Successful fruit set depends on several reproductive processes including pollen germination and tube growth processes. An experiment was conducted to determine the effects of temperature on pollen germination characteristics and to identify species/genotypic differences in Capsicum using the cumulative temperature response index (CTRI) concept. Pollen was collected from plants of seven genotype...

Pollen tube growth is crucial for the delivery of sperm cells to the ovule during flowering plant reproduction. Previous in vitro imaging of Lilium longiflorum and Nicotiana tabacum has shown that growing pollen tubes exhibit a tip-focused Ca concentration ([Ca]) gradient and regular oscillations of the cytosolic [Ca] ([Ca2+]cyt) in the tip region.Whether this [Ca ] gradient and/ or [Ca]cyt osc...

Received December 28, 1960 A REVIEW of the early studies of the gametophyte factor (ga) on chromosome 4 of corn was presented by EMERSON (1934), when he published his data and discussion on this interesting pollen character. In certain female stylar tissue, the ga pollen that effects fertilization is reduced from the expected 50 percent to a mere 0-4 percent if it is competing with pollen carry...

Tobacco mature pollen has extremely desiccated cytoplasm, and is metabolically quiescent. Upon re-hydration it becomes metabolically active and that results in later emergence of rapidly growing pollen tube. These changes in cytoplasm hydration and metabolic activity are accompanied by protein phosphorylation. In this study, we subjected mature pollen, 5-min-activated pollen, and 30-min-activat...

1. Introduction 2. Review on computer vision and classification methods for pollen recognition 3. General overview of the standard method and hardware requirement 4. Description of the computational techniques of the methodology 4.1 Segmentation algorithm 4.2 Homogenizing the pollen loads of the image by mean shift filtering 4.3 One-class multi-classification algorithm based on distances 5. Val...

The dynamics of Poaceae pollen season, in particularly that of the Secale genus, in Szczecin (western Poland) 2004-2008 was analysed to establish a relationship between the meteorological variables, air pollution and the pollen count of the taxa studied. Consecutive phases during the pollen season were defined for each taxon (1, 2.5, 5, 25, 50, 75, 95, 97.5, 99% of annual total), and duration o...

Surrogate pollen induction (SPI) was evaluated on loblolly pine (Pinus taeda L.) donor scions from 5-year-old progeny that were grafted by topworking into the lower crowns of 16-year-old loblolly pine receptor clones in a seed orchard. On each of 25 study trees, one of three pollen induction treatments (wire girdle, saw girdle or control) was applied to 10 receptor branches below the graft loca...

INTRODUCTION Exposure to airborne pollen from certain plants can cause allergic disease, but allergens can also be found in non-pollen-bearing fractions of ambient air. This may explain why the allergic response in susceptible patients does not always coincide with the presence and magnitude of airborne pollen counts. Plantago pollen is an important cause of pollinosis in northern Mediterranean...

in order to study stigma receptivity in peach cultivars : (‘makhmali’, ‘anjiri-ye-tabestane’, ‘anjiri-ye maleki’, ‘haj-kazemi’ and ’zoodras’) controlled pollination was done in both field and laboratory conditions. before pollination trials the in vitro germination of the pollen was tested in petridish. branches with adequate number of flowers were chosen for controlled pollination. self pollin...