Desain didaktis berbasis Permainan Tradisional Engklek di Sekolah Dasar

Abstract This research motivated by the findings of learning obstacles experienced students in material around square. This is known based on the results of  test questions conducted during preliminary study to fourth grade elementary school students. To overcome  learning obstacles experienced by students, researchers will design a didactic design. The purpose of this study is to describe the didactic design on the material around square and describe the students' responses the implementation of didactic design. The didactic design can be interpreted  learning design that emphasizes the didactic aspect, namely the teacher's teaching method. This study uses method with a Didactical Design Research (DDR) research design consisting of three research stages, namely a prospective analysis of the didactic situation before learning (prospective analysis) in the form of a Hypothetical Didactic Design including ADP (Pedagogical Didactic Analysis), metapedadidactive analysis, and retrospective analysis (retrospective analysis), with data collection techniques used in the form of interviews, observations, and attitude scales. The research subjects were 26 students in grades IV and VI and 1 teacher for grade IV at SDN 1 Sindangrasa. Based on results of study, through application of the didactic design carried out in stages I and II,   can help overcome learning obstacles experienced by students in the material around a square. This is shown from the students' responses on the attitude scale, results of the LAS (Student Activity Sheet) work and interviews with teachers. In addition,   didactic design is able to create a fun and meaningful learning atmosphere for students. Keywords: learning obstacle, didactical design research, square, meaningful learning, LAS Abstrak Penelitian ini dilatarbelakangi oleh adanya temuan learning obstacle  yang dialami siswa pada materi keliling persegi. Hal ini diketahui berdasarkan hasil soal tes yang dilakukan pada saat studi pendahuluan kepada siswa kelas IV Sekolah Dasar. Untuk mengatasi learning obstacle yang dialami siswa, peneliti akan merancang sebuah desain didaktis. Tujuan dari penelitian ini adalah untuk mendeskripsikan desain didaktis pada materi keliling persegi serta memaparkan respon siswa dan guru terhadap implementasi desain didaktis tersebut. Desain didaktis dapat diartikan sebagai desain pembelajaran yang lebih menekankan pada aspek didaktik yakni cara pengajaran guru. Penelitian ini menggunakan metode Didactical Design Research (DDR) yang terdiri dari tiga tahap penelitian, yakni analisis situasi didaktis sebelum pembelajaran (prospective analysis) berupa Desain Didaktis Hipotesis termasuk ADP (Analisis Didaktis Pedagogis), analisis metapedadidaktif, dan analisis retrospektif (retrospective analysis), dengan teknik pengumpulan data yang digunakan berupa wawancara, observasi, dan skala sikap. Subjek penelitian yaitu 26 siswa kelas IV dan VI serta 1 guru kelas IV SDN 1 Sindangrasa. Berdasarkan hasil penelitian, melalui penerapan desain didaktis yang dilakukan pada tahap I dan II dapat membantu mengatasi learning obstacle yang dialami siswa pada materi keliling persegi. Hal ini ditunjukkan dari respon siswa pada skala sikap, hasil pengerjaan LAS (Lembar Aktivitas Siswa) serta wawancara terhadap guru. Selain itu, desain didaktis mampu menciptakan suasana pembelajaran yang menyenangkan dan bermakna bagi siswa.  Kata kunci : hambatan belajar, desain didaktis, persegi, pembelajaran bermakna, LAS

Genetic Basis of Water Stress Tolerance in Triticum Aestivum L.

Water stress is a key constraint in grain production of bread wheat. Using genomic and advanced breeding tools, genetic improvement in wheat and other crops is possible under water stress conditions. Fifty wheat genotypes were screened against water stress using traits like relative water contents and excised leaf water loss. Two water stress tolerant (Chakawal-50 and mairaj-08) and two susceptible (9436 and Millat-11) genotypes were identified and crossed to develop F1, F2 and backcross generations. Genetic analysis was conducted for relative water contents, excised leaf water loss, cell membrane thermo-stability, photosynthetic rate, stomatal conductance, CO2 assimilation, chlorophyll contents, plant height, flag leaf area, specific flag leaf area, peduncle length, spike length, number of tillers per plant, grain weight per spike, number of grains per spikes, 1000-grain weight, grain yield per plant and harvest index. Presence of additive, dominance and epistatic components were identified. Gene action was found complex showed that selection should be done in later generations for improvement of traits. Medium to high broad sense heritability, low to medium narrow sense heritability and low to high genetic advance was observed. Analysis under normal and water stress conditions revealed heterosis for relative water contents, excised leaf water loss, chlorophyll contents and plant height. Correlation analysis showed that relative water contents, cell membrane thermo-stability, photosynthetic rate and grain yield per plant were positively correlated with each other. Excised leaf water loss was negatively correlated with cell membrane thermo-stability, photosynthetic rate, relative water contents and grain yield per plant. A total of 30 ISSR markers were used to survey F2 population developed by a cross of Chakawal-50 (tolerance) and 9436 (susceptible) revealing a lots of DNA polymorphism. DNA polymorphism was used to construct genetic linkage map. In linkage analysis 73 bands produced from 4 ISSR markers were mapped on chromosomes. One QTL for photosynthetic rate on chromosome 3A, one for cell membrane thermo-stability on chromosome 2B and one for relative water contents on chromosome 4D was identified. These QTLs could be used to mold wheat genome into water stress tolerant wheat genome.