The effect of gamma radiation on pollen germination capacity and pollen tube growth was evaluated in vitro and in situ conditions. In vitro experiments, revealed that irradiation signi®cantly affects pollen viability, mainly for levels higher than 200 Grays (Gy). Also, for levels higher than 200 Gy, in situ observations showed that no pollen tube reached the ovule. Fruit set results con®rmed th...

Ginger (Zingiber spectabile) is cultivated worldwide as a floriculture and landscaping species. Studies on the biology floral morphology of this species are important for its improvement; however, they scarce. We investigated reproductive gingers grown in germplasm bank. Floral development was monitored during pre-anthesis anthesis periods. morphometry, pollen viability, stigmatic receptivity, ...

The development of sperm cells (SCs) from microspores involves a set of finely regulated molecular and cellular events and the coordination of these events. The mechanisms underlying these events and their interconnections remain a major challenge. Systems analysis of genome-wide molecular networks and functional modules with high-throughput "omics" approaches is crucial for understanding the m...

All cells respond to osmotic challenges, including those imposed during normal growth and development. Mechanosensitive (MS) ion channels provide a conserved mechanism for regulating osmotic forces by conducting ions in response to increased membrane tension. We previously demonstrated that the MS ion channel MscS-Like 8 (MSL8) is required for pollen to survive multiple osmotic challenges that ...

Iconic examples of insect pollination have emphasized narrowly specialized pollinator mutualisms such as figs and fig wasps and yuccas and yucca moths. However, recent attention by pollination ecologists has focused on the broad spectra of pollinated plants by generalist pollinators such as bees. Bees have great impact for formulating hypotheses regarding specialization versus generalization in...

Drimia is a heterogeneous, poorly understood genus that requires major rearrangement. Chromosome behavior of gigantea and viridula; two species in D. altissima complex was studied for karyotypes transmission extra chromosomes pair pollen viability. Meristematic cells at the root tips viridula were by conventional cytogenetic karyotype analysis. numbers 2n = 22 20 viridula, respectively. Extra c...

Background: The research was conducted to screen rice cultivars with resistance ability high-temperature conditions and analyze the relationship between pollen viability filled grain of native Indonesia cultivars. Methods: seeds were germinated, sown into a tray then transplanted pots sandy loam compost 3:1. After 20% flowering, four each cultivar kept under ambient temperature (28-32°C) other ...

Genipa americana L., commonly known as genipap, belongs to the Rubiaceae family. This study aimed describe pollen morphology of species, evaluate its meiotic behavior and viability, provide information help maintenance conservation species in natural habitat. Flower buds were collected from 20 individuals Alta Floresta Matupá municipalities, Mato Grosso, Brazil. Pollen was characterized using a...