaris L.) metabolic response and drought intensity

Cited by 20 publications

References 22 publications

Tolerance to water deficit in young trees of jackfruit and sugar apple

Tolerance to water deficit in young trees of jackfruit and sugar apple

Water relations and some aspects of leaf metabolism of Jatropha curcas young plants under two water deficit levels and recovery

Strategies of two tropical woody species to tolerate salt stress

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