Search Result of "Abebe, T."

About 26 results
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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Analysis of the Phenotypic Diversity Within Cultivated Potato Varieties in Ethiopia at Three Locations)

ผู้เขียน:ImgTesfaye Abebe, Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์, Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

The phenotypic diversity of 25 potato varieties was analyzed at three distinct locations in the Amhara region of Ethiopia with the main objective of determining the diversity present among them based on 11 quantitative and 18 qualitative morphological characteristics. The fi eld experiment was laid out in a 5 ? 5 balanced lattice design with six replications. The results of analysis of variance indicated highly signifi cant (P < 0.01) differences among varieties for all 11 quantitative characteristics considered. Furthermore, analysis of the average taxonomic genetic distance based on 18 qualitative characteristics using the Euclidean distance function revealed considerable divergence among the studied varieties. Accordingly, the genetic distance value ranged from 0.24 between Tolcha and Wochecha, European commercial varieties, to 0.72 between the farmer’s variety Ater Abeba and the improved variety Zengena. The 25 varieties were grouped into three main clusters based on the distance matrix following the hierarchical agglomerative clustering method known as UPGMA (unweighted pair group method with arithmetic mean). Cluster I, which was the largest, contained 18 varieties followed by clusters II and III, with 3 and 4 varieties, respectively. Thus, this study revealed the presence of suffi cient phenotypic diversity among varieties in the country that can be exploited for germplasm enhancement.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 047, Issue 6, Nov 13 - Dec 13, Page 803 - 817 |  PDF |  Page 

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ที่มา:วิทยานิพนธ์ ปริญญาเอก (จาก: บัณฑิตวิทยาลัย มก. และสำนักหอสมุด มก.)

หัวเรื่อง:Evaluation of Diversity among Potato (Solanum tuberosum L.) Cultivars in Ethiopia based on Morphological Characteristics and SSR Markers

ผู้เขียน:ImgTesfaye Abebe DESTA

ประธานกรรมการ:Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์

กรรมการร่วม:Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์

สื่อสิ่งพิมพ์:Library Collection

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Morphological, Cultural and Pathogenicity Variation of Exserohilum turcicum (Pass) Leonard and Suggs Isolates in Maize (Zea Mays L.))

ผู้เขียน:ImgDaniel Abebe, Imgนายณรงค์ สิงห์บุระอุดม, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Surveying and collecting isolates of the fungus Exserhilum turcicum (Pass) Leonard and Suggs, the causal agent of Northern Corn Leaf Blight (NCLB), were conducted in two maize growing areas of Ethiopia in 2004 and used for studying cultural, morphological and pathogenicity varations. The results revealed that NCLB was widely distributed in almost all surveyed areas. Seventy isolates were studied for morphology and most of the conidia shapes were curved, spindle and elongated. The size of the conidia averaged 93.97 ?m in length and 13.11 ?m in width. The number of septa was found to range from 2 to 7. The study of cultural characteristics showed that variation existed among representatives of 28 isolates in colony growth, colony color and pigmentation. Conidial growth rate of 28 isolates was significantly different after growing the fungus on PDA. Twenty representative isolates were selected and evaluated for pathognicity on 11 seedlings maize varieties. A significant difference of disease reaction was found among tested isolates, varieties and isolates by varieties interaction. Lesion type varied in size from 0.69-2.91cm.The most virulent isolate, GOR, was found to cause disease on five varieties. Lesion size that was classified as resistance, was 0.69 to1.12cm2. Susceptible lesion size was between 1.17-2.91cm2. By applying the UPGMA in the SAHN program for cluster analysis, a pathogenicity dendogram of 20 isolates were grouped into five clusters of virulent patterns. The results of this study indicated wide variations existed among the fungi studied, therefore, the effective development of maize variety resistant to northern corn leaf blight should involve using virulent isolates, together with a mixed isolates, in order to test the disease interactions and select for resistant genotypes.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 040, Issue 2, Apr 06 - Jun 06, Page 341 - 352 |  PDF |  Page 

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ที่มา:วิทยานิพนธ์ ปริญญาเอก (จาก: บัณฑิตวิทยาลัย มก. และสำนักหอสมุด มก.)

หัวเรื่อง:Morphological Characteristics and Pathogenicity of Exserohilum turcicum (Pass) Leonard and Suggs isolates on maize genotypes in Ethiopia

ผู้เขียน:ImgDaniel ABEBE GELETU

ประธานกรรมการ:Imgนายณรงค์ สิงห์บุระอุดม, รองศาสตราจารย์

กรรมการวิชาเอก:Imgดร.เอ็จ สโรบล, รองศาสตราจารย์, Imgดร.สมศิริ แสงโชติ, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract


Dissertation/Thesis Info
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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Variation in Chemical Composition and Pasting Properties of Starches of Different Potato Varieties Grown at Different Locations in Amhara Region, Ethiopia)

ผู้เขียน:ImgTesfaye Abebe, Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์, Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Potato starches isolated from 25 different varieties grown at three different locations in the Amhara region of Ethiopia in 2011 were studied to determine their variation based on amylose content (AMC) and amylopectin content (APC), and pasting properties by iodine colorimetry and Rapid Visco Analyzer procedures, respectively. The results revealed highly significant (P < 0.01) differences between cultivar and location. The mean values for the AMC and APC ranged from 20.86% (Jalene) to 30.58% (Ater Abeba), and 69.42% (Ater Abeba) to 79.14% (Jalene), respectively. The mean AMC index of locations ranged from 24.50% to 26.24% for the Adet and Debretabor sites. The peak viscosity (PV), hot paste viscosity (HPV), breakdown viscosity (BDV), cool paste viscosity (CV) and setback viscosity (SBV) ranged from 225.10 to 426.72, 135.01 to 191.83, 56.47 to 259.32, 173.68 to 247.51 and 27.17 to 68.15 Rapid Visco units (RVU), respectively, while the pasting time (PT) and pasting temperature (Ptemp) ranged between 3.35 to 4.91 minutes and 68.16 to 70.89 ?C, respectively. Correlation among starch properties showed significant (P < 0.01 and P < 0.05) associations except for PV with CPV and HPV with BDV and SBV. The highest PV (538 RVU), HPV (207 RVU), BDV (363 RVU), and CV (265 RVU) values were recorded at the cool Debretabor site. Thus, the study revealed the significant genetic variation present among varieties with regard to the starch chemical composition and pasting properties and the effects of growing location on these properties.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 047, Issue 2, Mar 13 - Apr 13, Page 166 - 181 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluation of Maize Varieties for Resistance to Northern Leaf Blight under Field Conditions in Ethiopia)

ผู้เขียน:ImgDaniel Abebe, Imgนายณรงค์ สิงห์บุระอุดม, รองศาสตราจารย์, Imgดร.สมศิริ แสงโชติ, รองศาสตราจารย์, Imgดร.เอ็จ สโรบล, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

A study of reaction of thirteen maize varieties to northern leaf blight mainly caused by Exserhilum turcicum (Pass) Leonard and Suggs, were conducted at three locations Gambella, Abobo and Bako during 2003 and 2004 crop seasons. Variation among maize varieties was observed for several disease variables; the number of lesion, size, incidence, area under disease progress curve (AUDPC) and severity rating scale. In general, significant differences among genotypes were observed for data based on lesion number, size, AUDPC and severity rating scale at all locations. Susceptible varieties Gussau, Aboboko and Local- M had high AUDPC, large lesion size, fast onset of disease and many lesions in numbers. The host entries used in this study indicated that Kuleni was the most resistant to northern leaf blight across three locations, with low rating score. There was different response among varieties depending on disease intensity at each location. At Abobo, the final severity increased from 0.00 to 96.66% in 2003 and the results observed from 10.00 to 96.66% at Bako. However, at Gambella the incidence was as low as from 0.00 to 83.33%. Disease assessment methods were generally correlated with one another. Several varieties showed similaly significant reaction to disease in all locations. This meant that there was no virulent difference existing in the pathogen populations from location to location.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 042, Issue 1, Jan 08 - Mar 08, Page 1 - 10 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Dry Matter Content, Starch Content and Starch Yield Variability and Stability of Potato Varieties in Amhara Region of Ethiopia)

ผู้เขียน:ImgTesfaye Abebe, Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์, Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์, Imgอรนุช ลีลาพร

สื่อสิ่งพิมพ์:pdf

Abstract

Evaluation of dry matter content (DMC), starch content (SC) and starch yield (SY) of 25 potato varieties was carried out at three distinct locations in the Amhara region of Ethiopia during the 2011 cropping season. The main objectives were to examine the variability and stability of these traits and determine the proper production environments. The 25 varieties were examined in a complete 5 ? 5 lattice design with six replications. Statistical analyses of the DMC, SC and SY of these varieties revealed signifi cant (P < 0.01) genotypic and location variation and genotype ? environment interactions. Consequently, their DMC and SC ranged from 17.82 to 26.70 and 9.75 to 17.85%, respectively, while SY ranged from 2.21 to 6.91 t.ha-1. Correlation analysis revealed a strong linkage (P < 0.01) among these characters. Additive main effects and multiplicative interactions analysis for DMC and SC stability identifi ed Gorebella, Ater Abeba, Challa, Belete and CIP-396004.337 as relatively stable for processing while Menagesha, Bulle, Ararsa were suitable for table purposes. Furthermore, Debretabor followed by Adet were found suitable for producing processing types while Merawi was suitable for table types. Thus, this study distinctly separated varieties and environments on the one hand and the available genetic resources for a breeding program aimed at improving DMC and SY of potato in Ethiopia on the other.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 046, Issue 5, Sep 12 - Oct 12, Page 671 - 683 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluation of Specifi c Gravity of Potato Varieties in Ethiopia as a Criterion for Determining Processing Quality)

ผู้เขียน:ImgTesfaye Abebe, Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์, Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Specifi c gravity (SG) is the measure of choice for estimating dry matter (DMC) and starch content (SC) and ultimately for determining the processing quality of potato varieties. Evaluation of the SG of 25 potato varieties was carried out at three distinct locations in the Amhara region of Ethiopia with the main objectives of determining their culinary quality and most suitable areas of production. The varieties were planted in a 5 ? 5 balanced lattice design of six replications during the 2011 rainy season. The results of the data analysis showed highly signifi cant (P < 0.01) genotypic and location differences and signifi cant (P < 0.05) genotype ? environment interactions. The pooled SG values ranged from 1.058 to 1.102. The SG of tubers of the improved variety Belete was the highest while that of Menagesha was the lowest. Furthermore, the SG values for varieties grown at Debretabor were higher than those for the corresponding varieties grown at Adet and Merawi. The DMC and SC were computed based on the SG and showed signifi cant (P < 0.01) genotypic variability. The highest DMC and SC were also obtained at Debretabor; thus, it is an ideal location to grow potatoes for high DMC and starch accumulation. Additive main effects and multiplicative interaction analysis identifi ed CIP- 392640.524, Zengena, Jalenie and Belete as stable genotypes with SG values above average.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 047, Issue 1, Jan 13 - Feb 13, Page 30 - 41 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Supplementation of Meal Concentrate on Growth and Subsequent Reproductive Performances of Woyto-Guji Goats)

ผู้เขียน:ImgTekleyohannes Berhanu, Imgดร.จำเริญ เที่ยงธรรม, รองศาสตราจารย์, Imgดร.สายัณห์ ทัดศรี, ศาสตราจารย์, ImgGirma Abebe, Imgดร.สมเกียรติ ประสานพานิช, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

The growth and subsequent reproductive performance of Woyto-Guji goats was evaluated under varying levels of meal concentrate supplementation in the hot to warm semiarid environments of southwestern Ethiopia. Forty fi ve primiparous Woyto-Guji goats aged 14.3 ? 0.49 mth, with 15.0 ? 2.9 kg mean bodyweight (BW) and mean body condition score (BCS) of 2.9 ? 0.05 were allotted in a completely randomized design to three treatment groups—no concentrate (T0, control), 200 g per goat daily (T1) and 400 g per goat daily (T2). Concentrate was fed for 90 d before mating and during the last 2 mth of pregnancy. Rhodes grass hay (Chloris gayana) was fed ad libitum to all goats. Supplementation signifi cantly increased the feed intake, BW and BCS of the goats. The fi nal average BW observed was 15.0, 18.1 and 20.2 kg and average daily gain (ADG) values were 2.7, 33.5 and 54.7 g.d-1 for the T0, T1 and T2 treatment groups, respectively. The supplemented groups mated and kidded earlier (within 4 and 3 d, respectively, from the fi rst mating and kidding of goats) compared to the control (mated and kidded within 12 and 10 d, respectively, from the fi rst mating and kidding of goats). Compared to the control, the pregnancy rate and kidding rate of goats were improved by 17% (T1) and 29% (T2) and by 71% (T1) and 83% (T2), respectively. The concentrate supplement may offer benefi ts in promoting growth, pregnancy, kidding rates and early mating and kidding of Woyto-Guji goats before the subsequent hot dry season of southwestern Ethiopia.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 047, Issue 1, Jan 13 - Feb 13, Page 74 - 84 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Variation of Mineral Concentrations Among Different Potato Varieties Grown at Two Distinct Locations in Ethiopia)

ผู้เขียน:ImgTesfaye Abebe, Imgดร.เฌอมาลย์ วงศ์ชาวจันท์, ผู้ช่วยศาสตราจารย์, Imgนายธัญญะ เตชะศีลพิทักษ์, รองศาสตราจารย์, Imgอรนุช ลีลาพร

สื่อสิ่งพิมพ์:pdf

Abstract

The extent of genetic variation in the protein and fi ber contents and the iron (Fe), zinc (Zn) and phosphorus (P) concentrations of 21 different potato varieties was studied at two distinct locations in Ethiopia. The experiments were conducted in a randomized complete block design in triplicate. Analysis of variance (ANOVA) of each set of experimental data revealed signifi cant (P < 0.01) genetic variation among varieties. The combined ANOVA also showed signifi cant (P < 0.01) variation due to location and genotype ? location interactions. Accordingly, the tuber protein and fi ber contents ranged from 3.77 to 7.36% and 1.18 to 2.07%, respectively. Likewise, the Fe, Zn and P concentrations ranged from 17.13 to 164.83, 7.07 to 20.21 and 143.68 to 357.76 mg.kg-1 dry weight, respectively. Consequently, men, women, and children can get 29, 13.3 and 65%, respectively, of their daily recommended nutrient intake (RNI) of Fe from eating 200 g fresh weight of tubers of the high Fe concentration variety Sisay and 12, 14.3 and 17%, respectively, of their daily RNI of Zn from 200 g of tuber of the high Zn variety Menagesha. Correlation analysis indicated a signifi cant (P < 0.01) association among these characters but not with protein and fi ber with Fe. Thus, this study found considerable variation in the mineral concentrations among potato varieties in Ethiopia which can be useful information to help curb mineral malnutrition.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 046, Issue 6, Nov 12 - Dec 12, Page 837 - 850 |  PDF |  Page 

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Researcher

ดร. จำเริญ เที่ยงธรรม, รองศาสตราจารย์

ที่ทำงาน:ภาควิชาสัตวบาล คณะเกษตร บางเขน

สาขาที่สนใจ:สรีรวิทยาและระบบฮอร์โมนการสืบพันธุ์ของสัตว์, สรีรวิทยาสิ่งแวดล้อม, การจัดการผสมพันธุ์โค-สุกรคุณภาพน้ำเชื้อและการผสมเทียมโค-สุกร, สรีรวิทยาการผลิตสัตว์

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