2 edition of Factors affecting pollen germination and longevity in hops, Humulus lupulus L found in the catalog.
Factors affecting pollen germination and longevity in hops, Humulus lupulus L
C. E. Zimmermann
|Statement||by Charles Edward Zimmermann.|
|The Physical Object|
|Pagination||44 leaves, bound :|
|Number of Pages||44|
Pollen germination: Pollen germination Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination. Like seeds, pollen grains are severely dehydrated before being released . promote pollen germination by affecting H+-ATPase activity, which initiates pollen germination and tube growth . Boron deficiency symptoms first appear at growing points, such as root tips and pollen tube tips . Boron deficiency greatly reduces cell wall plastic extensibility and impairs normal cell elongation in growing plant tissue .
A brief history of the analysis of cis-zeatin derivatives. cis-Zeatin-type cytokinins (cZs) are a group of cytokinins (CKs) that have largely been ignored when compared to trans-zeatin (tZ) isomers or other highly active lack of interest in cZs is based mainly on their lower activity in the classical CK bioassays. However, the research on cZs has also been restricted by the. On the stigma, the germination of pollen grains begins by absorption of water and nutrients and the pollen grain produces a tiny pollen tube through the style to the ovary. The tube cell enlarges and comes out of the pollen grain through one of the germ pores to form a pollen tube. The tube nucleus descends to the tip of the pollen tube.
metabolism during germination, the impact of the environment on seed vigor, the mechanisms of seed dormancy exit, or those accounting for the exceptional survival of embryo in a dry state. References 1Rajjou L, Duval M, Gallardo K, Catusse J, Bally J, Job C, Job D. Seed germination and vigor. Annual Review of Plant Biol plants. Satisfactory pollen germination requires solution of carbohydrate, especially sucrose (Patel et al., ), with or without other substances. Impatiens balsamina L. pollen germinated on the modified basal medium of Brewbaker and Kwack in order to obtain the optimum percentage of pollen germination and tube growth in this plant.
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Factors affecting pollen germination and longevity in hops, Humulus lupulus LAuthor: C. Zimmermann. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link).
Some of the factors which influence pollen germination and tube growth in plants are carbohydrate (sugar), boron, calcium, enzymes, plant hormones, magnesium, potassium, agar, pH and certain physical factors such as temperature and light.
The requirements are species specific (John and. Plantas dióicas. Humulus lupulus. 1 INTRODUCTION Humulus lupulus L., commonly known as the common hop, is a dioecious plant species belonging to the Cannabaceae family (DURAISAMY et al., ).
Female plants are economically important due to the use of their flowers in the brewing industry (KARABÍN et al. ).Author: Marília Pereira Machado, Andreza Cerioni Belniaki, André Felipe Bernert, Erik Nunes Gomes, João Carl.
The Relationship Between the Number of Vines per Hill and Yield in Hops (Humulus lupulus L.). The media was solidified with 2% agar. Pollen germination and pollen tube growth were determined by placing 2 mL of germinating media on a glass slide and inoculating it with a sample of pollen.
Slides with media and pollen were then placed in Petri dishes lined with moist filter paper thus serving as germination chambers.
Youmbi, E., The, C. & Tedjacno, A. Conservation of the germination capacity of pollen grains in three varieties of maize (Zea mays L.).
– Grana – ISSN Maize pollen longevity is short under natural conditions, and the seed yield is hampered by poor synchronisation between pollen shed and ovule maturity.
We explored the effect of GABA on pollen germination and tube growth in our system, using a medium containing mM spermidine and 10% sucrose. GABA concentrations within the physiological range (,5 and 10 mM) were found to affect pollen germination marginally and pollen tube growth significantly (Fig.
7a,b). Ten millimolar GABA. Pollen quality is important for growers and breeders. This study was carried out to determine in vitro pollen viability and pollen germination in seven genotypes of cherry laurel (Prunus laurocerasus L.).
Two pollen viability tests, TTC (2,3,5-triphenyl tetrazolium chloride) and IKI (iodine potassium iodide), were used. about factors that may affect pollen and allergen dispersion. Finally, in vitro studies also focused on the characterization of two allergenic enzymes, deeply involved in pollen cell wall organization and hugely secreted during pollen rehydration, i.e.
pectate-lyases from Ambrosia artemisiifolia and Artemisia vulgaris. The physico. among the most important environmental factors rate and pollen tube length affecting plant reproductive processes such as pollen Pollen grains collected from the freshly dehisced in pollen longevity (Buitinket al., ) Stigma Style Pollen germination % Sucros e g/L 4 Boric 1h 2h 3h 4h h 3 h 2 h 1 h Time 0 0 4 3 0 0 0 2 0 Hop (Humulus lupulus L.) is a plant with economic importance due to its use in the brewing industry.
The cones produced by the species contain the main substances responsible for the beer's. The effects of acidic and trace element components of polluted rain on pollen germination and tube growth in vitro are described. The sensitivity of pollen to pH in vitro was related to the species' position in canopy and was different for conifers and broad‐leaved trees.
Most pollen assayed revealed significant inhibition of germination and germ tube growth in response to pHs currently. The studies were carried out at Kasetsart University, Kampaengsaen Campus, Nakompratom Province, Thailand.
There was variation of pollen germination on the clones. Pollen were collected from florets at the apex of inflorescence (68%) which had better germination than at the middle (64%) or at the base (58%) of inflorescence.
Percent germination of the late blooming inflorescence stage (74%) was. Pollen germination in vitro is a reliable method to test the pollen viability. It also addresses many basic questions in sexual reproduction and particularly useful in wide hybridization.
Many pollen germination medium ranging from simple sugars to complex one having vitamins, growth regulators, etc. in addition to various minerals have been standardized to germinate pollen artificially.
Full text of "English and foreign publications on hops" See other formats. Factors affecting pollen germination and longevity in hops, Humulus lupulus L C. Zimmermann Graduation date: File scanned at ppi (Moochrome.
Schleichera. Viable pollen was recovered on native bees first leaving their nests in early morning, indicating prolonged pre-pollination potential.
Various factors influence pollen viability in tropical field conditions. Thrips may effectively remove a large portion of pollen and exert more influence than physical exposure.
Some flowers. Temperature has a clear effect on pollen tube kinetics, expressed as the time required for pollen germination and the rate of pollen tube growth.
Although temperature affects pollen tube kinetics, information on the effect of temperature on pollen tube dynamics, expressed as the census of the microgametophyte population that succeeded in reaching the base of the style, is lacking (Hedhly et.
Humulus is a twining, rough perennial herb with simple, opposite leaves. It is found growing wild in open or wooded, moist areas, along roadsides, streams and river banks.
The plant is cultivated for the resinous material in the flowers which is used to make beer. Germination of pollen grains and growth of pollen tubes were studied to determine the cause of barreness in crosses among annual Cicer species. In vivo and in vitro time-course studies and fluorescent microscopy revealed no pollination incompatibility among the selfs, crosses and reciprocals of C.
arietinum L., C. reticulatum Lad. and C. cuneatum Rich. Here the grains are spheroid to suboblate, rarely pyramidal, sulcus measures ¡m in length and ¡m in breadth.
Iljas () and Martin and Gregory () also reported that pollen grains are small, the mean diameter being approximately 10 ¡m irrespective of cultivars. Pollen morphology of Piper was also reported by Mitrou ().Pollen germination starts with the pollen grain landing on stigma.
The cell of the pollen grain divides into two cells- one of these is smaller in size and called generative cell and bigger one is called tube cell.
The intine grows out through the germ pore and form pollen tube. It grows into the tissue of the style towards the ovary.