Central Agricultural University

About: Central Agricultural University is a education organization based out in Imphal, Manipur, India. It is known for research contribution in the topics: Population & Agriculture. The organization has 1116 authors who have published 1157 publications receiving 9217 citations.

A 1.84-Mb region on rice chromosome 2 carrying SPL4, SPL5 and MLO8 genes is associated with higher yield under phosphorus-deficient acidic soil.

Abstract: Phosphorus (P) deficiency is one of the major limiting factors for rice productivity with only one locus (PSTOL1) available for field based application. A biparental mapping population (F6) derived from two P deficiency tolerant genotypes (Sahbhagi Dhan (SD) (PSTOL1+) and Chakhao Poreiton (CP) (PSTOL1−)), in which, transcriptome data generated from our lab had previously shown existence of diverse mechanisms was used to identify novel regions for better yield under lowland acidic soils. Phenotyping at F4, F5 and F6 generations revealed significant correlation between traits like tiller number at 30 days (TN 30), tiller number at 60 days (TN 60), filled grains (FG), percent spikelet fertility (SF%), panicle number (PN) and grain yield per panicle (GYPP) and also association with better yield/performance under low P acidic soil conditions. Through selected genotyping on a set of forty superior and inferior lines using SSR, candidate gene–based and SNP polymorphic markers, 5 genomic regions associated with various yield-related traits were identified. Marker trait association studies revealed 13 markers significantly associated with yield attributing traits and PUE under lowland acidic field conditions. Chi-square and regression analyses of markers run on the entire population identified seven and six markers for SF% and GYPP, respectively, and two for biological yield with positive allele derived from SD which constitute a novel 1.847-Mb region on chromosome 2 flanked by two markers RM12550 and PR9-2. Expression analysis of 7 candidate genes lying within this region across SD, CP and two low P susceptible rice genotypes has revealed that expression of four genes including SPL4, SPL5, ACA9 and MLO8 is significantly upregulated only in SD under low P conditions. In CP, there is low expression of MLO8 under low P conditions, whereas SPL4, SPL5 and Os02g08120 are downregulated. In the case of the two susceptible genotypes, there is no expression of Os02g08120 either in optimum or limiting conditions. Sequence data across a panel of 3024 rice genotypes also suggests that there is polymorphism for these differentially expressed genes. The genes and underlying markers identified on chromosome 2 will be key to imparting tolerance to low P in diverse genetic backgrounds and for marker-assisted selection for higher yield under lowland acidic conditions.

Prevalence of gastrointestinal parasites in captive non-human primates of zoological gardens in North-Eastern region of India

Abstract: The increasing emergence of wildlife diseases with the possibility of ecological threats as well as domestic animals and human health has prompted the importance of understanding disease dynamics a...

Life Cycle of a New Bosminid Cladocera: Bosmina (Bosmina) tripurae (Korinek, Saha, and Bhattacharya, 1999)

Abstract: Bosmina tripurae was first reported as a new species of subgenus Sinobosmina (Cladocera, Bosmina) in 1999 in Tripura, India. However, no further research work was done on this species. The present investigation has been carried out to provide the basic knowledge of life history aspects of B. tripurae on its length increment, instar number, instar duration, fecundity, hatching success, life span and embryonic development. The species was cultured in the laboratory for ten generations. The experiment was conducted under controlled conditions at 20 ± 0.29 °C and animals were fed with Chlorella sp. (2 × 104 cells ml−1). Parthenogenetic female showed three preadult and ten adult instar stages. Female produced around 22 eggs in its total life span of about 25 days. The length of first instar juvenile was 261 μm and the last adult instar was 590 μm. Duration of preadult instars ranged from 1.05 to 1.27 days whereas adult instars ranged from 1.93 to 2.30 days. Age at first reproduction was about 3.65 days. The species showed maximum ten clutches in the present study however, the sixth clutch produced and released significantly (P < 0.05) higher number of both eggs and neonates as compared to other clutches. In laboratory condition, about 89 % eggs were hatched out into neonates. The gestation period of the embryo was around 2.03 days with 12 developmental stages in the brood pouch of the mother.

Integration of different sources of organic manure and micro-nutrients on growth, yield and quality of potato (Solanumtuberosum L.) grown under new alluvial soil condition

Abstract: Field experiment was conducted during rabi season of 2009-10 and 2010-11, to study the effect of application of different sources organic manure and micro-nutrients on growth, productivity and quality of potato (Solanumtuberosum L.) grown under alluvial soil. The different sources of organic and micronutrients were integrated into 8 possible treatments viz. RDF (NPK @ 200 :150 :150 kg ha-1) , 50% of RDF + well decomposed FYM @ 10t ha-1, 50% of RDF + Well powder neemcake @ 0.5t ha-1,RDF+ Zinc sulphate @ 20kg ha-1as soil application, RDF + ammonium molybdate @ 1kg ha-1as soil application, RDF + sodium tetraborate @ 1kg ha-1as soil application, RDF + tuber soaking with 40g inc sulphate + 10g ammonium molybdate + 10g sodium tetraborate, RDF + foliar spray of 1% KnO3 salt. All the treatments resulted in improvement of growth and tuber yield characteristics, out of these treatments where organic sources of nutrient were integrated registered significantly maximum effect. Highest leaf area index, leaf area duration, dry matter production, tuber bulking rate and tuber yield in potato were recorded in the treatment 50% recommended dose of NPK + 10t FYM ha-1, while the lowest was observed in 100 % inorganic fertilizer treatment (RDF). Organic treatment were also in favour of producing medium and large size tuber, whereas, micronutrient were in favour of producing extra large size tuber. Highest value of starch and reducing sugar content were also recorded under the treatment where the crop received organic manure.

Constraints and Drudgery in Makhana Cultivation

Abstract: Makhana is an aquatic crop with immense export potential and it is an important source of income for poor fishermen. Out of total makhana produced in India, more than 80% makhana is produced in Bihar alone. Although it is a high value crop but farmers associated with makhana are still very poor. The study is based on information obtained from 400 farmers of two major makhana growing districts, namely, Madhubani and Katihar of Bihar; to identify the constraints associated with makhana cultivation under different eco-systems. Since makhana cultivation is labour intensive, attempts were also made to know the drudgery involved in different operations of makhana cultivation. Based on focus group discussions with the different stakeholders, seven main constraints were identified for preferential ranking by the makhana growers. Lack of ownership of the pond/land was the major constraint followed by lack of scientific knowledge of cultivation and highly skilled operations involved in makhana cultivation in both the district. Harvesting was found to be the most difficult operation in makhana cultivation as reported by farmers of Katihar and Madhubani.