Genetic Advancement of Newly Developed Wheat Populations Under Drought-Stressed and Non-Stressed Conditions
- PDF / 214,243 Bytes
- 8 Pages / 612 x 811 pts Page_size
- 76 Downloads / 225 Views
J. Crop Sci. Biotech. 2019 (June) 22 (2) : 169 ~ 176 DOI No. 10.1007/s12892-018-0262-0 RESEARCH ARTICLE
Genetic Advancement of Newly Developed Wheat Populations Under Drought-Stressed and Non-Stressed Conditions Kwame Wilson Shamuyarira1*, Hussein Shimelis1, Terence Tapera1, Toi John Tsilo2 1
University of KwaZulu-Natal, African Centre for Crop Improvement, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa 2 Agricultural Research Council-Small Grain Institute, Private Bag X29, Bethlehem 9700, South Africa Received: December 18, 2018 / Revised: January 08, 2019 / Accepted: March 13, 2019 Ⓒ Korean Society of Crop Science and Springer 2019
Abstract Genetic variation and heritability estimates in early generations are important in identifying superior families that can be targeted for genetic advancement. Early generation selection has been a successful tool to enhance selection efficiency in plant breeding programs. The aim of this study was to select and advance F3 families of wheat relative to their parents for drought tolerance using agronomic traits. Twelve parental lines and 66 newly-developed F3 families were evaluated using a 6 x 13 alpha-lattice design under drought-stressed and non-stressed conditions. Considerable genetic and phenotypic variation was observed for days to heading, plant height, spike length, kernels per spike, fresh biomass, and grain yield. Expected genetic gains were high for fresh biomass and grain yield. The families LM02 x LM05, LM02 x LM23, LM09 x LM45, and LM13 x LM45 were high yielding with high biomass values and are recommended for genetic advancement using single seed descent. Key words : Early generation selection, genotypic coefficient of variation, heritability, phenotypic coefficient of variation, wheat
Introduction Wheat (Triticum aestivum L.) is a major cereal crop which is the main source of carbohydrates and protein in different regions globally. In South Africa, wheat is the most important grain crop after maize (Nhemachena and Kirsten 2017). There has been a significant decline in wheat production in the country in the last 20 years (van der Merwe 2015). Further, the national mean productivity of wheat is low at 3.76 t ha-1 compared with the potential yield of the crop that can reach up to 10 t ha-1 (Grain SA 2018). This low productivity has been attributed to various production and economic constraints including drought, heat stress, biotic stresses, and reduced profitability. Drought stress is the greatest challenge limiting wheat productivity in the dryland production regions of South Africa. Wheat is sensitive to drought stress, and the increasing incidence of drought causes a significant reduction in both
grain yield and quality. Consequently, developing drought tolerant wheat cultivars is a major goal for the 1)Agricultural Research Council-Small Grain Institute (ARC-SGI) to improve wheat productivity in dryland growing areas of South Africa. To establish a well-characterized germplasm pool in its prebreeding program, the ARC-SGI imported drough
Data Loading...
