Abstract

• Wheat is grown on more land area than any other commercial crop and continues to be the most important food grain source for human. Triticum aestivum L. cultivar Kyone Phyu have been cultivated in Myanmar as a source of bread wheat since 1890. Spike morphology, seed fertility of these varieties were also studied in an attempt to determine the relationship between external appearances. Cultivars Kyone Phyu from six different collection sites such as Sintkaing, Wundwin, Sagaing, Chaung Oo, Monywa and Pindaya Township were collected and studied their morphological and yield characters. However, environmental factors, the degree day temperature, rainfall and relative humidity were also strongly affected on the formation of branching spikelets. It was observed that the above mentioned characters were varied among the samples collected from six growing different places.