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Thursday, April 30, 2020 | History

2 edition of Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L found in the catalog.

Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L

Norman Richard Bradner

Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L

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  • 15 Currently reading

Published .
Written in English

    Subjects:
  • Alfalfa -- Pollination.,
  • Alfalfa -- Seeds.,
  • Bees.

  • Edition Notes

    Statementby Norman Richard Bradner.
    The Physical Object
    Pagination74 leaves, bound :
    Number of Pages74
    ID Numbers
    Open LibraryOL14336886M

    Medicago sativa, alfalfa or lucerne, and M. arborea were considered reproductively isolated until recently. Then, in , an alfalfa genotype was identified that produced a few seeds and progeny with hybrid traits after a large number of pollinations by M. arborea. A derivative of this alfalfa genotype also produced a low frequency of progeny with hybrid by: 4. haP1f) are important pests 1n irr1gated alfalfa (Medicago sativa L.) fields of the PaC1 ic Northwest and may cause heavy losses of hay and seed production. D. dipsaci attacks the stem and foliage, causing susceptible plants to become stunted and aistorted with swollen buds, shoots and stem Size: 2MB. A Study of Factors Affecting the Germination of Alfalfa and Safflower Pollen Ling Lin Utah State University Follow this and additional works at: Part of the Plant Breeding and Genetics Commons Recommended Citation Lin, Ling, "A Study of Factors Affecting the Germination of Alfalfa and Safflower Pollen" (). All. Persist III is the forage yield leader of conventional alfalfas across the greater, dormant alfalfa growing regions of the Northern United States. It is an elite trifoliate alfalfa variety with improved yield, quality, disease resistance, and persistence. With its fine stemmed, leafy characteristics, it exhibits superior forage quality. It has established an outstanding track record of.

    Alfalfa (Medicago sativa L.) is one of the most cultivated forage legumes in Morocco thanks to its great adaptation to the climatic conditions of this country, its high protein content and its ability to fix atmospheric nitrogen in symbiosis with rhizobia. Environmental stresses such as drought and salinity constitute a major factor limiting the symbiotic nitrogen fixation and legume Author: Mohammed Mouradi, Mohamed Farissi, Yahya Lahrizi Abdelaziz Bouizgaren, Ahmed Qaddoury, Cherki Ghoula.


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Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L by Norman Richard Bradner Download PDF EPUB FB2

The objectives of this study were (a) to measure the amount of cross-pollination caused by three bee species at 10, 20 and 40 rods distance from a foreign pollen source, (b) to measure the effects of bee species, planting pattern and season on broad sense heritability estimates for seed yield in alfalfa, (c) to determine the incidence of selfing caused by the bees, (d) to Author: Norman Richard Bradner.

SOME FACTORS THAT AFFECT POLLINATION AND SEED FORMATION IN ALFALFA, MEDICAGO SATIVA L. INTRODUCTION Alfalfa (Medicago sativa L.) is one of the most important forage crops in the world.

Even though this plant species has been cultivated for centuries, many problems regarding its management and culture are yet to be solved.

Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L. Abstract. Graduation date: The objectives of this study were (a) to measure the amount\ud of cross-pollination caused by three bee species at 10, 20 and 40\ud rods distance from a foreign pollen source, (b) to measure the effects\ud of bee species.

In this article we compare the potential impact of self-pollination on seed set in alfalfa, Medicago sativa L. (Leguminosae), at high versus low flower standing crops. Alfalfa flowers are organized in racemes of ≈+ buds that open over the course of ≈1 wk (McGregor ; unpublished data).Cited by: Some factors that affect pollination and seed formation in alfalfa, Medicago sativa L.

PhD. BRAJCICH, PEDRO. Estimates of heterosis for five agronomic traits in selected winter X spring wheat X winter wheat crosses, Triticum aestivum, L. em Thell. BRAJCICH, PEDRO. due to the possibility of achieving early pollination and set seed. Distance between the bee domiciles is also an important criterion.

As a general rule, growers try to place at least one bee domicile for every 3 to 4 ha. Four to fi ve gallons of bees (1 gallon = approximat bees) are utilized for each acre. Flower development, pollination, and fertilization are important stages in the sexual reproduction process of plants; they are also critical steps in the control of seed formation and development.

During alfalfa (Medicago sativa L.) seed production, some distinct phenomena such as a low seed setting ratio, serious flower falling, and seed abortion commonly by: 2.

Cooper DC, Brink RA () Partial self-incompatibility and the collapse of fertile ovules as factors affecting seed formation in alfalfa. J Agric Res – Google Scholar Cooper DC, Brink RA, Albrecht HR () Embryo mortality in relation to seed formation in alfalfa (Medicago sativa).

Which of the following factors has the potential to affect population growth. Food availability, pollutants, and birth rate. In the specific name for the alfalfa, Medicago sativa L., Medicago is the.

Genus name. Some algae form a specialized structure to produce the male gamete, the structe called. The alfalfa leafcutting bee, Megachile rotundata F., is used extensively to pollinate alfalfa for seed production in western North America. However, it usually is not possible to sustain bee.

Abstract: Provision of pollinators is the most important moments for alfalfa productivity. Honeybee, due to its abundance and mobility is a significant pollinator in the production of alfalfa seed.

Problems that arise in pollination of alfalfa led many researchers to pay attention to the pollination of this : Bekele Mechalu. Insect Pollinators and Foraging Behavior of Honey Bees on Alfalfa (Medicago sativa L.) in Saudi Arabia.

The study aimed to evaluate the impact of phosphorus fertilization and honeybee pollination on alfalfa seed production. The experiment was divided into 9 treatments of open pollination, honeybee pollination, and non-pollination with three different levels (0, or kg P 2O 5 /ha/year) of triple super by: 3.

Alfalfa (Medicago sativa, lucerne) is a herbaceous perennial legume used primarily as a hay crop and has a high feeding value. In many regions it is a key component of cropping systems valued for its deep roots and its contribution to soil fertility because of nitrogen fixation, and it is established from seeds.

There is some evidence that alfalfa may act like estrogen, and this might affect the pregnancy. Auto-immune Diseases: Alfalfa might cause the immune system to become more active, and this could increase the symptoms of these : Tracheophytes.

Production of Mn-P in alfalfa, howeven, in most cases adversely affected plant growth and development. Affected plants were stunted with yellowing foliage, but survived and produced seed.

Results from field trials showed that Mn-P production in transgenic alfalfa reduced dry matter yield and plant by:   Cytoembryological Analysis Of Causes For Poor Seed Set in Alfalfa (Medicago Sativa L.) Poor seed set is a limiting factor in alfalfa br eeding, as it slows the selection response.

One strategy used to overcome this problem is to search for mutations of inflorescence morphology. Long-peduncle (lp), branched-raceme (br) and top-flowering (tf) inflorescence. The vesicular‐arbuscular (VA) mycorrhizal status of three alfalfa (Medicago sativa L.) nodulation genotypes (nod + fix +, nod + fix − and nod − fix −) was investigated using pot cultures of three fungal species from two genera (Glomus monosporum Gerd.& Trappe, Glomus fasciculatum (Thaxter) Gerd.

& Trappe emend. Walker & Koske and Gigaspora margarita Becker & Hall).Cited by:   Soil salinity is an important factor affecting growth, development, and productivity of almost all land plants, including the forage crop alfalfa (Medicago sativa). However, little is known about how alfalfa responds and adapts to salt stress, particularly among different salt-tolerant cultivars.

Among seven alfalfa cultivars, we found that Zhongmu-1 (ZM) is relatively Cited by: Demand for better adapted, disease- and insect-resistant cvs has prompted extensive alfalfa breeding programs. Medicago sativa easily hybridizes with Medicago falcata (which is sometimes treated as a subspecies of M.

sativa). Most newer cvs are synthetics, i.e., they contain a set of selected clones or seed lines produced and maintained under. This paper reviews the current status, methodology, achievements, and prospects of alfalfa (Medicago sativa L.) breeding in China.

There are 77 cultivars that have been registered in the country, these include 36 cultivars bred through breeding programs, 17 introduced from overseas, 5 domesticated from wild ecotypes, and 19 through regional collection/breeding by: Seeds of alfalfa (Medicago sativa L., cultivar Nubaria 1) were procured from El-Nubaria, El-Behira Governorate, Egypt.

For cultivation, clay and sand were mixed to obtain three types of soil w 67 and % sand proportion. Plastic pots were packed with the soil samples then twenty seeds were sown in each : Bardees M.

Mickky, Muhammad A. Abbas, Omar A. El-Shhaby. Data from embryological studies during the first 6 days after self- and cross-pollination of some once inbred plants of lucerne are presented and analysed statistically. The average seed set per flower after selling was and after crossing This difference could be accounted for in terms of the lower frequency with which self pollen achieved fertilization (% as against Cited by: Alfalfa Medicago sativa Bean family (Fabaceae) Description: This herbaceous perennial plant is 1–2½' tall.

A mature plant will tiller from the base, sending up multiple stems that are ascending or erect and branch occasionally. The stems are usually hairless, particularly as they become older.

Glyphosate-tolerant alfalfa (GTA) was developed to withstand over-the-top applications of glyphosate, the active ingredient in Roundup agricultural herbicides. As a part of the safety assessment, GTA (designated J × J) was grown under controlled field conditions at geographically diverse locations within the United States during the and field.

Seed storage proteins were analysed in 27 varieties of alfalfa (Medicago sativa L.); these included five subspecies (glomerata, caerulea, falcata, hemicycla, praefalcata), seven of the nine sources of Medicago germplasm introduced into North America and a sample of additional cultivars.

The protein patterns were remarkably consistent for all of. INTRODUCTION. Alfalfa (Medicago sativa L.) is cultivated mainly for forage production and seed lly, in Turkey, eastern Anatolia farmers produce their seeds directly, harvesting them from the crop regrowth following the first cut o f herbage during the last year of the crop (Serin and Tan, ).Barnes and Sheaffer (), pointed out high-quality certified seeds.

The potential environmental risks of transgene exposure are not clear for alfalfa (Medicago sativa subsp. sativa), a perennial crop that is cross-pollinated by gathered data on feral alfalfa in major alfalfa seed-production areas in the western United States to (1) evaluate evidence that feral transgenic plants spread transgenes and (2) determine environmental and Cited by: Nye, W.

P., and M. Pedersen. Nectar Sugar Concentration as a Measure of Pollination of Alfalfa (Medicago sativa L.). Api. Res.figs. This Article is brought to you for free and open access by the Pollinating Insects Research Unit at [email protected] It has been accepted for inclusion in All PIRU Publications by an authorizedCited by: 1.

The potential environmental risks of transgene exposure are not clear for alfalfa (Medicago sativa subsp. sativa), a perennial crop that is cross-pollinated by by: medicago sativa seed powder derived from crushed seeds of the alfa-alfa (alfalfa), medicago sativa l., leguminosae Features of the beta-amylase isoform system in dry and germinating seeds of alfalfa (Medicago sativa L.).

PubMed:Allelopathic inhibition ofCynodon dactylon Factors affecting the infection of alfalfa seedlings by Ditylenchus. Philip E. Shuler has written: 'The effect of preplant nitrogen fertilization and soil temperature on biological nitrogen fixation and yield of alfalfa (Medicago sativa L.)' -- subject(s): Alfalfa, Effect of nitrogen on Plants, Fixation, Nitrogen, Plants, Effect of nitrogen on, Soil temperature.

There is considerable debate over the capacity of the cell wall polymer lignin to incorporate unnatural monomer units. We have identified Tnt1 retrotransposon insertion mutants of barrel medic (Medicago truncatula) that show reduced lignin autofluorescence under UV microscopy and red coloration in interfascicular fibers.

The phenotype is caused by insertion of Cited by: ABSTRACT Since the s, it has become increasingly difÞcult for U.S. alfalfa seed producers to maintainMegachilerotundata (F.)populationsusedforalfalfa, Medicagosativa L., we monitored M.

rotundata population dynamics and foraging behavior, as well as alfalfa bloom and pollination rates in two Þelds in eastern Oregon.

To discover the effect of environmental factors on pollinator visitation to flowering Medicago sativa, several field experiments were designed to examine the diurnal movement patterns of wild bee species in the Hexi Corridor of northwestern China. Our study results showed that Megachile abluta, M.

spissula, and Xylocopa valga showed unimodal diurnal foraging behavior, whereas Cited by: Usually pollination occurs from bees.

They will land on flowers and some of the pollen will stick to their legs. When they go to another flower, some of the pollen drops off of the bees legs. That is how pollination occurs.

Studies on alfalfa, Medicago sativa, have shown that honey bees vary in their ability to discriminate between white- and purple-flowered plants (Clement, ) but that leaf-cutting bees prefer to Cited by: Factors that affect alfalfa seed yields / (Fort Collins, Colo.: Agricultural Experiment Station of the Agricultural College of Colorado, ), by Philo Kneeland Blinn (page images at HathiTrust) Alfalfa seed growing and the weather with particular reference to conditions in Utah / (Logan: Utah Agricultural College Experiment Station, alfalfa (Medicago sativa L.) perennial, erect.

inflorescence-blue to purple in color, sometimes yellow. leaf-three leaflets, middle leaf with longer petiolule, 1/3 of leaflet is serrated. stipule-united, small. root-large taproot, very deep root system. seed-reddish, yellow or olive green, irregularly reniform (kidney-shaped).

Images of Alfalfa. Although fall dormancy is a strongly expressed trait, genotype by environment interactions are significant. Tests conducted by the University of California show that the G*L*Y interaction is 6x the G*Y and 50x the G*L.

Accurate separation of cultivars and assignment of fall dormancy class (FDC) is best obtained by testing for two years at three locations. In outcrossing crops like alfalfa, various bee species can contribute to pollination and gene flow in seed production fields.

With the increasing use of transgenic crops, it becomes important to determine the role of these distinct pollinators on alfalfa pollination and gene flow. The current study examines the relative contribution of honeybees, three bumble bee species, and three Cited by: 8.alfalfa (Medicago sativa L.) ecotypes, which were collected from the cold regions of Iran, based on some agro morphological traits to help breeders in future breeding strategies and studies.

MATERIALS AND METHODS Materials and data collection: This study was carried out during growing seasons. Sample seeds of. POLLINATION is usually a critical step in crop production in temperate as well as in tropical regions, although some crops set fruit parthenocarpically [i.e., without pollination and thus without seed set, e.g., in banana, Musa spp., and pineapple, Ananas comosus (L.) Merr.] and although progress has been made with vegetative propagation via cell culture (e.g.