The germination of pollen grains in artificial cultures inEphedra foliata boiss andEphedra gerardiana wall

1938 ◽  
Vol 8 (3) ◽  
pp. 218-230
Author(s):  
P. N. Mehra
Keyword(s):  
Pollen Grains ◽  
Germination Of Pollen

Germination of pollen grains in the oesophagus of individuals with eosinophilic oesophagitis

2018 ◽  
Vol 49 (4) ◽  
pp. 471-473 ◽  
Author(s):  
Alicia Armentia ◽  
Sara Martín‐Armentia ◽  
Rafael Álvarez‐Nogal ◽  
Blanca Martín Armentia ◽  
Manuel José Gayoso ◽  
...  
Keyword(s):  
Pollen Grains ◽  
Eosinophilic Oesophagitis ◽  
Germination Of Pollen

scholarly journals In vitro Pollen Grain Germination and Tube Growth of Ten Iranian Jujube (Ziziphus jujuba) Cultivars

2014 ◽  
Vol 6 (2) ◽  
pp. 158-162
Author(s):  
Hossein ROUHAKHSH ◽  
Gholamhossein DAVARYNEJAD ◽  
Majid RAHEMI ◽  
Bahram ABEDI
Keyword(s):  
Pollen Grains ◽  
Tube Growth ◽  
Commercial Cultivation ◽  
Randomized Design ◽  
Factorial Trial ◽  
Ziziphus Jujuba ◽  
Coefficient Of Velocity ◽  
Germination Of Pollen ◽  
Mean Time

Jujube (Ziziphus jujuba) is a species particularly prone to erratic fruit set. Several causes such as pollen germination and tube growth involve in this behaviour. Thus, the present research aimed to evaluate and compare of pollen grains germination and tube growth of ten Iranian jujube cultivars on in vitro condition. A factorial trial based on completely randomized design with five replications was carried out. The pollen grains were collected from un-opened-flowers of Al-Ghour’, ‘Bardaskan’, ‘Doroh’, ‘Gazik’, ‘Ghom’, ‘Giouk’, ‘Kangan’, ‘Kalkestan’, ‘Magham Sari’ and ‘Noghab’ cultivars at balloon stage. This study showed that there were significant differences among the cultivars in all measured factors. The highest percentage of pollen grains germination was observed for ‘Gazik’, followed by ‘Bardaskan’, while the lowest was in ‘Al-Ghour’. The percentage of pollen grains germination increased with the increasing time of incubation period up to 36 h. Also, flowering times are found to be effective in germination of pollen grains, which 1 flash had highest percentage of germination of pollen grains than in comparison to other flowering times. The results also showed that the mean time germination varied from 24.52-25.92 h, mean hourly germination from 0.67-1.55, hourly germination speed from 0.64-1.48 and coefficient of velocity of germination of pollen grains from 0.058-0.061. The length of pollen tube was found between 44.4 and 624.8 µm. These data demonstrated that cultivar is the main factor determining pollen grains germination and tube growth in jujube, which this important information can be useful for selection of superior desirable jujube genotypes for bringing to commercial cultivation.

Studies on the Germination of Pollen Grains of the Tea Plant

1953 ◽  
pp. 23-27
Author(s):  
Niro TOMO ◽  
Yasumoto FUCHINOUE ◽  
Hiroko YAMANE
Keyword(s):  
Pollen Grains ◽  
Tea Plant ◽  
Germination Of Pollen

Vitamins and the Germination of Pollen Grains and Fungus Spores

1939 ◽  
Vol 100 (4) ◽  
pp. 844-852 ◽  
Author(s):  
William C. Cooper
Keyword(s):  
Pollen Grains ◽  
Germination Of Pollen

scholarly journals Persistence of the Effects of Se-Fertilization in Olive Trees over Time, Monitored with the Cytosolic Ca2+ and with the Germination of Pollen

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2290
Author(s):  
Alberto Marco Del Pino ◽  
Luca Regni ◽  
Roberto D’Amato ◽  
Alessandro Di Michele ◽  
Primo Proietti ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Pollen Grains ◽  
Selenium Content ◽  
Nutritional Properties ◽  
Beneficial Effects ◽  
Olive Trees ◽  
Living Organisms ◽  
Olive Pollen ◽  
Germination Of Pollen ◽  
Over Time

Selenium (Se) is an important micronutrient for living organisms, since it is involved in several physiological and metabolic processes. Biofortification with Se increases the nutritional and qualitative values of foods in Se-deficient regions and increases tolerance to oxidative stress in olive trees. Many studies have shown that Se, in addition to improving the qualitative and nutritional properties of EVO oil, also improves the plant’s response to abiotic stress. This study addressed this issue by monitoring the effects of Se on cytosolic Ca2+ and on the germination of olive pollen grains in oxidative stress. The olive trees subjected to treatment with Na-selenate in the field produced pollen with a Se content 6–8 times higher than the controls, even after 20 months from the treatment. Moreover, part of the micronutrient was organic in selenium methionine. The higher selenium content did not produce toxic effects in the pollen, rather it antagonized the undesirable effects of oxidative stress in the parameters under study. The persistence of the beneficial effects of selenium observed over time in pollens, in addition to bringing out an undisputed adaptability of olive trees to the micronutrient, suggested the opportunity to reduce the number of treatments in the field.

scholarly journals Environmental pollution changes in membrane lipids, antioxidants and vitality of Scots pine (Pinus sylvestris L.) pollen

2011 ◽  
Vol 72 (2) ◽  
pp. 99-104 ◽  
Author(s):  
Paweł M. Pukacki ◽  
Władysław Chałupka
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Membrane Lipids ◽  
Pollen Grains ◽  
Pollution Source ◽  
Polluted Area ◽  
Cytoplasmic Membranes ◽  
And Control ◽  
Germination Of Pollen ◽  
Low Molecular Antioxidants

Investigations were carried out on pollen grains of Scots pine (<em>Pinus sylvestris </em>L.) collected from trees at 1.5, 3, 4 km and control, 20 km from the Luboń factory producing mineral fertilisers. The percentage of germination of pollen formed close to the pollution source was ca 20% lower compared to the control pollen. Lowered vitality of the pollen was effected in changes of the structure of cytoplasmic membranes. Pollen from the polluted area contained ca 15% less total phospholipids, mainly phosphatidylcholine and phosphatytidylinositol and had a lower content of soluble proteins and less of low molecular antioxidants, such as thiols and ascorbic acid. Composition of total fatty acid in phospholipids fractions showed a significant reduction in the degree of unsaturation of fatty acids. Pollen originating from the polluted area and stored at -30°C showed considerably stronger degradation of cytoplasmic membranes than control.

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