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with a long anthesis to silking interval (ASI…

Summary of the 68 meta QTL (mQTL) for grain yield and anthesis-silking interval detected across 18 maize populations

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Anthesis to silking interval (ASI) ..

The observed characters were plant height, number of leaves per plant, days to anthesis, days to silking, anthesis-silking interval (ASI), days to harvest, ear length, ear diameter, ear weight at harvest, and grain yield per plant.

Identification of Quantitative Trait Loci for Anthesis-Silking Interval ..

AB - Development of multiple insect resistance in tropical maize represents a major effort of the maize breeding programme at CIMMYT. Resistance to the southwestern corn borer (SWCB) is polygenically controlled with primarily additive gene action. Our main objective was to identify quantitative trait loci (QTL) involved in resistance to SWCB. Other objectives were to detect QTL in the same population for plant height, female flowering, and the anthesis-silking interval (ASI). A population of 472 F2 individuals derived from a cross between the susceptible line Ki3 and the resistant inbred CML139, was restriction fragment length polymorphism (RFLP) genotyped using 110 maize probes. F3 families were rated for leaf-feeding damage after artificial infestation at one location in three consecutive years. Height and flowering were measured in protected trials in two locations. QTL analyses were conducted using joint composite interval mapping. Seven QTL on chromosomes 3, 5, 6, 8, and 9 explained 30% of the phenotypic variance (σ2(p)) for SWCB damage. Most QTL alleles conferring resistance were contributed from CML139. QTL showed dominance, partial dominance and additive gene action. Eleven QTL dispersed across the genome were determined to affect plant height and explained 43% of σ2(p). Four of these were in close proximity to loci with qualitative effects on plant height. Thirteen QTL (50% of σ2(p)) were identified for days to female flowering and nine (30% of σ2(p)) for ASI. Our results, along with those from other mapping studies at CIMMYT, are allowing us to formulate marker-assisted selection schemes to complement the breeding efforts for such complex traits as borer resistance.

Anthesis-silking interval (ASI) ..

BREEDING FOR DROUGHT TOLERANT MAIZE IN KENYA: SELECTION FOR ANTHESIS-SILKING INTERVAL Share: ..

0.223, 0.386 and 0.336 respectively, while leaf number per plant, days to anthesis, days to silking, ASI and days to harvest showed non-significant genotypic correlation coefficients.

Development of multiple insect resistance in tropical maize represents a major effort of the maize breeding programme at CIMMYT. Resistance to the southwestern corn borer (SWCB) is polygenically controlled with primarily additive gene action. Our main objective was to identify quantitative trait loci (QTL) involved in resistance to SWCB. Other objectives were to detect QTL in the same population for plant height, female flowering, and the anthesis-silking interval (ASI). A population of 472 F2 individuals derived from a cross between the susceptible line Ki3 and the resistant inbred CML139, was restriction fragment length polymorphism (RFLP) genotyped using 110 maize probes. F3 families were rated for leaf-feeding damage after artificial infestation at one location in three consecutive years. Height and flowering were measured in protected trials in two locations. QTL analyses were conducted using joint composite interval mapping. Seven QTL on chromosomes 3, 5, 6, 8, and 9 explained 30% of the phenotypic variance (σ2(p)) for SWCB damage. Most QTL alleles conferring resistance were contributed from CML139. QTL showed dominance, partial dominance and additive gene action. Eleven QTL dispersed across the genome were determined to affect plant height and explained 43% of σ2(p). Four of these were in close proximity to loci with qualitative effects on plant height. Thirteen QTL (50% of σ2(p)) were identified for days to female flowering and nine (30% of σ2(p)) for ASI. Our results, along with those from other mapping studies at CIMMYT, are allowing us to formulate marker-assisted selection schemes to complement the breeding efforts for such complex traits as borer resistance.

performance and anthesis silk interval (ASI) ..

Anthesis silking interval (ASI) It is reported that low value of ASI is important because it

Each population was evaluated for 12-17 different traits, including grain yield, anthesis date, number of ears per plant, and leaf senescence, which are commonly associated with drought tolerance. Only grain yield and ASI were selected as the main target traits in the present study. ASI was computed as the difference between days to silking and anthesis. Each trial was harvested when all leaves had senesced. Ears were dried and shelled, grain was weighed, and grain moisture determined by a capacitance meter. SAS program v9.2 was used for phenotypic data analyses, including calculating Best Linear Unbiased Predictor (BLUP), variance components and heritability under stressed and optimum environments.

Chromosome 1 harbored another mQTL genomic region downstream to the one described earlier, at 275.98–285.27 Mb, which predominantly integrated QTL for GY under WS conditions and one for GY under WW environment. Using a F2:3 population of Qi319 × Huangzaosi and SSR markers, Peng et al. () identified a stable QTL in the interval between 258.88 and 292.98 Mb interval, based on across WW environments. Unlike mQTL_GY_1a, this region has not been reported by many earlier studies that used biparental populations. However, with an association mapping approach and a set of 1,229 SNPs in a panel of about 350 inbred lines from CIMMYT, which included 5 parental lines used in the current study, Setter et al. () detected a significant association between a SNP marker (PZB01403.4) at 285.27 Mb and to the abscisic acid (ABA) levels in silks 7 days after flowering under water stress condition across 2 years in Mexico. The SNP is located within a gene (GRMZM2G124260) with aldehyde oxidase activity that is known to catalyze a wide range of reactions, including ABA synthesis (Ibdah et al. ). Abscisic acid is a fundamental component of the complex mechanisms that allow the plant to match water supply with the water demand. This hormone has been shown to affect many traits influencing the water balance of the plant through mechanisms of dehydration avoidance and dehydration tolerance (Giuliani et al. ). Another genome-wide association study using a 1,536 SNP chip and set of 95 inbred lines that are parents of popular hybrids in China identified three SNPs on chromosome 10 (PZB02529.1 at 86.32 Mb, PZB0111.8 at134.03 Mb and PZA03607.2 at 141.82 Mb) as strongly associated with GY, ASI and drought tolerance index across different environments (Hao et al. (). Setter et al. (), using a panel of inbred lines mentioned above, identified a region associated with accumulation of phasic acid in maize ears on chromosome 10 at 138.76 Mb. The SNP in this region is located within an aquaporin gene (GRMZM2G125023) that is known to be essential for regulation of water movement in cells (Devis et al. ).

with a maintained anthesis-silking interval under water deficit also ..
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  • Anthesis silking interval corn - Essay photo time

    Breeding Maize for Early Maturity and Drought Tolerance in Kenya using Anthesis to Silking Interval.

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    BREEDING FOR DROUGHT TOLERANT MAIZE IN KENYA: …

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QTL mapping in three tropical maize populations reveals a set of ..

Edmeades GO, Bolanos J, Elings A, Ribaut JM, Banziger M, Westgate ME, 2000. The role and regulation of the anthesis silking interval in maize. In: Physiology and modeling kernel set in maize; Westgate ME, Boote K (eds). pp: 43-73. Crop Sci Soc Am, Madison, WI, USA.

Crop Science Abstract - Causes for Silk Delay in a …

Significant associations ( P −4 ) under water stress observed across agronomic traits and locations. All 64 strong associations for WS (P −4 as the cut-off) that were observed on 10 maize chromosomes were pooled over a heat map. The strongly associated SNPs are appended by their positions on the chromosomes. Based on the P values, a heat map was generated for seven agronomic traits – anthesis-to-silking interval (ASI), ear girth (EG), ear length (EL), grain yield (GY), 100-kernel weight (HKW), kernels per row (KR), and the number of kernel rows (KRN) – recorded at three locations and mean of phenotypic data at all locations, and four models (see Methods for details) under waters-stressed conditions. Out of these 64 SNP associations, 31 were close to the drought-tolerant genes that regulate some molecular and physiological functions leading to drought tolerance (refer Figure ).

Breeding Maize for Early Maturity and Drought Tolerance …

An association mapping panel of 240 subtropical maize lines was subjected to WS and the performance of the stressed maize lines was compared with that of the lines grown under a well-watered (WW) environment. The panel was phenotyped for anthesis-to-silking interval (ASI), ear length (EL), ear girth (EG), kernels per row (KR), the number of kernel rows (KRN), 100-kernel weight (HKW), and grain yield (GY) at three locations: Indian Agriculture Research Institute (IARI), New Delhi; Acharya N G Ranga Agricultural University (ANGRAU), Hyderabad; and Agricultural Research Station (ARS), Karimnagar for two years. The overall performance of the hybrids under WS was significantly impaired [Additional file : Table S1]. The phenotypic correlation coefficient showed that GY and the traits contributing to it were positively and significantly correlated with each other, and ASI was negatively but significantly correlated with other agronomic traits [Additional file : Table S2].

ICSC2004 ; Symposia ; 1 ; 3 ; 1470 ..

Bolanos J, Edmeades GO, 1996. The importance of the anthesis-silking interval in breeding for drought tolerance in tropical maize. Field Crop Res 48: 65-80.

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