Polygala paniculata L.is a medicinal plant that grows in the Brazilian Atlantic coast,known as‘barba-de-São-João’,‘barba-de-bode’,‘vassourinha branca’,and‘mimosa’.In this study,pollen viability was e...Polygala paniculata L.is a medicinal plant that grows in the Brazilian Atlantic coast,known as‘barba-de-São-João’,‘barba-de-bode’,‘vassourinha branca’,and‘mimosa’.In this study,pollen viability was estimated by three different staining methods:2%acetic orcein,2%acetic carmine,and Alexander’s stain.The young inflorescences of twenty accessions were collected and fixed in a solution of ethanol:acetic acid(3:1)for 24 hours,then stored in ethanol 70%under refrigeration.Six slides per plant,two for each stain,were prepared by squashing,and 300 pollen grains per slide were analyzed.Pollen viability was high(>70%)for most accessions of P.paniculata using the Alexander’s stain,which proved the most adequate method to estimate pollen viability.展开更多
The aims of this study were to determine the meiotic behavior and to estimate pollen grains via-bility in bean(Phaseolus vulgaris L.)cultivars.Flower buds were collected during different developmental stages of the Me...The aims of this study were to determine the meiotic behavior and to estimate pollen grains via-bility in bean(Phaseolus vulgaris L.)cultivars.Flower 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 greenhouse.The meiotic index was determined by anther squashing of material fixed in absolute ethanol-glacial acetic acid(3:1)and stained with acetic orcein.No 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 changes.Estimation of pollen viability was made by comparing acetic orcein staining vs.Alexander’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).展开更多
文摘Polygala paniculata L.is a medicinal plant that grows in the Brazilian Atlantic coast,known as‘barba-de-São-João’,‘barba-de-bode’,‘vassourinha branca’,and‘mimosa’.In this study,pollen viability was estimated by three different staining methods:2%acetic orcein,2%acetic carmine,and Alexander’s stain.The young inflorescences of twenty accessions were collected and fixed in a solution of ethanol:acetic acid(3:1)for 24 hours,then stored in ethanol 70%under refrigeration.Six slides per plant,two for each stain,were prepared by squashing,and 300 pollen grains per slide were analyzed.Pollen viability was high(>70%)for most accessions of P.paniculata using the Alexander’s stain,which proved the most adequate method to estimate pollen viability.
基金the study and for a graduate fellowship and to CNPq for an undergraduate fellowship.
文摘The aims of this study were to determine the meiotic behavior and to estimate pollen grains via-bility in bean(Phaseolus vulgaris L.)cultivars.Flower 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 greenhouse.The meiotic index was determined by anther squashing of material fixed in absolute ethanol-glacial acetic acid(3:1)and stained with acetic orcein.No 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 changes.Estimation of pollen viability was made by comparing acetic orcein staining vs.Alexander’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).
