Genotypic variation in seedling root development, plant growth, and dry matter partitioning in sesame (Sesamum indicum l.)

Abstract

Sesame production has not increased significantly in the past due to poor stand establishment, seed shattering and lack of high yielding varieties. Genotypes with faster and more vigorous seedling root development could help growers to attain proper stand establishment and increase seed yield. Significant increases in seed yield of several crop species have been achieved due to improvement in drymatter accumulation or increased harvest index. Little information is available about these'parameters for sesame lines adapted to the High Plains of West Texas.

The objectives of this research were to characterize genetic variability for seedling root characteristics, plant growth, and dry matter partitioning in seven sesame genotypes. These genotypes (UCR-3, Eva, Calinda, Imp. Baco, SB-S-9, SB-S-12, and dtAb) were selected from diverse genetic backgrounds for this study. In the first part of the investigation, seeds of seven genotypes were planted in clear polyethylene growth pouches and grown in dark germination chambers at constant temperatures of 20, 25, 30, 35, and 40*C. Measurements were recorded daily for ten days after planting on main axis root length, number of lateral roots and lateral root length.