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Most often a genetic linkage map is prepared using populations obtained from two highly diverse genotypes.However the markers from such a map may not be useful in a breeding program as these markers may not be polymorphie among the varieties used in breeding.…… 《分子植物育种》2007,5(2):219-220
Most often a genetic linkage map is prepared using populations obtained from two highly diverse genotypes. However, the markers from such a map may not be useful in a breeding program as these markers may not be polymorphic among the varieties used in breeding. For the past nine years, intraspecific maps have been gaining importance and such maps based on Swiss （PaiUard et al., 2003）, Japanese （Suenaga et al., 2005）, Australian （Chaimcrs et al., 2001） wheat varieties arc available. A map based on Indian wheat varieties however has not been reported. We constructed a genetic linkage map based on a cross between two Indian bread wheat （Triticum aestivum L.） varieties, Sonalika and Kalyansona. One hundred and fifty F2 individuals were analyzed for arbitrarilyprimed polymerase Chain reaction （AP-PCR）, random amplified polymorphic DNA （RAPD）, inter simple sequence repeats （ISSR）, Sequence Tagged Microsatelhte Sites （STMS）, Amplified Fragment Length Polymorphism （AFLP） markers, seed storage proteins and known genes. A linkage map was constructed consisting of 236 markers and spanning a distance of 3 639 cM with 1 211.2 cM for A genome, 1 669.2 cM for B genome, 192.4 cM for D genome and 566.2 cM for unassigned groups, 相似文献
2.
There are many wild species of pigeonpea which are endemic to Australia. These wild species are cross incompatible with cultivated
species of Indian origin. Cajanus acutifolius is one such species which does not easily cross with cultivated pigeonpea. Interspecific pollinations lead to hybrid seeds
which were semi-shrivelled. Very few seeds germinated to give rise to F1 plants. Backcrossing the hybrid plants to C. cajan,
the male parent, gave rise to aborting seeds which did not germinate in vivo hence BC1 plants are obtained after saving the
aborting embryos in vitro. BC1 plants showed normal meiotic pairing, but had low pollen fertility. The reasons for embryo abortion and low pollen fertility
in spite of normal meiosis could be due to the effect of wild species cytoplasm.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
3.
Arachis glabrata Benth, variety glabrata collector GK 10596 (PI276233; ICG 8176) belonging to section Rhizomatosae has resistance to rust, late leaf spot and viral diseases. A. hypogaea L. cv MK 374 (section Arachis) is susceptible to rust, late leaf spot and to the viral diseases peanut stripe, peanut mottle and peanut bud necrosis. Hybrids
between A. hypogaea cv MK 374 and A. glabrata were produced after inter specific pollinations and embryo culture. The hybrids produced had morphological characters of
both parents plus floral abnormalities not seen in either parent. It was possible to identify the hybrids by esterase isozyme
analysis when still in culture. Cytological research showed variable chromosome association and also homeology between the
genomes of A. hypogaea and A. glabrata. The hybrids inherited resistance to rust, late leaf spot, peanut bud necrosis and peanut stripe diseases from the pollen
parent A. glabrata.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Epiphyte mats (contiguous pieces of live and dead epiphytes perched upon branches of trees) are a conspicuous component of tropical cloud forests and harbor diverse meso- and microarthropod communities. We investigated differences in arthropod assemblage structure between the vegetative (green) and humic (brown) portions of epiphyte mats in a lower montane forest in Monteverde, Costa Rica. Because of qualitative differences between the two substrates, we hypothesized that they would support different arthropod communities and that variation in community parameters would be linked to the quantity of brown material present in a mat sample. The green fraction contained twice as many individuals and species per gram dry mass than the brown fraction. Morphospecies composition was very similar between green and brown portions, but the relative abundance of several taxa differed significantly between the substrates. Contrary to our prediction, total arthropod abundance and richness in a sample were not correlated with the proportion of brown material present. In laboratory trials, the most common morphospecies of oribatid mite in this system showed a preference for brown substrates. 相似文献
6.
Nalini Mallikarjuna Deepak R. Jadhav Kanaka Reddy Fatema Husain Kumkum Das 《European journal of plant pathology / European Foundation for Plant Pathology》2012,132(1):17-21
Cultivated groundnut is susceptible to late leaf spot (LLS) caused by Phaeoisariopsis personata [(Berk. & M.A. Curtis) Aex] and resistance is low to moderate in the primary gene pool of groundnut. Closely related wild
species in the secondary gene pool are highly resistant to the disease. All the closely related Arachis species are diploid and cultivated groundnut is a tetraploid. Utilization of diploid Arachis species to transfer LLS resistance is time consuming and cumbersome. New sources of Arachis hypogaea (also called synthetic groundnut) were developed at ICRISAT. These are tetraploids and the present investigation has shown
that they are resistant to LLS. 相似文献
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Genome-wide analysis of root hair-preferential genes in rice 总被引：1，自引：0，他引：1
9.
Canopy-held organic matter develops into a distinct soil system separate from the forest floor in wet temperate coniferous forests, creating a natural microcosm. We distinguished between fungal and bacterial components of the decomposer community in one site with Maple (Acer macrophyllum) and one site with Alder (Alnus rubra) by using direct measurements of growth; acetate incorporation into ergosterol, and leucine incorporation for fungi and bacteria, respectively. The higher organic matter content of the canopy soils correlated with higher fungal growth. The relative importance of fungi, indicated by fungal:bacterial growth ratio, was higher in the canopy soil of the Maple site, while there was no difference in the Alder site. The high C:N ratio of the Maple canopy soil likely contributed to this difference. These results demonstrate a divergence between canopy and forest floor that should be explored to gain insights in decomposer ecology using the natural microcosms that the canopy soils provide. 相似文献
10.
R. Rama Praba Nalini M. Balusamy C. Chinnusamy 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2017,67(3):217-222
To assess the persistence and dissipation kinetics of sulfentrazone in soil, terminal residues in soybean and carryover effect on bioindicator species, field experiment was carried out under Indian tropical conditions. The sulfentrazone was applied at 360, 480 and 720?g a.i. ha?1 rates as pre-emergence herbicide. Its residues in soil and in soybean at harvest were analyzed by high pressure liquid chromatography. Results showed that the sulfentrazone dissipation in soil followed first-order reaction kinetics with the half-lives of 5.5 to 14.8 days. Terminal residue in shoot and grain showed that sulfentazone at 360?g ha?1 can be safely applied for weed control in soybean since there was no phytotoxicity injury to the crop. The residue in soybean grain was within the safe limits (0.05?µg g?1) as proposed by US. However, the detection of sulfentrazone residue in soil at harvest and carryover injury to bioindicator signified the risk for crops in succession. Hence the use of this herbicide in soil with low organic matter and coarse texture is questionable as it is highly mobile. Further biomagnifications of sulfentrazone residue in soil and crop produce under continuous use and interaction of climatic variables and soil properties on its persistence, sorption and leaching behavior need to be investigated. 相似文献