27 research outputs found
Studies on Epidemiology and Prediction of Soybean Mosaic Virus
-Some epidemiological factors of SMV were studied in Jinan, Shandong Province from 1984 to 1989. The results indicated that the resistance of soybean cultivars and the amount of primary inoculum sources dominated the dynamic aspects of SMV epidemics. It wOriginating text in Chinese.Citation: Luo, Ruiwu, Shang, Youfen, Yang, Chongliang, Zhao, Jiuhua, Li, Changsong. (1991). Studies on Epidemiology and Prediction of Soybean Mosaic Virus. Journal of Plant Protection / Acta Phytophylacica Sinica, 18(3), 267-271
Study on Biology and Control of Aphis Glycines
Results of laboratory and field experiments showed that Aphis glycines could reproduce 18-22 generations per year in Jinan, and that generation period, reproductive period and reproduction rate were dependent on temperature. The aphids migrated with two peaks -- in the first ten days of June and between the last ten days of July and first ten days of August. The insect population on soybean plants was low during seedling stage and peaked in the first ten days of August. The aphid was controlled effectively by furrow application of carbofuran (Furaden) and aldicarb (Temik) and by spray application of omethoate (Dimethoate - met) and fenvalerate (Sumicidin).Originating text in Chinese.Citation: Li, Changsong, Luo, Ruiwu, Yang, Congliang, Shang, Youfen, Zhao, Jiuhua, Xin, Xiangqi. (2000). Study on Biology and Control of Aphis Glycines. Soybean Science, 19(4), 337-340
Genome sequence of the cultivated cotton <i>Gossypium arboreum</i>
The complex allotetraploid nature of the cotton genome (AADD; 2n = 52) makes genetic, genomic and functional analyses extremely challenging. Here we sequenced and assembled the Gossypium arboreum (AA; 2n = 26) genome, a putative contributor of the A subgenome. A total of 193.6 Gb of clean sequence covering the genome by 112.6-fold was obtained by paired-end sequencing. We further anchored and oriented 90.4% of the assembly on 13 pseudochromosomes and found that 68.5% of the genome is occupied by repetitive DNA sequences. We predicted 41,330 protein-coding genes in G. arboreum. Two whole-genome duplications were shared by G. arboreum and Gossypium raimondii before speciation. Insertions of long terminal repeats in the past 5 million years are responsible for the twofold difference in the sizes of these genomes. Comparative transcriptome studies showed the key role of the nucleotide binding site (NBS)-encoding gene family in resistance to Verticillium dahliae and the involvement of ethylene in the development of cotton fiber cells.Genetics & HereditySCI(E)[email protected]; [email protected]; [email protected]
Search for light dark matter from atmosphere in PandaX-4T
We report a search for light dark matter produced through the cascading decay
of mesons, which are created as a result of inelastic collisions between
cosmic rays and Earth's atmosphere. We introduce a new and general framework,
publicly accessible, designed to address boosted dark matter specifically, with
which a full and dedicated simulation including both elastic and quasi-elastic
processes of Earth attenuation effect on the dark matter particles arriving at
the detector is performed. In the PandaX-4T commissioning data of 0.63
tonneyear exposure, no significant excess over background is observed.
The first constraints on the interaction between light dark matter generated in
the atmosphere and nucleus through a light scalar mediator are obtained. The
lowest excluded cross-section is set at for
dark matter mass of MeV and mediator mass of 300 MeV. The
lowest upper limit of to dark matter decay branching ratio is
A Search for Light Fermionic Dark Matter Absorption on Electrons in PandaX-4T
We report a search on a sub-MeV fermionic dark matter absorbed by electrons
with an outgoing active neutrino using the 0.63 tonne-year exposure collected
by PandaX-4T liquid xenon experiment. No significant signals are observed over
the expected background. The data are interpreted into limits to the effective
couplings between such dark matter and electrons. For axial-vector or vector
interactions, our sensitivity is competitive in comparison to existing
astrophysical bounds on the decay of such dark matter into photon final states.
In particular, we present the first direct detection limits for an axial-vector
(vector) interaction which are the strongest in the mass range from 25 to 45
(35 to 50) keV/c