2 edition of Germination and growth characteristics of five accessions of jointed goatgrass (Aegilops cylindrica) found in the catalog.
Germination and growth characteristics of five accessions of jointed goatgrass (Aegilops cylindrica)
Jean Ann Gleichsner
Written in English
|Statement||by Jean A. Gleichsner.|
|The Physical Object|
|Pagination||133 leaves, bound :|
|Number of Pages||133|
Goatgrass, (genus Aegilops), genus of about 20 species of grasses (family Poaceae) native to Eurasia and North Africa. Several goatgrass species are considered to be agricultural weeds; they often grow with wheat and other cereal crops, where their eradication is difficult. Common bread wheat. Jointed Goatgrass Biology Jointed goatgrass is a winter annual grass weed that closely mimics the life cycle of winter wheat, and has a similar life cycle to other grass weeds of importance such as downy brome Figure 1. Collar region and seed of jointed goatgrass .
proximately March 1. Jointed goatgrass densities were counted within three randomly placed m2 quadrats in each plot when jointed goatgrass resumed growth in the spring. Wheat and jointed goatgrass plant heights were re-corded at 2-wk intervals beginning just before wheat stem elongation and ending with anthesis. Plant heights were de-. Seefeldt SS, Zemetra R, Young FL, Jones SS () Production of herbicide-resistant jointed goatgrass (Aegilops cylin-drica) X wheat (Triticum aestivum) hybrids in the field by natural hybridization. Weed Scie Seibert AC, Pearce RB () Growth analysis of weed and crop species with reference to seed weight. Weed Scie
program evaluating the use of the Ph1 of wheat and Gc of jointed goatgrass (Aegilops cylindrica) to transfer genes from jointed goatgrass into wheat. An additional round of backcrossing was done on lines originating from either a 34 chromosome hybrid or a 35 chromosome hybrid. Jointed goatgrass is a winter annual that is native to southern Europe and Russia. The plants can grow as a single or multiple stems or tillers, it will grow 15 to 30 inches tall. Leaves are simple and alternate. The auricles of the leaf are at the base. Leaf blades are hairy and are 1/8 to 1/4 of an inch in width.
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Attribute Name Values; Creator: Gleichsner, Jean A. Abstract: Laboratory and field studies were conducted at Pendleton, Oregon, during and to evaluate germination and growth characteristics of five jointed goatgrass (Aegilops cylindrica Host) accessions collected from sites in Echo, Ione, Pendleton, Condon, and Elgin, by: 6.
Abstract. Graduation date: Laboratory and field studies were conducted at Pendleton, Oregon, during and to evaluate germination and growth characteristics of five jointed goatgrass (Aegilops cylindrica Host) accessions collected from sites in.
The after-ripening period for jointed goatgrass seed was quantified, and the effects of germination conditions and spikelet structures on jointed goatgrass seed germination were studied. As the duration of after-ripening increased, jointed goatgrass seeds germinated earlier and at faster rates, and the final germination percentage increased compared to non-after-ripened by: germination and growth characteristics of five jointed goatgrass (Aegilops cylindrica Host) accessions collected from sites in Echo, Ione, Pendleton, Condon, and Elgin, Oregon.
Spikelets were germinated for 27 days at room (23 + 2 C) and constant (7, 18, 23, 29, and 38 C) temperatures after storage for 0 to 12 months. The germination pattern. Germination and Growth Characteristics of Five Accessions of Jointed Goatgrass (Aegilops cylindrica). Thesis. Oregon State University, Corvallis, OR.
In summary, seed germination is the process of a fertilized plant ovary, or seed, developing into a mature plant. Seed germination starts with imbibition, when the seed takes in water from the soil. Germination responses of jointed goatgrass and wheat seed were recorded over 14 d at 5/5, 15/10, 15/15, 25/15, 25/25, and 30/20 C day/night temperatures and a h photoperiod.
Because jointed goatgrass spikelets often contain two seed, primary and secondary seed germination. The impact of the bacteria on JGG accession growth was also tested.
Jointed goatgrass accessions were collected from six varied sites in the western US: Pullman, LaCrosse, Ritzville and Wilbur, WA, Pendleton, OR, and Fort Collins, CO to represent JGG that possess different growth characteristics from various dryland wheat producing regions.
Suppression of jointed goatgrass (JG) After treatment, the level of inhibition of JG in winter wheat (– plants m −2) by the three bacterial strains (Fig.
4b) mirrored the levels of inhibition observed for DB over the course of this study (Fig. 4a). P.f. Germination responses of jointed goatgrass and wheat seed were recorded over 14 d at 5/5, 15/10, 15/15, 25/15, 25/25, and 30/20 C day/night temperatures and a h photoperiod.
Jointed Goatgrass Secondary Seed and Wheat Seed Germination. Jointed goatgrass secondary seed germinated when exposed to all temperature regimes ranging from 5/5 to 30/ 20 C ().Germination onset (L) and maximum percent (M) were influenced by incubation temperature, but rate (K) was not affected by d goatgrass secondary seed germinated within 6 d at.
Weedy characteristics: Some seeds germinate immediately after they are shed. A single plant can produce up to 3, seeds. Their persistent thatch can suppress native species. Control strategies: Jointed goatgrass populations in the home landscape are.
Chemical Control. Selective chemical control of jointed goatgrass in conventional winter wheat is not available to growers. The genetic similarities and similar life cycles between wheat and jointed goatgrass have made selective herbicide development very difficult.
However, BASF has developed the Clearfield wheat system, which used conventional breeding methods to identify a gene that. Jointed Goatgrass is a common weed in wheat fields. In the vegetative stage, Goatgrass and wheat are pretty similar except – jointed Goatgrass will have pronounced hairs on the sheath and leaf margins.
Wheat sheaths and leaf margins are hairless (see photo). Jointed Goatgrass seed heads are. stage, Jointed goatgrass looks similar to winter wheat. The hairs on the jointed goatgrass will be the key diagnostic fea-ture; winter wheat does not have these hairs.
J ointed goatgrass looks very similar to winter wheat in the younger stages of growth and hybridizes with winter wheat. The presence of. Specific knowledge about the dormancy, germination, and emergence patterns of weed species aids the development of integrated management strategies.
The after-ripening period for jointed goatgrass seed was quantified, and the effects of germination conditions and spikelet structures on jointed goatgrass seed germination were measured.
As the duration of after-ripening increased, jointed. jointed goatgrass jointgrass This plant can be weedy or invasive according to the authoritative sources noted plant may be known by one or more common names in.
Jointed Goatgrass (continued) Prevention: Since jointed goatgrass only reproduces by seed, preventative tactics should be aimed at avoiding the spread of seed.
Jointed goatgrass is classed as a Similarities in physiology and growth habit between prohibited Noxious Weed in the Seeds Act and Regulations and thus using certified seed will prevent.
Ten jointed goatgrass plants per square yard can reduce cereal crop yields by 30 to 50%. Jointed goatgrass seed is a contaminant in ce-real grain seed crops where it alters their milling characteristics and reduces the value of the grain.
From L to R: wheat, wheat x jointed goatgrass hybrids (3 hybrid spikelets shown) and pure jointed goatgrass. Description: General Description: Jointed goatgrass is a winter annual grass vegetatively similar to wheat in the seedling have upright stems that branch at the base, growing to around feet tall.
Flower Description: It has a narrow, non-spreading spike of flowers with the appearance of a series of joints being stacked upon top of each other. A key to managing jointed goatgrass is understanding €the survival €of €jointed goatgrass seeds in the soil.
After one year, 80% or more €of €jointed goatgrass seeds may still be viable. After two years, 20% may be viable, and after three years, 5% may be viable (Figure 6). This is in sharp contrast to downy.Field and laboratory trials conducted on silty clay soil at Fargo (North Dakota) in revealed that seed survival of jointed goatgrass over 2 years was related to cyclical seasonal changes in its ability to germinate, to field emergence, seasonal precipitation and air temp.
The ability of seeds to germinate was studied by incubating spikelets under constant, defined incubation conditions.four accessions (S1, S2, R1 and R2) seeds from the intermediate part of the inflorescence, i.e. excluding both the basal and apical position, were considered (table 1).
Table 1. Characteristics of five accessions of Lolium rigidum used in the assessment. Accession Location Biotype Seed position on spike S1 Lleida Susceptible Intermediate.