53 research outputs found
Barley plasma membrane intrinsic proteins (PIP aquaporins) as water and CO2 transporters
We identified barley aquaporins and demonstrated that one, HvPIP2;1, transports water and CO2. Regarding water homeostasis in plants, regulations of aquaporin expression were observed in many plants under several environmental stresses. Under salt stress, a number of plasma membrane-type aquaporins were down-regulated, which can prevent continuous dehydration resulting in cell death. The leaves of transgenic rice plants that expressed the largest amount of HvPIP2;1 showed a 40% increase in internal CO2 conductance compared with leaves of wild-type rice plants. The rate of CO2 assimilation also increased in the transgenic plants. The goal of our plant aquaporin research is to determine the key aquaporin species responsible for water and CO2 transport, and to improve plant water relations, stress tolerance, CO2 uptake or assimilation, and plant productivity via molecular breeding of aquaporins.</p
Leaf Morphological Plasticity of Tree Species from Two Developmental Stages in Araucaria Forest
Influência da qualidade de luz e silÃcio no crescimento in vitro de orquÃdeas nativas e hÃbridas
Leaf-trait relationships of Quercus liaotungensis along an altitudinal gradient in Dongling Mountain, Beijing
Responses of carbon and oxygen stable isotopes in rice grain (Oryza sativa L.) to an increase in air temperature during grain filling in the Japanese archipelago
Rapid response of leaf photosynthesis in two fern species Pteridium aquilinum and Thelypteris dentata to changes in CO2 measured by tunable diode laser absorption spectroscopy
The Influence of Leaf Thickness on the CO2 Transfer Conductance and Leaf δ1 3C for Some Evergreen Tree Species
Physio-anatomic aspects on the initial growth of Guazuma ulmifolia Lam. seedlings (Sterculiaceae)
This paper aimed to evaluate the initial growth of "mutambo" seedlings in different conditions of light intensity and treatments with gibberellic acid (GA). The seedlings were kept under full sun and 50% of shading. Sixty days after the emergence, seedlings were sprayed with: 1) 100 mg L-1 GA3; 2) 200 mg L-1 GA3; 3) control. At the end of the appraisals, seedlings height under 50% of shading was compared to the height that were growing under full sun with 200 mg L-1 GA. Stem diameter was lower under shading. Leaf area did not vary among the treatments, but the root system growth was higher under full sun and did not vary among GA levels. The number of stomata, trichomes and epidermal cells on adaxial and abaxial sides was higher under full sun. Total dry masses of leaf and root were highe runder full sun and with 200 mg L-1 GA application. "Mutambo" seedlings presented a higher initial growth under full sun, although with a lower height, diameter, and lenght of the largest root and total dry masses of leaf and root were higher. A concentration with 200 mg L-1 promoted a higher growth<br>O objetivo desse trabalho foi avaliar o crescimento inicial das mudas de mutambo em diferentes condições de luminosidade e tratamentos com ácido giberélico (GA). As mudas foram mantidas em sombrite 50% de sombra e a pleno sol e aos 60 dias após a emergência as mudas foram pulverizadas com: 1) ácido giberélico 100 mg L-1; 2) ácido giberélico 200 mg. L-1 e 3) testemunha. Ao final das avaliações a altura sob 50% de sombreamento foi maior comparada com aquelas crescendo a pleno sol com GA 200 mg L-1. O diâmetro de colo foi menor sob sombreamento. A área foliar não variou entre os tratamentos, porém o crescimento do sistema radicular foi maior a pleno sol não variando entre os nÃveis de GA. O número de estômatos, tricomas e células epidérmicas nas faces adaxial e abaxial foram maiores a pleno sol. As massas secas total, de folha e raiz foi maior a pleno sol e com aplicação deGA 200 mg L-1. As mudas de mutambo apresentaram umcrescimento inicial melhor a pleno sol, embora com menoraltura, o diâmetro, o comprimento da maior raiz e a massaseca total, de folha e de raiz foram maiores. A concentraçãode 200 mg L-1 de GA promoveu maior cresciment
Morphological and physiological responses of three plant species occurring in distinct altitudes in the Neotropical savannah
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