Determination of yield and yield components of some varieties for early season potato (solanum tuberosum l.) growing

Bu çalışma, Adnan Menderes Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü deneme arazisinde, farklı olgunlaşma süresine sahip patates çeşitlerinin, Aydın koşullarında turfanda yetiştiricilik açısından, verim ve verim unsurlarını belirlemek amacıyla, 2009 yılında yürütülmüştür. Çalışmada, 11 adet patates çeşidi (Vangogh, Latona, Carmona, Marabel, Agata, Adora, Olympia, Fabula, Hermes, L.Cleary, Safrane) materyal olarak kullanılmıştır. Deneme, 3 tekkerrürlü olarak, tesadüf blokları deneme desenine göre kurulmuştur. Çalışmada bitkide sap sayısı (adet/bitki), bitki başına yumru sayısı (adet/bitki), bitki başına yumru verimi (g/bitki), tek yumru ağırlığı (g), büyük yumru oranı (%) (> 50 mm), orta yumru oranı (%) (> 30 mm, < 50 mm), küçük yumru oranı (%) (< 30 mm) ve dekara yumru verimi (kg/da) özellikleri incelenmiştir. ıncelenen özelliklerden bitki başına yumru sayısı, bitkide sap sayısı, bitki başına yumru verimi, orta yumru oranı ve dekara yumru verimi açısından en yüksek değerin Agata çeşidinde olmasından dolayı Aydın koşullarında turfanda patates yetiştiriciliğinde bu çeşidin en uygun olduğu saptanmıştır.This study was conduncted in the experiment fields at the Field Crops Department of Faculty of Agriculture at Adnan Menderes University in 2009 to determine yield and yield components of different maturity groups potatoes for early season growing in Aegean Region in Aydın conditions. The research was carried out in randomized blok design with 3 replications and 11 different potato varieties (Vangogh, Latona, Carmona, Marabel, Agata, Adora, Olympia, Fabula, Hermes, L.Cleary, Safrane) were used. In this study, tuber numbers per plant (number/plant), single tuber weight (g), tuber yield per plant (g/plant), plant stem numbers (number/plant), big tuber rate (%) (> 50 mm), medium tuber rate (%) (> 30 mm - < 50 mm), small tuber rate (%) (< 30 mm) and tuber yield (kg/da) features were observed. Among the observed characteristics, tuber number per plant, tuber yield per plant, plant stem number, medium tuber rate and tuber yield for Agata variety was higher than other varieties. It can be concluded that Agata was the most suitable variety for off - season growing in Aydın conditions

QTL mapping of yield components and kernel traits in wheat cultivars TAM 112 and Duster

In the Southern Great Plains, wheat cultivars have been selected for a combination of outstanding yield and drought tolerance as a long-term breeding goal. To understand the underlying genetic mechanisms, this study aimed to dissect the quantitative trait loci (QTL) associated with yield components and kernel traits in two wheat cultivars `TAM 112' and `Duster' under both irrigated and dryland environments. A set of 182 recombined inbred lines (RIL) derived from the cross of TAM 112/Duster were planted in 13 diverse environments for evaluation of 18 yield and kernel related traits. High-density genetic linkage map was constructed using 5,081 single nucleotide polymorphisms (SNPs) from genotyping-by-sequencing (GBS). QTL mapping analysis detected 134 QTL regions on all 21 wheat chromosomes, including 30 pleiotropic QTL regions and 21 consistent QTL regions, with 10 QTL regions in common. Three major pleiotropic QTL on the short arms of chromosomes 2B (57.5 - 61.6 Mbps), 2D (37.1 - 38.7 Mbps), and 7D (66.0 - 69.2 Mbps) colocalized with genes Ppd-B1, Ppd-D1, and FT-D1, respectively. And four consistent QTL associated with kernel length (KLEN), thousand kernel weight (TKW), plot grain yield (YLD), and kernel spike-1 (KPS) (Qklen.tamu.1A.325, Qtkw.tamu.2B.137, Qyld.tamu.2D.3, and Qkps.tamu.6A.113) explained more than 5% of the phenotypic variation. QTL Qklen.tamu.1A.325 is a novel QTL with consistent effects under all tested environments. Marker haplotype analysis indicated the QTL combinations significantly increased yield and kernel traits. QTL and the linked markers identified in this study will facilitate future marker-assisted selection (MAS) for pyramiding the favorable alleles and QTL map-based cloning.Horticulture and Landscape Architectur

QTL Analyses of Yield and Yield-related Traits in Wheat Using a Mapping Population From a TAM 113/Gallagher Cross

Understanding genetic architectures of yield and yield components of dryland and irrigated wheat (Triticum aestivum L.) is pivotal to developing modern high-yielding germplasm and cultivars, while maintaining end-use quality traits and tolerance to biotic and abiotic stresses. The aim of this study was to construct a genetic map and detect major quantitative trait loci (QTL) linked to yield and yield components using the biparental population developed from the cross ‘TAM 113’/’Gallagher’. Field studies including 191 recombinant inbred lines (RILs) were conducted at McGregor, College Station, and Bushland in Texas during the 2018-2019, 2019-2020, and 2020-2021 growing seasons. A set of 8,261 single nucleotide polymorphisms (SNPs) markers was used to construct a high-density genetic map for all 21 chromosomes using JoinMap 4.0. Genomic regions associated with yield and yield components were detected through linkage analysis and QTL identification using IciMapping. A total of 160 QTL were detected for all traits collected in the study. Among them, 10 QTL were detected at individual environments and 12 cluster QTL regions were identified. One major QTL was located at 34 Mb on chromosome 2D, affecting multiple traits including two consistent QTL for heading date (Qhd.tamu.2D.34) and plant height (Qph.tamu.2D.34), overlapping with the major photoperiod gene Ppd-1. Another cluster QTL, detected on 2 D at 37 Mb, was very close to a previously identified cluster controlling multiple traits, including yield and kernel area. Other important QTL clusters were located between 52 Mb and 66 Mb on 7D including one consistent QTL for grain yield at 52 Mbp that increased yield up to 24.16 g m-2, increased harvest index up to 1 % and increased kernel diameter by 0.03 mm. This study dissects genetic mechanisms associated with yield and its components, thus providing valuable information for wheat improvement

The Contribution of Self-Directed Strategies to the Development of Adult Metacognition at Higher Maritime Education and Training

ABSTRACT Self-directed learning, &quot;an approach enabling to engage learners in the learning process &quot;to acquire higher-order thinking outcomes&quot; (Borich , 2004 : 294), should be the primary focus at higher maritime education and training. This focus could be attributed to such peculiar characteristics of adult learning as the willingness to put the knowledge and skills gained immediately into practice, the high interests in learning the subject matters directly related to their profession, the wealth of experience already owned, and enthusiasm in conducting their own cognitive strategies up to metacognitive levels resulting in &quot;higher-order thinking&quot; and &quot;life long learning&quot;. This study aims to seek possible means of engaging adult learners at higher maritime education and training in the learning process through effective use of self-directed learning strategies so as to promote their metacognition. The problem based discussion sessions are thought to provide the promising environment for this purpose. Hence, the practices conducted at the higher maritime education and training institution, where the authors teach, are analyzed, which will include the learners&apos; perceptions. The study comprises four parts. The first part highlights the basic requirements in effective adult learning. The second part focuses on the importance of raising cognitive strategies up to metacognitive levels. The third part analyzes the practices experienced, which includes learners&apos; perceptions through &quot;Higher-order Thinking and Problem Solving Checklist.&quot; The fourth part highlights the results of accompanying discussions on the aspects that need to be improved

The Contribution of Self-Directed Strategies to the Development of Adult Metacognition at Higher Maritime Education and Training

March 29, 2007Self-directed learning, ???an approach enabling to engage learners in the learning process ???to acquire higher-order thinking outcomes??? (Borich , 2004 : 294), should be the primary focus at higher maritime education and training. This focus could be attributed to such peculiar characteristics of adult learning as the willingness to put the knowledge and skills gained immediately into practice, the high interests in learning the subject matters directly related to their profession, the wealth of experience already owned, and enthusiasm in conducting their own cognitive strategies up to metacognitive levels resulting in ???higher-order thinking??? and ???life long learning???. This study aims to seek possible means of engaging adult learners at higher maritime education and training in the learning process through effective use of self-directed learning strategies so as to promote their metacognition. The problem based discussion sessions are thought to provide the promising environment for this purpose. Hence, the practices conducted at the higher maritime education and training institution, where the authors teach, are analyzed, which will include the learners??? perceptions. The study comprises four parts. The first part highlights the basic requirements in effective adult learning. The second part focuses on the importance of raising cognitive strategies up to metacognitive levels. The third part analyzes the practices experienced, which includes learners??? perceptions through ???Higher-order Thinking and Problem Solving Checklist.??? The fourth part highlights the results of accompanying discussions on the aspects that need to be improved.Dokuz Eylul University School of Maritime Business and Managemen

Effect of sintering parameters on the microstructure and micromechanical properties of in-situ synthesized boride phases (Fe2B-FeB) in iron matrix composites reinforced with B4C particles

In this study, the influence of sintering parameters on the microstructure and micromechanical properties of ceramic reinforced iron&nbsp;matrix composites&nbsp;is investigated. Composites containing 5–10-20-30&nbsp;vol% B4C were fabricated by in-situ&nbsp;powder metallurgy&nbsp;(IPM) and sintered at various temperatures and durations. Hot pressed powder mixtures were sintered at constant duration (60&nbsp;min at 1000–1150-1300&nbsp;°C) and constant temperature (1150&nbsp;°C for 30–120&nbsp;min) in a protective environment. The influence of these parameters is evaluated by investigating microstructural changes using SEM, XRD, EDX, and optical microscopy, density and porosity by Archimedes method, and finally, micromechanical properties by hardness determination. Results showed that while increasing reinforcement ratios of B4C particles caused reduced density in the green compacts, B4C particles under a certain size (&lt;7&nbsp;μm) were randomly distributed in the mixture and lead to the formation of iron borides. Additionally, increased hardness was witnessed for all temperatures with increasing reinforcement ratios until 20&nbsp;vol% B4C, after which hardness was decreased. In fact, 20&nbsp;vol% B4C showed excellent properties and was comparatively much sensitive to both, increasing&nbsp;sintering temperatures&nbsp;and duration. In-situ synthesized iron borides became the decisive factor in the increased hardness of the composites.</p