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 - Study on rice breeding for export and domestic consumption(2005)

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Tuesday, 2019/12/17 | 08:04:24

Root cracking is a severe physiological disorder that significantly decreases the yield and commercial value of radish. The genetic and physiological mechanisms underlying this root cracking disorder have not been characterized. In this study, quantitative trait loci (QTLs) putatively associated with radish root cracking were mapped. Ten QTLs were distributed in six linkage groups, among these QTLs, ‘RCr1’ in LG1 was detected over 3 consecutive years and was considered to be a major QTL for root cracking. The QTL ‘RCr1’ was responsible for 4.47–18.11% of variance in the root cracking phenotype

Monday, 2019/12/16 | 08:21:52

The rice blast caused by the fungus Magnaporthe oryzae is one of the most devastating diseases of rice and can lead to complete failure of the crop under severe cases. The first step in breeding for blast resistance in rice is therefore to identify the novel sources of resistance and cataloguing different blast resistant genes in these genotypes

Sunday, 2019/12/15 | 07:18:55

Plants employ sophisticated molecular machineries to fine-tune their responses to growth, developmental, and stress cues. Plants cellular response influences gene expression through regulating processes like transcription and splicing. To increase the genome coding potential and further regulate the expression, pre-mRNA is alternatively spliced. Serine/Arginine-rich (SR) proteins, a family of pre-mRNA splicing factors, recognize splicing cis-elements and regulate both constitutive and alternative splicing.

Saturday, 2019/12/14 | 09:07:03

Plants need to maintain a low Na+/K+ ratio for their survival and growth when there is high sodium concentration in soil. Under these circumstances, the high affinity K+ transporter (HKT) and its homologs are known to perform a critical role with HKT1;5 as a major player in maintaining Na+ concentration. Preferential expression of HKT1;5 in roots compared to shoots was observed in rice and rice-like genotypes from real time PCR, microarray, and RNAseq experiments and data.

Friday, 2019/12/13 | 08:06:01

Drought is a major constraint in some rice-growing areas of the United States. Its impact is most severe at the reproductive stage resulting in low grain yield. Therefore, assessment of genetic and phenotypic variation for drought tolerance in US rice germplasm is necessary to accelerate the breeding effort.

Thursday, 2019/12/12 | 08:35:45

Blight-resistant rice lines are the most effective solution for bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo). Key resistance mechanisms involve SWEET genes as susceptibility factors. Bacterial transcription activator-like (TAL) effectors bind to effector-binding elements (EBEs) in SWEET gene promoters and induce SWEET genes. EBE variants that cannot be recognized by TAL effectors abrogate induction, causing resistance

Wednesday, 2019/12/11 | 08:08:09

A novel recessive bacterial blight resistance locus designated as a xa-45(t) was identified from Oryza glaberrima accession IRGC 102600B, transferred to O. sativa and mapped to the long arm of chromosome 8 using ddRAD sequencing approach. The identified QTL spans 80 kb region on Nipponbare reference genome IRGSP-1.0 and contains 9 candidate genes.

Tuesday, 2019/12/10 | 08:28:16

Soybean mosaic virus (SMV) causes significant reductions in soybean yield and seed quality. Because seedborne infections can serve as primary sources of inoculum for SMV infections, resistance to SMV seed transmission provides a means to limit the impacts of SMV

Monday, 2019/12/09 | 08:39:03

Transposons are controlled by epigenetic regulations. To obtain newly activated autonomous elements of Dart1, a DNA transposon, in rice, seeds of a stable pale yellow leaf (pyl-stb) mutant caused by the insertion of nDart1-0, a nonautonomous element in OsClpP5, were treated with 5-azaC, a demethylating agent. In the 5-azaC-treated M1 plants, 60–70% of the plants displayed variegated pale yellow leaf (pyl-v) phenotype, depending on the concentration of 5-azaC used, suggesting that inactivated Dart1

Sunday, 2019/12/08 | 06:57:19

Maize grain yield is determined by agronomically important traits that are controlled by interactions among and between genes and environmental factors. Considerable efforts have been made to identify major quantitative trait loci (QTLs) for yield-related traits; however, few were previously isolated and characterized in maize. In this study, we divided a QTL for kernel row number (KRN), qKRN5, into two tightly linked loci, qKRN5a and qKRN5b, using advanced backcross populations derived from near-isogenic lines.

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