12
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      ESTAQUIA E EFEITO DA DEFICIÊNCIA HÍDRICA OU INUNDAÇÃO SOBRE CARACTERÍSTICAS MORFOANATÔMICAS DE Cestrum axillare Vell. Translated title: CUTTING AND EFFECT OF THE WATER DEFICIT OR FLOODING ON MORPHOANATOMIC CHARACTERISTICS OF Cestrum axillare Vell.

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          RESUMO O estudo do ecossistema de matas ciliares tem sido alvo de inúmeros trabalhos e pesquisas nos últimos anos. Porém, pelas condições microclimáticas dessas áreas, pouco se conhece a respeito das espécies com potencial para utilização em projetos de recuperação florestal, uma vez que, no mesmo local, pode haver condições de deficiência hídrica e inundações ao longo de um ano. Além disso, buscar alternativas para o plantio de mudas à beira de cursos d'água é essencial, uma vez que se trata de um ambiente muito propício à erosão, sendo o plantio por meio de estacas uma forma de evitar o revolvimento do solo. Assim, o objetivo deste trabalho foi avaliar o potencial de enraizamento de estacas caulinares de Cestrum axillare Vell. e sua plasticidade morfoanatômica em condições de deficiência hídrica ou inundação do sistema radicular, a fim de verificar sua potencialidade de utilização em projetos de recuperação de matas ciliares. Para isso, foram confeccionadas estacas a partir de ramos coletados de uma planta matriz, as quais foram distribuídas em diferentes classes de diâmetro, e colocadas em substrato para enraizar. Depois de enraizadas, as mudas foram cultivadas em vasos de 4000 cm³ de volume e, aos quatro meses de idade, submetidas aos tratamentos de deficiência hídrica ou inundação do sistema radicular. As avaliações foram realizadas ao longo de todo o estudo, desde observações visuais até a quantificação das alterações morfoanatômicas por meio da análise de lâminas histológicas. A partir dos resultados obtidos, verificou-se que Cestrum axillare pode ser propagada pela técnica de estaquia e é uma espécie indicada para ser utilizada em projetos de recuperação de matas ciliares.

          Translated abstract

          ABSTRACT The ecosystem of riparian forests has been the subject of numerous studies and research in recent years. However, due to microclimate conditions in these areas, little is known about the species with potential for use in forest restoration projects, since in the same place, it may be conditions of low water availability and floods over a year. Also, the search for alternatives for the planting of seedlings in river borders is essential since it is an enabling environment to erosion, and planting by cuttings is a possibility because there is no need for soil disturbance. Thus, the objective of this study was to evaluate the potential of rooting of stem cuttings of Cestrum axillare Vell. and its morphological and anatomical plasticity in conditions of low availability of water or inundation of root system in order to verify its potential for use in restoration projects in riparian environments. For that, cuttings were made from a matrix plant in different diameter classes and placed to root. After rooted, the plantlets were planted in containers of 4000 cm³ and at four months of age, subjected to low availability of water or flooding of root system. Evaluations were conducted throughout the study, covering visual observation and quantification of morphological and anatomical changes through histological sections. From the results, it was found that Cestrum axillare has potential to be propagated by cutting technique and it is indicated for use in restoration of riparian forest projects.

          Related collections

          Most cited references47

          • Record: found
          • Abstract: found
          • Article: not found

          Physiological responses of forest trees to heat and drought.

          The heat wave of summer 2003 was the largest and the most persistent ever experienced in Central Europe and has fuelled concern about the effects of climate change on European ecosystems. Since forests constitute the most important European ecosystems, in this review article we assess current knowledge on the effects of heat and drought on key metabolic processes for growth and productivity of forest trees. In particular, the general consequences of heat and drought on (1) photosynthesis and respiration at the cellular and community level, and (2) on nutrient uptake, partitioning and competition for nutrients are summarized. The latter are a major sink for photosynthetic energy and, therefore, are indirectly but strongly connected to the performance of photosynthesis. In addition, the interaction of heat and drought with stress compensation mechanisms and emission of biogenic volatile organic compounds (BVOC) are discussed, since these processes are directly connected to carbon metabolism. Effects on the emission of BVOC are also included because they constitute an important feedback mechanism on ozone formation and, thus, on atmospheric pollution. As far as available, data collected during the 2003 heat wave are included and discussed.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            The ascorbic acid redox state controls guard cell signaling and stomatal movement.

            H(2)O(2) serves an important stress signaling function and promotes stomatal closure, whereas ascorbic acid (Asc) is the major antioxidant that scavenges H(2)O(2). Dehydroascorbate reductase (DHAR) catalyzes the reduction of dehydroascorbate (oxidized ascorbate) to Asc and thus contributes to the regulation of the Asc redox state. In this study, we observed that the level of H(2)O(2) and the Asc redox state in guard cells and whole leaves are diurnally regulated such that the former increases during the afternoon, whereas the latter decreases. Plants with an increased guard cell Asc redox state were generated by increasing DHAR expression, and these exhibited a reduction in the level of guard cell H(2)O(2). In addition, a higher percentage of open stomata, an increase in total open stomatal area, increased stomatal conductance, and increased transpiration were observed. Guard cells with an increase in Asc redox state were less responsive to H(2)O(2) or abscisic acid signaling, and the plants exhibited greater water loss under drought conditions, whereas suppressing DHAR expression conferred increased drought tolerance. Our analyses suggest that DHAR serves to maintain a basal level of Asc recycling in guard cells that is insufficient to scavenge the high rate of H(2)O(2) produced in the afternoon, thus resulting in stomatal closure.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Morphological and physiological adjustments to waterlogging and drought in seedlings of Amazonian floodplain trees

              Plants in central Amazonian floodplains are subjected to waterlogging or complete submersion for 50-270 days every year. Most trees have growth reductions, photosynthetic activity can be reduced for some weeks to months, and leaf fall increases during the high-water period, but leaf flush, flowering and fruiting also occur in waterlogged plants. Whether flooding can trigger the changes in phenology, growth and metabolism of the plants has not yet been established. The aim of this study was to analyse the extent to which waterlogging was directly responsible for morphological, phenological and physiological changes in floodplain seedlings. In two flooding experiments performed at different times of the year, the effects of waterlogging, submersion and drought were tested in seedlings of six species with different growth strategies. One experiment was performed in the period of highest precipitation and rising river levels, and a second experiment in the period of highest river levels and the onset of the period of lowest precipitation. All results were comparable in the two experiments, and the morphological, phenological and physiological responses were linked to the treatments. Height growth and new leaf production were not severely affected in the waterlogged seedlings. All waterlogged plants produced adventitious roots, lenticels and stem hypertrophy. Submersion and drought caused a state of rest, but soon after the water had receded, leaves resprouted. Five to 12 weeks after the end of submersion, the seedlings reached the height of the control plants, showing a high ability to compensate the period of rest induced by submergence. Only the three deciduous species subjected to waterlogging showed a different phenological behaviour in the two experiments, perhaps related to genetically fixed phenological rhythms which are synchronous to those of adult trees in the field.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                cflo
                Ciência Florestal
                Ciênc. Florest.
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-9954
                1980-5098
                March 2017
                : 27
                : 1
                : 325-337
                Affiliations
                [1] Lavras Minas Gerais orgnameUniversidade Federal de Lavras orgdiv1Departamento de Ciências Florestais Brazil lucas.amaral@ 123456dcf.ufla.br
                [3] Lavras Minas Gerais orgnameUniversidade Federal de Lavras orgdiv1Departamento de Ciências Florestais Brazil acdavide@ 123456dcf.ufla.br
                [4] Lavras Minas Gerais orgnameUniversidade Federal de Lavras orgdiv1Departamento de Biologia Brazil emcastro@ 123456dbi.ufla.br
                [2] Goiânia Goiás orgnameUniversidade Federal de Goiás orgdiv1Instituto de Ciências Biológicas Brazil hyrandir@ 123456yahoo.com.br
                [5] Lavras Minas Gerais orgnameUniversidade Federal de Lavras orgdiv1Programa de Pós-graduação em Engenharia Florestal Brazil juliano_engflorestal@ 123456yahoo.com.br
                Article
                S1980-50982017000100325
                10.5902/1980509826471
                b4e8cb3f-53fc-4f49-b161-ed83cc78ecae

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 20 May 2014
                : 13 May 2015
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 55, Pages: 13
                Product

                SciELO Brazil

                Categories
                Nota Técnica

                riparian forest, adventitious roots,lenticels,coerana,mata ciliar,raízes adventícias,lenticela

                Comments

                Comment on this article