اعلانات هامة

Experiments were carried out at Raqqa Research Center (RRC) and Ali Baglih Research Station (ABRS), Raqqa governorate, Syria, in 2013 to study Phenotypic and Genotypic Variation, Heritability and Association between yield and its components in Some Maize (Zea mays L) Genotypes (15 crosses, 8 parents and check) in linextester analysis. The experiments were arranged in a randomized complete block design with three replications.

The presence of a wide range from significant genotypic and phenotypic variation showed by most of the studied traits. High broad sense heritability estimate was showed by ear height (0.94) and plant height (0.97), while High narrow sense heritability estimate was recorded by number of kernel/row (0.48) and ear diameter (0.50) at RRC. At ABRS, the number of kernels/row, ear diameter and 100 kernels weight exhibited high broad sense heritability estimates (0.83, 0.83 and 0.86), respectively. while high narrow sense heritability estimates showed by number of kernels/row and ear length (0.67 and 0.78), respectively.

The highest value of genetic advance as mean percent was obtained for grain yield (53.8%) followed by ear height (29.9%) at RRC. While at ABRS, the highest (32.6 and 31.9%) genetic advance was recorded by grain yield and number of kernel/row, respectively.

Grain yield was highly and positively (r>0.71**) correlated with the 100 kernel weight, ear diameter, ear length, plant height and ear height. Its genotypic correlation coefficients with days to tasseling and silking and number of kernel per row were positive and significant (r>0.45*). Grain yield was no significant positive correlated (r0.34) with number of rows per ear. The direct effect for path analysis showed high negative associated between grain yield with earliness traits, and low positive with plant height, ear height and ear diameter, and moderate positive with number of rows per ear and ear length, and high positive with number of kernel per row and 100 kernel weight.

Based on the genotypic correlation and path analysis the number of rows per ear, number of kernel per row, effective ear length and 100 kernel weight, were the most important traits that could be used as selection criteria to improve grain yield.

Key Words: Maize, Variation, Heritability, correlation, Path Analysis.

نفذت التجارب الحقلية في مركز البحوث العلمية الزراعية بالرقة ومحطة بحوث العلي باجلية التابعة له بمحافظة الرقة للموسم 2013 لدراسة التباين الوراثي والمظهري ,معامل التوريث  والتلازم ما بين الغلة الحبية ومكوناتها في بعض الطرز الوراثية للذرة الصفراء (15هجين فردي و 8ابلاء وشاهد ) والناتجة بطريقة سلالة ×مختبر والمزروعة وفق تصميم القطاعات العشوائية الكاملة مع ثلاث مكررات.