C4 photosynthesis and water stress

Ghannoum, Oula

doi:10.1093/aob/mcn093

Cited by 459 publications

(345 citation statements)

References 54 publications

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“…This suggested that C 4 plants have higher carbon sequestration under drought conditions. These results are consistent with previous research that C 4 plants have an advantages in Pn in drought conditions compared with C 3 plants [30,44,45] because the C 4 CO 2 -concentrating mechanism offers C 4 photosynthesis a greater buffering capacity against CO 2 shortages due to partial stomatal closure under water stress [46]. However, drought increased C 3 WUE overall, but tended to decrease C 4 WUE (Figure 1).…”

Section: Photosynthetic Pathwayssupporting

confidence: 92%

The Responses of Plant Leaf CO2/H2O Exchange and Water Use Efficiency to Drought: A Meta-Analysis

et al. 2018

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Persistent drought severely inhibits plant growth and productivity, which negatively affects terrestrial primary productivity worldwide. Therefore, it is important to investigate the impacts of drought on plant leaf CO 2 /H 2 O exchange and water use efficiency. This study assessed the responses of net photosynthesis (Pn), stomatal conductance (Gs), transpiration (Tr), and instantaneous water use efficiency (WUE) to drought based on a worldwide meta-analysis of 112 published studies. The results demonstrated that drought decreased Pn, Tr, and Gs significantly and differently among different moderators. C 4 plants had smaller Pn reduction than C 3 plants, which gives C 4 plants an advantage in Pn. But their WUE decreased under drought conditions, indicating a great flexibility in C 4 WUE. Annual herbs sacrificed WUE (−6.2%) to maintain efficient Pn. Perennial herbs took a different strategy in response to drought with an increased WUE (25.1%). Deciduous tree species displayed a greater increase in WUE than conifers and evergreen species. Additionally, Gs had a significant correlation with Pn and Tr, but an insignificant correlation with WUE, which could be because WUE is affected by other factors (e.g., air flow, CO 2 concentration, and relative humidity). These findings have significant implications for understanding the worldwide effects of drought on plant leaf CO 2 /H 2 O exchange and water use efficiency.

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Section: Photosynthetic Pathwayssupporting

confidence: 92%

The Responses of Plant Leaf CO2/H2O Exchange and Water Use Efficiency to Drought: A Meta-Analysis

et al. 2018

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“…Pode-se inferir que o aumento da produtividade de colmos (TCH), no manejo de cana irrigada por gotejamento (1.797 mm) em comparação com o manejo de cana de sequeiro (1.437 mm), foi causado pela diminuição do estresse hídrico tendo em vista que a ocorrência desse tipo de estresse provoca, segundo alguns autores, redução de trocas gasosas (Farquhar et al, 1989;Inman-Bamber & Smith, 2005); diminuição da área foliar e, consequentemente, do índice de área foliar (Inman-Bamber & Smith, 2005;Smit & Singels, 2006); redução no surgimento de novas folhas e aumento da abscisão foliar (Smit & Singels, 2006) em virtude da elevação da concentração de ácido abscísico na planta (Ghannoum, 2009), que é associado à quantidade de luz absorvida e à fotossíntese total da cana-deaçúcar (Irvine, 1975), reduzindo a produção de fotassimilados (Farquhar et al, 1989;Lopes et al, 1988). Essas características fisiomorfológicas modificadas pelo estresse hídrico são consideradas de grande importância para se obter elevadas produtividades vegetais (Inman-Bamber & Smith, 2005;Ghannoum, 2009).…”

Section: Resultsunclassified

“…Essas características fisiomorfológicas modificadas pelo estresse hídrico são consideradas de grande importância para se obter elevadas produtividades vegetais (Inman-Bamber & Smith, 2005;Ghannoum, 2009). Para as condições de campo deste experimento, a cana-deaçúcar necessitou, em média, de 14,2 mm de água para produzir uma tonelada de colmos (EUA-TCH), (Tabela 1); resultado semelhante a este foi verificado por Foligata (1974) O incremento da produtividade de açúcar (TPH) ocorreu devido ao maior acúmulo de biomassa pela cultura, no manejo Tabela 1.…”

Section: Resultsunclassified

Produtividade de três cultivares de cana-de-açúcar sob manejos de sequeiro e irrigado por gotejamento

Gava¹,

Silva²,

Silva

et al. 2011

Rev. bras. eng. agríc. ambient.

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ciclo teve duração de 336 dias, ocorrendo precipitação de 1.480 mm. O volume de água disponibilizado pelo sistema de irrigação por gotejamento foi de 400 mm, totalizando 1.880 mm. O segundo ciclo teve duração de 365 dias, cujo volume de água por meio de precipitação foi de 1.394 mm; somados aos 320 mm fornecidos pelo sistema de irrigação, totalizaram 1.714 mm. Ocorreu interação entre manejo e cultivar para as variáveis: produtividade de colmos (TCH) e produtividade de açúcar (TPH) em que a maior diferença foi observada para a cultivar SP80-3280. As cultivares apresentaram respostas diferenciadas na eficiência de utilização da água. No manejo irrigado por gotejamento houve elevação de 24% na produtividade de colmos e de 23% na produtividade de açúcar, em relação ao manejo de sequeiro.Palavras-chave: Saccharum spp., disponibilidade hídrica, irrigação, produção Productivity of three sugarcane cultivars under dry and drip irrigated management ABSTRACT This study aimed to evaluate the effect of drip irrigation technology in different sugarcane varieties in two crop cycles (plant cane and ratoon). The experimental design was in completly randomized blocks, in split-plot with four replications, constituted by three sugarcane genotypes: RB867515; RB855536 and SP80-3280 and two crop management: drip irrigation system and rainfed system, totalizing six treatments. The first cycle lasted for 336 days, with rainfall of 1,480 mm. The volume of water provided by the system of drip irrigation was 400 mm, totaling 1,880 mm. The second cycle lasted for 365 days, the volume of water through rainfall was 1,394 mm, added to 320 mm provided by the system of irrigation, totaled 1,714 mm. Interaction between management and cultivars was found significant for the variables: productivity of stalks (TCH) and sugar yield (TPH), in which the largest difference was observed for cultivar SP80-3280. There was significant response to drip irrigation, on average the increase of production of stalks and sugar was 24 and 23%, respectively.

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“…Studies concerning the effect of water stress on the photosynthesis by C 4 plants are fewer than for C 3 (Ghannoum 2009), despite their ecological, social and economic relevance. C 4 plants evolved 50-60 million years ago (Jacobs et al 1999;Kellogg 2001) when temperatures were higher by 8-10 ºC and the concentration of CO 2 in the atmosphere was lower than at present.…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis by six Portuguese maize cultivars during drought stress and recovery

2010

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Photosynthesis, chlorophyll fluorescence and leaf water parameters were measured in six Portuguese maize (Zea mays L.) cultivars during and following a period of drought stress. The leaf relative water content (RWC) responded differently among cultivars but, except for cultivar PB369, recovered close to initial values after watering was restored.Photosynthetic rate and stomatal conductance decreased with drought but more slowly in cultivars PB269 and PB260 than in cultivars AD3R, PB64, PB304 and PB369. Water use efficiency (WUE) decreased during the water stress treatment although with cultivar PB260 the decrease was marked only when the RWC fell below 40%. Recovery of WUE was seen with all cultivars except PB369. The maximum quantum efficiency of photosystem II, the photochemical quenching coefficient, the electron transport rate in PSII and the estimated functional plastoquinone pool tended to decrease with drought, while the non-photochemical quenching coefficient increased. The parameters estimated from chlorophyll fluorescence did not recover in PB369, during re-watering. The results show that PB260 and PB269 were the most tolerant and PB369 was the least tolerant cultivars to water stress. The variation found amongst the cultivars tested suggests the existence of valuable genetic resources for crop improvement in relation to drought tolerance.Keywords: maize, drought, recovery, Chl a fluorescence, gas-exchange Abbreviations: A, photosynthetic rate; C i , intercellular CO 2 partial pressure; Chl, chlorophyll; d.f., degrees of freedom; E, transpiration rate; ETR, electron transport rate on PSII; F v /F m , maximum quantum efficiency of PSII; g s , stomatal conductance; IRGA, infrared gas analysis; PPFD, photosynthetic photon flux density; PSI (II), photosystem I (II); PQ, plastoquinone; qN, non-photochemical quenching coefficient; qP, photochemical quenching coefficient; RH, relative humidity; RWC, leaf relative water content; S m , estimated functional plastoquinone pool; WUE, water use efficiency.

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C4 photosynthesis and water stress

Cited by 459 publications

References 54 publications

The Responses of Plant Leaf CO2/H2O Exchange and Water Use Efficiency to Drought: A Meta-Analysis

The Responses of Plant Leaf CO2/H2O Exchange and Water Use Efficiency to Drought: A Meta-Analysis

Produtividade de três cultivares de cana-de-açúcar sob manejos de sequeiro e irrigado por gotejamento

Photosynthesis by six Portuguese maize cultivars during drought stress and recovery

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