Anatomia comparada do pulvino primário de leguminosas com diferentes velocidades de movimento foliar

Rodrigues, Tatiane Maria; Machado, Sílvia Rodrigues

doi:10.1590/s0100-84042006000400020

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…The petiole is green, cylindrical, thin, with trichomes, has two stipules and two lanceolate stipels and pulvinus at the base (Figures 4D-E; Figures 5A-B). According to Rodrigues and Machado (2006), the presence of pulvinus is striking in the Fabaceae family.…”

Section: Resultsmentioning

confidence: 99%

Morphoanatomy of fruit, seed and seedling of Ormosia paraensis Ducke

Silva

Alves

et al. 2015

J. Seed Sci.

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-Ormosia paraensis Ducke, known as "tento", has seeds that are used to make handcrafts and wood that is worked on by furniture makers. For forest identification and seeds technology, the information about the morphoanatomy of their fruits, seeds and seedlings is scarce. Therefore, the purpose of this study was to morphoanatomically describe the fruit, seeds and the post-seminal development of "tento". For the morphoanatomical description, the evaluations were examined by optical and electron microscopy scanning. The fruit is a nutant legume, brown to black, dehiscent and with one or two seeds of lateral placentation, being the epicarp slim, the mesocarp woody and the endocarp spongy, measuring about 4.4 cm, 3.9 cm and 2.0 cm in length, width and thickness, respectively. The seeds are bitegmic, exalbuminous and rounded with average dimensions: length of 12.36 mm, width of 9.68 mm and thickness of 8.03 mm. The "tento" seedlings have simple and alternate leaves, with tap roots and cylindrical stem, being its germination hypogeal cryptocotyledonary.Index terms: morphology, post-seminal development, germination, Fabaceae.Morfoanatomia do fruto, da semente e da plântula de Ormosia paraensis Ducke ReSuMO -Ormosia paraensis Ducke, conhecida popularmente por tento, possui sementes ornamentais amplamente usadas na confecção de biojóias, assim como, sua madeira é usada na indústria moveleira. Para a identificação florestal e tecnologia de sementes, as informações sobre a morfoanatomia de seus frutos, sementes e plântulas são escassas. Desta forma, o objetivo no presente trabalho foi descrever morfoanatomicamente o fruto, a semente e a plântula de tento. Para a descrição morfoanatômica de tento, os frutos, as sementes e as plântulas foram avaliados por meio de microscopia óptica e eletrônica de varredura. O fruto de tento é um legume nucóide, pseudo-septado, castanho a preto, deiscente, portando uma ou duas sementes, de placentação lateral, sendo o epicarpo delgado, mesocarpo lenhoso e endocarpo esponjoso, medindo cerca de 4,4; 3,9 e 2,0 cm de comprimento, largura e espessura, respectivamente. As sementes são bitegumentadas, exalbuminosas, arredondadas, com dimensões médias: comprimento de 12,36 mm, largura de 9,68 mm e espessura de 8,03 mm. As plântulas de tento apresentam folhas simples e alternas, com raiz pivotante e caule cilíndrico, sendo a germinação do tipo hipógea criptocotiledonar.Termos para indexação: morfologia, desenvolvimento pós-seminal, germinação, Fabaceae.

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Section: Resultsmentioning

confidence: 99%

Morphoanatomy of fruit, seed and seedling of Ormosia paraensis Ducke

Silva

Alves

et al. 2015

J. Seed Sci.

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“…In the soybean, leaf paraheliotropism is induced with increasing irradiance (Jiang et al, 2006). For leguminous cerrado species, paraheliotropism may be a strategy to avoid excess sunlight interception at noon (Caldas et al, 1997;Rodrigues and Machado, 2006), 0098-8472/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.envexpbot.2010.10.012 which reinforces the photo-protective role of paraheliotropism.…”

Section: Introductionmentioning

confidence: 99%

Leaf paraheliotropism in Styrax camporum confers increased light use efficiency and advantageous photosynthetic responses rather than photoprotection

Habermann

Ellsworth

Cazoto

et al. 2011

Environmental and Experimental Botany

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Styrax caporum is a native shrub from the Brazilian savanna. Most of its leaves are diaheliotropic, whereas some are paraheliotropic, mainly at noon. A previous study of this species revealed higher stomatal conductance (gs) and transpiration rates (E) in para-compared to diaheliotropic leaves, and a rise in CO 2 assimilation rates (A) with an increase of irradiance for paraheliotropic leaves. We hypothesized that this species exploits the paraheliotropism to enhance the light use efficiency, and that it is detected only if gas exchange is measured with light interception by both leaf surfaces. Gas exchange was measured with devices that enabled light interception on only one of the leaf surfaces and with devices that enabled light interception by both leaf surfaces. Water relations, relative reflected light intensity, leaf temperature (T l), and leaf anatomical analyses were also performed. When both leaf surfaces were illuminated, a higher A, E, and gs were observed in para-compared to diaheliotropic leaves; however, A did not depend on gs, which did not influence CO 2 accumulation in the stomatal cavity (Ci). When only the adaxial leaf surface was illuminated, a greater A was detected for para-than for diaheliotropic leaves only at 11:00 h; no differences in T l were observed between leaf types. Light curves revealed that under non-saturating light the adaxial side of paraheliotropic leaves had higher A than the abaxial side, but they showed similar values under saturating light. Although the abaxial leaf side was highly reflective, both surfaces presented the same response pattern for green light reflection, which can be explained by the compact spongy parenchyma observed in the leaves, increasing light use efficiency in terms of CO 2 consumption for paraheliotropic leaves. We propose that paraheliotropism in S. camporum is not related to leaf heat avoidance or photoprotection.

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“…As in other savanna-type ecosystems, cerrado plants are subjected to high irradiance stress and respond with several general strategies (Oliveira and Marquis, 2002), including heliotropic leaf adjustments (Rodrigues and Machado, 2006). Heliotropism can be divided into two classes: (i) diaheliotropism, in which the leaf lamina become oriented at an angle perpendicular to incoming light; and (ii) paraheliotropism, where leaf lamina orient parallel to the light (Koller, 1986(Koller, , 1990Liu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Leaf heliotropism in Styrax camporum Pohl from the Brazilian cerrado: distinct gas exchange and leaf structure, but similar leaf temperature and water relations

Habermann

Machado

Guimarães

et al. 2008

Braz. J. Plant Physiol.

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Styrax camporum is a common shrub species from the cerrado regions of São Paulo State, Brazil. Although its leaves do not have a morphologically delimited pulvinus, the apical leaves are oriented parallel to the sun (paraheliotropic leaves), most notably around noon. Horizontal leaves at the base of shoots are oriented perpendicular to the sun's rays (diaheliotropic leaves). The ecophysiological significance of this is not fully understood. We investigated how paraheliotropism influences daily CO 2 assimilation (A) and other gas exchange rates, water relations, leaf temperature (T l ), and how these relate to leaf structure as assessed by anatomical leaf descriptions. Paraheliotropic leaves had greater A and stomatal conductance (g s ), which led to greater transpiration rates (E) during most of the day. However, no categorical data proved that these responses were responsible for the lower T l for vertical leaves, which only occurred at 1100 h and 1600 h. There was no indication that Tl influenced A, E, or g s . However, diaheliotropic leaves did not assimilate less carbon because of a smaller stomatal aperture. Both leaf types had satisfactory stomatal apertures and the same g s range, resulting in similar intercellular CO 2 levels. Paraheliotropic leaves had higher A rates under increased irradiance, suggesting an avoidance of excessive irradiance. Both leaf types had compact spongy parenchyma, representing an increased photosynthetic capacity per unit leaf area. Paraheliotropism in S. camporum does not seem to be related to leaf temperature control, even in the stressful Brazilian cerrado habitat. Key words: Brazilian savanna, ecophysiology, gas exchange, leaf movements, leaf temperature, photosynthesis, Styracaceae Heliotropismo foliar em Styrax camporum Pohl, uma espécie do cerrado brasileiro -padrões distintos de trocas gasosas e estrutura foliar, porém com temperatura foliar e relações hídricas similares: Styrax camporum é uma espécie arbustiva comum dos cerrados do Estado de São Paulo, Brasil. Embora suas folhas não tenham pulvino morfologicamente delimitado, as folhas apicais são orientadas paralelamente à incidência da radiação solar (folhas paraheliotrópicas), especialmente às 1200 h. Folhas horizontais estáticas das partes basais dos ramos são orientadas perpendicularmente aos raios solares (folhas diaheliotrópicas). O significado ecofisiológico do fenômeno não foi ainda completamente elucidado. Investigou-se como o paraheliotropismo influencia a assimilação diária de CO 2 (A) e outras taxas de trocas gasosas, relações hídricas, temperatura foliar (T f ) e suas relações com a estrutura da folha, avaliada por suas descrições anatômicas. Folhas paraheliotrópicas apresentaram maiores A e condutância estomática (g s ), o que levou à maior taxa de transpiração (E) durante grande parte do dia. Todavia, não houve dados categóricos assegurando que estas respostas tenham determinado menor T f para as folhas verticais, que ocorreu apenas às 1100 e 1600 h. Não houve nenhuma indicação de que T f influenciou A, ...

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Anatomia comparada do pulvino primário de leguminosas com diferentes velocidades de movimento foliar

Cited by 16 publications

References 30 publications

Morphoanatomy of fruit, seed and seedling of Ormosia paraensis Ducke

Morphoanatomy of fruit, seed and seedling of Ormosia paraensis Ducke

Leaf paraheliotropism in Styrax camporum confers increased light use efficiency and advantageous photosynthetic responses rather than photoprotection

Leaf heliotropism in Styrax camporum Pohl from the Brazilian cerrado: distinct gas exchange and leaf structure, but similar leaf temperature and water relations

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