Climate change and the ecophysiology of Bertholletia excelsa seedlings

Lorenzoni-Paschoa, Luciana de Souza; Amaral, Genilda Canuto; Pezzopane, José Eduardo Macedo; Abreu, Karla Maria Pedra de; Xavier, Talita Miranda Teixeira; Cuzzuol, Geraldo Rogério Faustini

doi:10.1007/s10725-022-00841-w

Cited by 2 publications

(2 citation statements)

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“…The reduction in the leaf gas exchange of cotton leaves was primarily limited by stomatal closure at the beginning of drought stress, which confirmed the plant economics hypothesis that the initial reduction in P n in response to drought deficit was normally associated with stomatal limitation [37], whereas biochemical or other limitations occurred as drought stress became more severe [38]. The net photosynthetic rate of cotton leaves entered a rapid degradation stage after 1 day of drought deficit, the Ci of the leaves decreased, and the constricted CO 2 supply was the main factor for the decline of the net photosynthetic rate.…”

Section: Effect Of Drought-rewatering On Photosynthesis and Chlorophy...supporting

confidence: 70%

Stem Hydraulic Conductance, Leaf Photosynthesis, and Carbon Metabolism Responses of Cotton to Short-Term Drought and Rewatering

Lai,

Zhang,

Liao

et al. 2023

Agronomy

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Water stress can trigger acclimation responses and damage plants. The aim of this study was to evaluate the integrative responses of cotton hydraulic conductance, leaf photosynthesis, and carbon metabolism to short-term drought and subsequent rewatering. A water-controlled pot experiment was conducted in 2020, with soil water drying continuing for one day (D1), two days (D2), and three days (D3) after it reached 40% ± 5% of the soil water holding capacity at the blooming stage of cotton, and the soil was then rewatered to the soil water holding capacity. We investigated how the stem hydraulic conductance, gas exchange, and biochemical traits of cotton were affected by imposed drought stress and subsequent rewatering. The hydraulic characteristics of cotton in the D2 and D3 treatments evolved with damage, complete closure of stomatal conductance, and complete deterioration of photosynthesis, in addition to severe floating changes in the carbon metabolism affected by drought. The leaves’ functional characteristics after rewatering cannot be completely recovered to full-irrigation levels, and the recovery extent was strongly linked to the duration. Consequently, it is considered desirable to maintain normal physiological activity during the cotton reproductive period, and the drought episode can be sustained for 1 day in a long-term perspective when the soil water content is depleted to 40% ± 5% of the soil water holding capacity. These results can provide in-depth ideas for better understanding the hydraulic and physiological responses of cotton to drought episodes and rewatering, and they can help drought-affected cotton to cope with future climate change.

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Section: Effect Of Drought-rewatering On Photosynthesis and Chlorophy...supporting

confidence: 70%

Stem Hydraulic Conductance, Leaf Photosynthesis, and Carbon Metabolism Responses of Cotton to Short-Term Drought and Rewatering

Lai,

Zhang,

Liao

et al. 2023

Agronomy

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“…However, because the reproductive success of Brazil nut is intrinsically linked to the interaction of climatic conditions, pollination dynamics and human activities, the limits of resilience to the increasing changes in forest climate are not fully understood. Recent study, for instance, indicates that climate change could impact positively B. excelsa but only when seedlings are irrigated pointing to the fact that water restriction in the dry season in the Amazon is a key limiting factor [21].…”

Section: Introductionmentioning

confidence: 99%

Threats and Sustainability of Brazil Nut (Bertholletia excelsa Bonpl.) Pre-Industrialization in the Amazon Region

Oliveira Brandão,

Arieira,

Afonso Nobre

2024

Sustainable Development

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Brazil nut (Bertholletia excelsa) is an important species in the Amazon, but the relationships between seed production and climate change are still poorly understood. Seed production data were obtained for the entire Brazilian Amazon, while data on precipitation, relative humidity, vapor pressure deficit, and temperature (mean and maximum) were collected to test their relationship with seed production in the Baixo Amazonas. Annual seed production in the Baixo Amazonas varied between 2156 and 10,235 tons per year from 1990 to 2021, with an average of 5192 tons per year. Linear regression analyses did not identify significant relationships between seed production and climatic variables during the same year (p > 0.05). However, significant relationships were found between the volume of seeds in the base year and climatic variables from 1 year before seed collection (p < 0.05), except for total precipitation (p = 0.15). Temperature was the main climatic variable affecting Brazil nut production, indicating that each 1°C increase in temperature is associated with an average decrease in seed volume ranging from 2595 to 2673 tons. Temperature measures explain between 38% and 42% of the variability in seed volume in the Baixo Amazonas. Therefore, it is crucial to mitigate global warming, invest in technological processes to add value to the remaining seeds, and adopt B. excelsa varieties more adapted to climate change.

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Climate change and the ecophysiology of Bertholletia excelsa seedlings

Cited by 2 publications

References 50 publications

Stem Hydraulic Conductance, Leaf Photosynthesis, and Carbon Metabolism Responses of Cotton to Short-Term Drought and Rewatering

Stem Hydraulic Conductance, Leaf Photosynthesis, and Carbon Metabolism Responses of Cotton to Short-Term Drought and Rewatering

Threats and Sustainability of Brazil Nut (Bertholletia excelsa Bonpl.) Pre-Industrialization in the Amazon Region

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