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 Curently online :  21
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Wednesday, 2014/12/17 | 08:08:44

High temperature tolerance is an important component of adaptation to arid and semiarid cropping environment in chili pepper. Two experiments were carried out to study the genetic variability among chili pepper for heat tolerance and morphophysiological traits and to estimate heritability and genetic advance expected from selection. There was a highly significant variation among the genotypes in response to high temperature (CMT), photosynthesis rate, plant height, disease incidence, fruit length, fruit weight, number of fruits, and yield per plant.

Tuesday, 2014/12/16 | 08:49:59

The non-protein amino acid β-aminobutyric acid (BABA) is known to be a priming agent for a more efficient activation of cellular defence responses and a potent inducer of resistance against biotic and abiotic stresses in plants. Nevertheless, most of the studies on priming have been carried out in Arabidopsis. In potato, the effect of BABA was demonstrated only on biotic stress tolerance. We investigated the effect of BABA on the drought tolerance of potato and found that soil drenched with BABA at a final concentration of 0.3 mM improves the drought tolerance of potato.

Monday, 2014/12/15 | 08:30:12

Infectious diseases cause huge crop losses annually. In response to pathogen attacks, plants activate defense systems that are mediated through various signaling pathways. The salicylic acid (SA) signaling pathway is the most powerful of these pathways. Several regulatory components of the SA signaling pathway have been identified, and are potential targets for genetic manipulation of plants' disease resistance. However, the resistance associated with these regulatory components is often accompanied by fitness costs; that is, negative effects on plant growth and crop yield

Saturday, 2014/12/13 | 06:25:18

Pigeonpea (Cajanus cajan) is the sixth most important legume crop grown on ~5 million hectares globally. Determinacy is an agronomically important trait selected during pigeonpea domestication. In the present study, seven genes related to determinacy/flowering pattern in pigeonpea were isolated through a comparative genomics approach. Single nucleotide polymorphism (SNP) analysis of these candidate genes on 142 pigeonpea lines found a strong association of SNPs with the determinacy trait for three of the genes.

Friday, 2014/12/12 | 08:07:45

Studies have identified thousands of common genetic variants associated with hundreds of diseases. Yet, these common variants typically account for a minority of the heritability, a problem known as “missing heritability.” Geneticists recently proposed indirect methods for estimating the total heritability attributable to common variants, including those whose effects are too small to allow identification in current studies.

Thursday, 2014/12/11 | 08:11:23

In many plants, seasonal flowering is a crucial aspect of maximizing reproductive fitness. Changes in day length (or photoperiod) provide the most reliable cue that enables plants to anticipate approaching seasonal variation in the surrounding environment. The induction of the FLOWERING LOCUS T (FT) gene controlled by the light-stabilized CONSTANS (CO) protein is the key mechanism for photoperiodic flowering in Arabidopsis thaliana.

Wednesday, 2014/12/10 | 08:13:32

RNA-directed DNA methylation (RdDM) has traditionally been associated with transposable elements, but more recent studies have shown that RdDM also targets regulatory regions of protein-coding genes. Moreover, DNA methylation in Arabidopsis appears to be more dynamic than previously believed and may correlate with transcriptional responses to environmental stresses, such as pathogens.

Tuesday, 2014/12/09 | 08:00:42

Imported tomato fruits infected with Tomato yellow leaf curl virus (TYLCV) were identified on the market in northern Europe using paper-based FTA Classic Cards (Whatman), polymerase chain reaction (PCR) and partial DNA sequence analysis. Trade tomatoes originating from southern Europe, Africa and the Middle East were sampled in Estonia and Sweden, and tested for infection with begomoviruses. Out of 100 batches analysed with five fruits sampled in each batch (58 batches from Estonia and 42 from Sweden), 20 batches were positive (16 from Estonia and four from Sweden).

Monday, 2014/12/08 | 08:40:16

This study evaluates resistance to witches’ broom disease in flower cushions of Theobroma cacao under field conditions. The aim was to determine optimal inoculation methods to evaluate the disease incidence using flower cushions in the field. A segregating mapping population of 580 trees (cultivar TSH 1188 9 CCN 51) was analysed under two field conditions: high and low inoculum levels (in different years), corresponding respectively to trees with or without dried witches’ brooms hanging on the trees and producing basidiocarps.

Sunday, 2014/12/07 | 06:11:55

Eyespot is an economically important stem base disease of wheat caused by the soilborne fungal pathogens Oculimacula yallundae and Oculimacula acuformis. The most effective method of controlling the disease is host resistance. However, there are only three genetically characterized resistances in wheat varieties and further sources of resistance are required. Previous studies have identified resistances in wild relatives, but use of these resistances has been limited by linkage drag with deleterious traits exacerbated by low rates of recombination.

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