Growth Responses to Varying Zinc Activities in Rice Genotypes Differing in Zn Efficiency and Zn Density

Soil zinc (Zn) deficiency limits crop growth and yield besides its low concentration in grain and straw. Growing of Zn efficient cultivars with high crop yield at low Zn supply would represent a sustainable approach to crop production. Therefore, to evaluate Zn efficiency of rice genotypes, twenty eight different rice genotypes were evaluated under various treatments like three levels of Zn viz. low (without Zn), medium (10 kg Zn ha-1 soil) and high (20 kg Zn ha-1 soil + three foliar sprays of 0.5% Zn). Zinc efficiency index of all genotypes ranged from 65.5 to 102.6 % and Zn uptake efficiency ranged from 53.8 to 107 % with a mean value of 87.1 and 76.5 %. Cultivar GR-101 was having the highest Zn efficiency index as well as Zn efficiency compared to other genotype. Based on grain yield and Zn efficiency, the genotypes Ashoka-20, Narmad, GR-12, GR-3, GR-1 and GR-2 were classified as efficient and responsive, genotypes GR- 11, SLR -51214. GAUR-10 and GR-13 as efficient and non responsive, whereas, genotypes GR-101, GR-104, GR-102 and Lalkad as inefficient and responsive. The Gurjari, AAUDR-1, K-Kamod, GR-9, GR-5, P-2003 SK-20 and GR-7 genotype were classified as inefficient and non responsive. The efficient and responsive genotypes are most desirable as they would produce higher yield under low Zn concentration in soil and responded well under external application of Zn sources.

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Effect of Introgression of Pup1 Locus on Rice Seedling under Phosphorus Deficiency

Jurnal AgroBiogen ◽

10.21082/jbio.v14n2.2018.p97-104 ◽

2019 ◽

Vol 14 (2) ◽

pp. 97

Author(s):

Nurul Hidayatun ◽

Joko Prasetiyono

Keyword(s):

Leaf Growth ◽

Phosphorus Deficiency ◽

Snp Markers ◽

P Element ◽

P Availability ◽

Growth Responses ◽

Genetic Composition ◽

P Deficiency ◽

Rice Genotypes ◽

The Impact

<p>The lack of soil-phosphorus (P) element will result in plant growth retardation. Plants could survive in P deficiency stress by increasing the ability of P uptake or by increasing the efficiency in the P utilization. The aims of this study were to understand genetic composition of rice genotypes possessing Pup1 locus and to know root and leaf growth responses at different P availability condition. The three rice genotypes (IR74, IR74-Pup1, and Kasalath) were analyzed for their genetic composition using SNP markers. The phenotypic experiment was arranged using a Completely Randomized Design with four replications and performed hydroponically in nutrient solution with different availability of P. The result showed that IR74-Pup1 had 84.4% similarities to its parent (IR74) with 13.6% of donor segments, where the Pup1 locus located. The influence of Pup1 locus<br />introgression on total length, surface area, diameter, and volume of the root varied at each growth stage. IR74 and IR74-Pup1 had root and leaf growth restriction on low P, but Pup1 locus introgression showed better growth performance, both in normal P and in low P conditions. The introgression of Pup1 locus increases plant ability to reduce the impact of growth inhibition<br />caused by P deficiency. </p>

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Phosphorus fertilization in inbred and hybrid rice

Dhaka University Journal of Biological Sciences ◽

10.3329/dujbs.v19i2.8962 ◽

1970 ◽

Vol 19 (2) ◽

pp. 181-187

Author(s):

MR Islam ◽

PK Saha ◽

SK Zaman ◽

MJ Uddin

Keyword(s):

Grain Yield ◽

Key Words ◽

Hybrid Rice ◽

Phosphorus Fertilization ◽

Phosphorus Fertilizer ◽

Yield Difference ◽

P Balance ◽

Rice Genotypes ◽

Boro Rice

Five phosphorus rates (0, 5, 10, 20 and 30 kg P/ha) were tested with four rice genotypes in Boro (BRRI dhan36, BRRI dhan45, EH1 and EH2) and T. Aman (BRRI dhan30, BRRI dhan49, EH1 and EH2) season. Phosphorus rates did not influence grain yield irrespective of varieties in T. Aman season while in Boro season P response was observed among the P rates. Application of P @ 10 kg/ha significantly increased the grain yield. But when P was applied @ 20 and 30 kg P/ha, the grain yield difference was not significant. The optimum and economic rate of P for T. Aman was 20 kg P/ha but in Boro rice the optimum and economic doses of P were 22 and 30 kg/ha, respectively. Hybrid entries (EH1 and EH2) used P more efficiently than inbred varieties. A negative P balance was observed up to 10 kg P/ha. Key words: Response; Phosphorus fertilizer; Inbred; Hybrid rice DOI: http://dx.doi.org/10.3329/dujbs.v19i2.8962 DUJBS 2010; 19(2): 181-187

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Molecular Characterization and Genetic Diversity Study in F3 Population of Rice

Progressive Agriculture ◽

10.3329/pa.v20i1-2.16839 ◽

2013 ◽

Vol 20 (1-2) ◽

pp. 1-8

Author(s):

MM Rahman ◽

L Rahman ◽

SN Begum ◽

F Nur

Keyword(s):

Genetic Distance ◽

Gene Diversity ◽

Random Amplified Polymorphic Dna ◽

Molecular Genetic ◽

Molecular Genetic Analysis ◽

Polymorphic Loci ◽

Rice Genotypes ◽

High Level ◽

Genetic Diversity Study ◽

Diversity Study

Random Amplified Polymorphic DNA (RAPD) assay was initiated for molecular genetic analysis among 13 F3 rice lines and their parents. Four out of 15 decamer random primers were used to amplify genomic DNA and the primers yielded a total of 41 RAPD markers of which 37 were considered as polymorphic with a mean of 9.25 bands per primer. The percentage of polymorphic loci was 90.24. The highest percentage of polymorphic loci (14.63) and gene diversity (0.0714) was observed in 05-6 F3 line and the lowest polymorphic loci (0.00) and gene diversity (0.00) was found in 05-12 and 05-15 F3 lines. So, relatively high level of genetic variation was found in 05-6 F3 line and it was genetically more diverse compared to others. The average co-efficient of gene differentiation (GST) and gene flow (Nm) values across all the loci were 0.8689 and 0.0755, respectively. The UPGMA dendrogram based on the Neis genetic distance differentiated the rice genotypes into two main clusters: PNR-519, 05-19, 05-14, 05-12 and 05-17 grouped in cluster 1. On the other hand, Baradhan, 05-9, 05-13, 05-11, 05-5, 05-6, 05-1, 05-4, 05-15 and 05-25 were grouped in cluster 2. The highest genetic distance (0.586) was found between 05-4 and 05-17 F3 lines and they remain in different cluster.DOI: http://dx.doi.org/10.3329/pa.v20i1-2.16839 Progress. Agric. 20(1 & 2): 1 8, 2009

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MICROPROPAGATION OF CHICKPEA FROM SHOOT TIP AND NODE SEGMENT

FLORA AND FAUNA ◽

10.33451/florafauna.v24i2pp270-274 ◽

2018 ◽

Vol 24 (2) ◽

Author(s):

J. D. BARSHILE

Keyword(s):

Shoot Tip ◽

Root Induction ◽

Multiple Response ◽

Ms Medium ◽

Growth Responses ◽

Rapid Multiplication ◽

Micro Propagation ◽

G 12 ◽

Better Than

Present investigation was undertaken to standardize technique for in vitro micro-propagation of chickpea( Cicer arietinum ) cultivar Vishwas (Phule G 12). Micropropagation method for chickpea was established and this method enabled much more efficient propagation of plants. The present work was aimed at evolving a protocol for rapid multiplication of chickpea using micropropagation technique. Explants from shoot tip and node segment were cultured on MS medium supplemented with different concentrations of BAP and Kinetin (1.0 to 2.5 mg/l) and their growth responses like shooting were elucidated. The maximum multiple response was observed with 2 mg/l concentration of BAP from both types of explant. The highest number of shoots (12.5 ± 0.3) was achieved on MS medium with 2 mg/l BAP using node segments. The medium supplemented with 2 mg/l of BAP was found better than all other concentrations. Individual shoots were transferred to IBA and IAA (1.0-1.5 mg/l) for root induction. MS medium supplemented with 2 mg/l of IBA proved better for rooting. Rooted plantlets were successfully hardened in greenhouse and established in the pot.

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ALTERNATIVE P-FERTILISERS FOR NORTHLAND SOILS

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1986.47.1734 ◽

1986 ◽

pp. 229-232

Author(s):

P.W. Shannon

Keyword(s):

Phosphate Rock ◽

Growth Responses ◽

Triple Superphosphate ◽

Rock Phosphates ◽

Distribution Costs ◽

Phosphate Retention ◽

Sechura Phosphate Rock ◽

Local Product ◽

Application Frequency ◽

Chatham Rise Phosphorite

Increasing material, processing, and distribution costs have raised superphosphate prices to a point where many farms cannot support the costs of meeting maintenance phosphate requires men& Alternatives to superphosphate, particularly those that have lower processing costs and contain more P, may offer a solution to the problem provided they are agronomically as effective. Phosphate rock may indeed be such an alternative. Preliminary results from a series of five trials in Northland show that on soils of moderate P fertility, with low phosphate retention (PR) and high pH (5.9.6.0), initial pasture growth responses to rock phosphates are smaller than those from single or triple superphosphate. On one soil of higher PR and lower pH, the differences in yield between the rock-phosphates and the super. phosphates were smaller. Of the rock phosphates tested, Sechura and North Carolina (unground and ungranulated) tended to be more effective than ground and granulated Chatham Rise phosphorite. The effect on production of applying fertilisers once every three years, as opposed to annual applications is being investigated using triple superphosphate and Sechura phosphate rock. After two years, production levels appear largely unaffected by differences in application frequency. A comparison of locally-produced superphosphate with a reference standard showed that both performed similarly, indicating that the local product was of satisfactory quality.

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