天美传媒

Abstract

Sesame (Sesamum indicum L.) is an important edible oil crop. Meteorological factors such as temperature, rainfall and the amount of solar radiation determine the yield potential of sesame. To identify phenotypic diversity and to infer genotypic backgrounds in a collection of 250 sesame germplasm, we classified the germplasm based on variation in morphological traits using principal component (PC) and cluster analysis. The sesame germplasm were grouped based on five PCs, which accounted for 82.3% of total variation. The first PC (PC1) was positively correlated with days to flowering, days to maturity and number of capsules per plant whereas the second PC (PC2) was negatively correlated with all characteristics except capsule-bearing stem length. The third component (PC3) was highly positively correlated with capsule length and plant height. We constructed a scatter diagram of the first two PCs (PC1 vs. PC2), revealing four distinct groups of eigenvectors. Most sesame germplasm were widely distributed among Groups I, II, III and IV. Group III showed a wide range of distribution in the diagram. Otherwise, the distribution of the 250 germplasm was more compact in a scatter diagram of PC1 vs. PC3 compared with PC1 vs. PC2. Groups I, II, III and IV contained 142, 102, 2 and 3 sesame germplasm, respectively. The two germplasm in Group III were collected from different regions, as were the three germplasm in Group IV. The results show that the distribution of sesame origin is wider than the regions examined in view of phenotypic diversity.

Biography

Kang Bo Shim has completed his PhD from Seoul National University. He is a Senior Researcher of Crop Cultivation & Environment Research Division, National Institute of Crop Science, Rural Development Administration of South Korea. He has published more than 20 papers.

Email: shimkb@korea.kr