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Meiotic behavior and pollinic viability in bean cultivars

BIOCELL 2014年第1期38卷 33-38页

作者： gracieli dalla nora Solange Bosio TEDESCO Tamara PASTORI Viviane Dal-Souto FRESCURA Nerinéia Dalfollo RIBEIRO Haywood Dail LAUGHINGHOUSE IV Sidinei JoséLOPES Maria Teresa SCHIFINO-WITTMANN Laboratory of Cytogenetics and Plant Genotoxicity Department of BiologyCenter for Natural and Exact SciencesFederal University of Santa Maria(UFSM)Rio Grande do SulBrazil

The aims of this study were to determine the meiotic behavior and to estimate pollen grains via-bility in bean(Phaseolus vulgaris L.)*** buds were collected during different developmental stages of the Mesoamerican bean cultivars IAPAR 44,Guapo Brilhante,BRS Expedito,BRS Valente,Guateian 6662 and Pérola,and the Andean bean cultivar Iraí,grown in a *** meiotic index was determined by anther squashing of material fixed in absolute ethanol-glacial acetic acid(3:1)and stained with acetic *** meiotic abnormalities were observed and the meiotic indices were high for all cultivars,indicating that the mismatch generated during crosses is not related to any meiotic *** of pollen viability was made by comparing acetic orcein staining ***’s reactive:pollen viability was high in all cultivars with either stain,but was significantly higher when using the acetic orcein stain(>99%).Though some cultivar showed a significantly smaller pollen size,the range of variation among cultivars was low(means’range 51-66μm).

关键词： Acetic orcein Phaseolus vulgaris pollen Alexander’s reactive

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Using Geotechnology to Estimate Annual Soil Loss Rate in the Brazilian Cerrado

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Journal of Geographic Information System 2017年第4期9卷 420-439页

作者： Luciene Gomes Silvio J.C.Simoes Maria C.Forti Jean Pierre H.B.Ometto Eloi L.dalla nora Earth System Science Center(CCST) Brazilian Institute for Space Research(INPE)Sao Jose dos CamposBrazil Department of Environmental Engineering Institute of Science and TechnologySao Paulo State University(UNESP)Sao Jose dos CamposBrazil

Soil erosion is a serious environmental problem that has adversely affected the world’s food production through the reduction of land productivity and water availability. The present study estimated annual soil loss rate and its spatial distribution in the most important Brazil’s agricultural region, the Brazilian Cerrado, using Revised Soil Loss Equation (RUSLE) model into Geographic Information System (GIS) framework. For this purpose, the soil erosion annual rate was determined in function of RUSLE model factors: rainfall erosivity (R), soil erodibility (K), topography (LS), crop management (C) and supporting conservation practice (P). All factors were obtained from literature. They were processed and integrated into a GIS, resulting in a map of annual soil loss rate. The methodology applied showed acceptable precision and it was possible to identify the most susceptible areas to water erosion. The average estimated rate of soil loss for the entire Cerrado was 12.8 t•ha−1•yr−1. Large part of the Cerrado is under low soil loss zone corresponding to 79.91% of total surface area, while 15.70%, 3.74%, and 0.66% are under moderate, high, and very high, respectively. The average estimated rate of soil loss in areas used for silviculture was 52.1 t•ha−1•yr−1. In semi-perennial, perennial, and annual crops cultivation were 29.3, 23.9, and 9.8 t•ha−1•yr−1, respectively, while in the pasture was 13.3 t•ha−1•yr−1. Except for annual crops, all farm and silviculture areas showed average soil loss ranging from moderate to high rate. These results suggest that the implementation of more effective management techniques and conservation practices are necessary for the Cerrado to maintain and to improve land productivity by ensuring national and international food demands.

关键词： Erosion Soil Conservation Geographic Information System(GIS) Tropical Savanna MATOPIBA

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