Significance of C4 Leaf Structure at the Tissue and Cellular Levels

Taniguchi, Masaru

doi:10.1007/978-3-319-93594-2_9

Cited by 6 publications

(3 citation statements)

References 144 publications

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“…La anatomía foliar también está relacionada con el tipo de fotosíntesis que poseen las plantas, pudiendo ser fotosíntesis C3, C4 o CAM (Taniguchi & Cousins, 2018). En las Poaceae, las Panicoideae pertenecen al grupo de plantas con fotosíntesis C4, mientras que C3 se encuentran en las tribus Pooideae y Festucoideae.…”

Section: Mesofilounclassified

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

2023

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El macrosistema Iberá presenta diversos tipos de vegetación, donde además de las acuáticas y palustres hay bosques hidrófilos, sabanas con predominio de gramíneas y praderas con especies arbustivas intercaladas entre las herbáceas. Estudios previos de anatomía foliar solo fueron realizados en plantas acuáticas y palustres. En este trabajo se estudió la anatomía foliar en especies predominantes o frecuentes que crecen en pastizales y bosques del macrosistema Iberá, con el objetivo de detectar caracteres estructurales de las hojas que puedan representar valor adaptativo a estos ambientes. Se analizaron hojas de 42 especies correspondientes a 26 familias, con microscopía óptica y electrónica de barrido. Se realizó un análisis estadístico en base a una matriz de datos, compuesta por los caracteres anatómicos y el ambiente en que crecen las especies estudiadas. Los caracteres analizados de la epidermis fueron: diseño de la cutícula, estomas, tricomas, diseño de células epidérmicas de ambas epidermis, donde se observa un predominio de idéntica morfología en ambas caras. En el mesofilo se evaluó su tipo, presencia y forma de cristales de calcio e inulina, y distribución de estructuras glandulares como laticíferos, cavidades y células secretoras. Los datos reportados son discutidos en relación a la bibliografía disponible. El análisis de agrupamiento (UPGMA) muestra que las especies que habitan en los mismos ambientes no presentan características anatómicas similares.

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Section: Mesofilounclassified

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

2023

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“…Moreover, mesophyll chloroplasts redistribute toward the BS side of the mesophyll cells in response to environmental stresses such as drought, salinity, hyperosmosis, and strong sunlight, whereas BS chloroplasts hardly move under these stress conditions (Lal & Edwards 1996;Yamada et al 2009;Maai et al 2011b;Taniguchi & Cousins 2018;Maai et al 2020). The directional movement of C 4 mesophyll chloroplasts is referred to as 'aggregative movement' and is observed in many C 4 plant species (Yamada et al 2009;Kato et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Aggregative movement of C₄ mesophyll chloroplasts is promoted by low CO₂ under high intensity blue light

Kato

Taniguchi

2023

Plant Biol J

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C4 plants supply concentrated CO2 to bundle sheath (BS) cells, improving photosynthetic efficiency by suppressing photorespiration. Mesophyll chloroplasts in C4 plants are redistributed toward the sides of the BS cells (aggregative movement) in response to environmental stresses under light. Although this chloroplast movement is common in C4 plants, the significance and mechanisms underlying the aggregative movement remain unknown. Under environmental stresses, such as drought and salt, CO2 uptake from the atmosphere is suppressed by closing stomata to prevent water loss. We hypothesized that CO2 limitation may induce the chloroplast aggregative movement. In this study, the mesophyll chloroplast arrangement in a leaf of finger millet, an NAD‐malic enzyme type C4 plant, was examined under different CO2 concentrations and light conditions. CO2 limitation around the leaves promoted the aggregative movement, but the aggregative movement was not suppressed, even at the higher CO2 concentration than in the atmosphere, under high intensity blue light. In addition, mesophyll chloroplasts did not change their arrangement under darkness or red light. From these results, it can be concluded that CO2 limitation is not a direct inducer of the aggregative movement but would be a promoting factor of the movement under high intensity blue light.

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“…In C 4 plants, chloroplast movement following short term changes in light quality in maize was proposed to result in better coordination between CO 2 fixation in mesophyll and bundle sheath cells, and thus reduced Φ ( Sun et al , 2014 ). The aggregative movement is assumed to boost photosynthesis through improved light penetration or by shortening the diffusion path of metabolites and re-fixation of leakage CO 2 ( Taniguchi et al , 2003 ; Yamada et al , 2009 ; Maai et al , 2011 , 2020a ; Taniguchi and Cousins, 2018 ). However, it was found that the extent of aggregative movement did not differ for different bundle sheath chloroplast positions and for the presence or absence of a suberin lamella in bundle sheath cells, factors that may affect CO 2 leakage, its refixation and metabolite transport ( Kato et al , 2022 ).…”

Section: Introductionmentioning

confidence: 99%

The role of chloroplast movement in C4 photosynthesis: a theoretical analysis using a three-dimensional reaction–diffusion model for maize

Retta

Yin

et al. 2023

Journal of Experimental Botany

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Chloroplasts movement within mesophyll (M) cells in C4 plants is hypothesized to enhance the CO2 concentrating mechanism (CCM), but this is difficult to verify experimentally. A three-dimensional (3-D) leaf model can help analyze how chloroplast movement influences the operation of CCM. The first volumetric reaction-diffusion model of C4 photosynthesis that incorporates: detailed 3-D leaf anatomy, light propagation, ATP and NADPH production and CO2, O2 and bicarbonate concentration driven by diffusional and assimilation/emission processes, was developed and implemented for maize leaves to simulate various chloroplast movement scenarios within M cells : the movement of all M chloroplasts towards bundle-sheath (BS) cells (aggregative movement) and movement of only those of interveinal M cells towards BS cells (avoidance movement). Light absorbed by bundle-sheath (BS) chloroplasts relative to M chloroplasts increased in both cases. Avoidance movement decreased light absorption by M chloroplasts considerably. Consequently, total ATP and NADPH production and net photosynthesis rate increased for aggregative movement and decreased for avoidance movement case compared to the default case of no chloroplast movement at high light intensities. Leakiness increased in both chloroplast movement scenarios due to the imbalance in energy production and demand in M and BS cells. These results suggest the need to design strategies for coordinated increases in electron transport and Rubisco activities for an efficient CCM at very high light intensities.

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Significance of C4 Leaf Structure at the Tissue and Cellular Levels

Cited by 6 publications

References 144 publications

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

Aggregative movement of C₄ mesophyll chloroplasts is promoted by low CO₂ under high intensity blue light

The role of chloroplast movement in C4 photosynthesis: a theoretical analysis using a three-dimensional reaction–diffusion model for maize

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Significance of C4 Leaf Structure at the Tissue and Cellular Levels

Cited by 6 publications

References 144 publications

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

Anatomía foliar de especies predominantes en bosques y pastizales del Iberá

Aggregative movement of C4 mesophyll chloroplasts is promoted by low CO2 under high intensity blue light

The role of chloroplast movement in C4 photosynthesis: a theoretical analysis using a three-dimensional reaction–diffusion model for maize

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Aggregative movement of C₄ mesophyll chloroplasts is promoted by low CO₂ under high intensity blue light