Nitrogen metabolism in alfalfa nodulated under phosphorus supression and resupply
Abstract : Pi suppression and resupply effects were studied on nitrogen metabolism by means studied of evaluating on nitrogen biological fixation (N2), GS, Fd-GOGAT and NADH-GOGAT activities in alfalfa cv.

Analysis of marker gene/ selective agent systems alternatives to positive selection of transgenic papaya (Carica papaya L.) Somatic embryos
Abstract : Questions relative to biosafety and public perception of genetically modified organisms have taken those involved on the development of transgenic plants to a phase out on the use of antibiotic resistance marker genes.

Relationship of reading of portable chlorophyll meter with contents of extractable chlorophyll and leaf nitrogen in maize
Abstract : The methods used to determine the amount of leaf chlorophyll require destruction of tissues samples and much work in the process of its attainment.

Differential gene expression in soybean during water deficit
Abstract : Tolerance to drought in plants is not a simple trait, but rather a complex of mechanisms working in combination to avoid or to tolerate water deficit.

Effect of leucaena aqueous extract on the development, mitotic index and peroxidase activity in maize seedlings
Abstract : Leucaena (Leucaena leucocephala (Lam.) de Wit) has been observed to control weeds when used as soil mulch.

Growth and mineral nutrition of Eucalyptus maculata and Eucalypts urophylla in nutrient solution with increasing concentration of copper
Abstract : The effects of increasing concentrations of Cu in nutrient solution on growth, content and translocation of heavy metals and mineral nutrients in eucalyptus were evaluated.

Effect of herbicides on the polymerization of the microtubule and induction of micronuclei in Helianthus maximiliani protoplasts
Abstract : In order to verify the kinetics of microtubule depolymerization and dynamics of micronuclei induction, two anti-mitotic herbicides, Amiprophos-methyl and Oryzalin, were added to dividing cells of Helianthus maximiliani.

Germination in developing seeds of Bixa orellana
Abstract : The objective of this work was to investigate the acquisition of germination capacity and the onset of dormancy in developing seeds of Bixa orellana L. (annatto).

Agrobacterium tumefaciens-mediated transformation of tomato processing cultivars
Abstract : The objective of this study was to adapt an A. tumefaciens-mediated genetic transformation system to the processing of the Brazilian tomato cultivars IPA-5 and IPA-6.

Sap flow and stomatal conductance of two evergreen woody species in an open savanna and a savanna woodland
Abstract : The climate in the central Brazilians savannas ("cerrados") is characterized by well-defined dry (May to September) and wet (October to April) seasons.

Defoliation and low temperature in micropropagated apple plants to overcoming the growth cessation during the acclimatization
Abstract : The present work aimed to evaluate the effect of the temperature and defoliation on the growth of micropropagated apple plants, cv. 'Marubakaido', during the acclimatization process

Effect of saline stress and exogenous proline in maize callus
Abstract : This work aimed at evaluating the effect of different NaCl concentrations (0, 68, 137 and 205 mM) in two maize (Zea mays L.) genotypes (W64Ao2 and Arizona 8601) callus cultures in N6 medium

Viabilty evaluation of pollen as possible indicator of high temperature tolerance in tomato genotypes
Abstract : The objective of this research was to evaluate the behavior of five cultivars ( Carmem, IPA- 5, Principe gigante, Santa Clara TSW - 10 ) and tomato line ( CL5915), in relation to high temperature tolerance, using pollen viability.

Sulfur Assimilatory Metabolism. The Long and Smelling Road
Sulfur represents the ninth and least abundant essential macronutrient in plants, preceded by carbon, oxygen, hydrogen, nitrogen, potassium, calcium, magnesium, and phosphorus.

Vertical Gradient in Photosynthetic Properties of Spinach Chloroplasts Dependent on Intra-Leaf Light Environment
The study shows that both the biochemical and ultrastructural properties of the chloroplasts change gradually and continuously from sun- to shade-type with the depth from the adaxial surface.

Construction and Maintenance of the Optimal Photosynthetic Systems of the Leaf, Herbaceous Plant and Tree: an Eco-developmental Treatise
Construction and maintenance mechanisms of efficient photosynthetic systems at three different scaling levels are reviewed mainly based on the nitrogen optimization theory.

Photosynthesis, sugars and the regulation of gene expression
In this review, a compilation of the genes encoding photosynthetic proteins, subject to this mode of regulation, is presented.

Physiological Signals That lnduce Flowering
Both physiological and genetic results support the theory of a multifactorial control of flowering, study shows.

Senescence Is Induced in Individually Darkened Arabidopsis Leaves, but Inhibited in Whole Darkened Plants
The light status of the rest of the plant influences the senescence progression of the individual leaf, study shows.

How Plants Avoid Feeling The Burn
Too much sun – for plants as well as people – can be harmful to long-term health. But to avoid the botanical equivalent of "lobster tans," plants have developed an intricate internal defense mechanism, called photoprotection, which acts like