Volume 26, Issue 1, August 2016, Pages 355–360
Jean Pierre KABONGO TSHIABUKOLE1, Amand MBUYA KANKOLONGO2, Gertrude PONGI KHONDE3, Antoine MUMBA DJAMBA4, Roger KIZUNGU VUMILIA5, and Constant Nkongolo Kabwe6
1 Programme National Maïs, INERA, RD Congo
2 Programme National Maïs, INERA, RD Congo
3 Programme National Maïs, INERA, RD Congo
4 Université Pédagogique Nationale, RD Congo
5 Direction Scientifique, biométrie et expérimentation, INERA DG &Université de Kinshasa, RD Congo
6 Département des Sciences Biologiques, Université Laurentienne, Sudbury, Ontario, Canada, P3E 2C6, Canada
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Twenty maize varieties were evaluated in southwestern savannah of DR. Congo during two years for their grain yield potential under optimum and water deficit conditions. A factorial experimental design with three replicates was adopted. Grain yield obtained under optimum was considered as yield potential (Ri) while the one in water deficit conditions was considered as yield performance under stress (Rs). Six stress tolerance indexes, including Stress Tolerance Index (STI), the Sensitivity to Stress Index (SSI), mean productivity (MP), geometric mean productivity (MGP), the stability index Performance (ISR) and stress tolerance (TOL) were used to identify genotypes tolerant to drought. Linear regressions were done between Ri and Rs yields and between six stress tolerance indexes. High positive correlations were revealed between Ri and Rs yields and indexes STI, MP and MGP. Furthermore SSI and TOL indexes were highly correlated positively and negatively to SRI at Rs. High significant correlations were observed between STI, MP and MGP while SRI, SSI and TOL are highly correlated, and are slightly or not correlated with STI MP and MGP. Varieties ranking based on STI, MP and MGP is similar to that based on the combination of the two rankings prepared on Ri and Rs. For maize, ranking varieties based on SSI and TOL is in the opposite direction of that obtained according to the Ri and Rs yields. The selection of lines based on the index can be more effective by combining high values of STI and MP at low to moderate values of SSI and TOL.
Author Keywords: Maize, INERA, DRC, stress index, SSI.
Jean Pierre KABONGO TSHIABUKOLE1, Amand MBUYA KANKOLONGO2, Gertrude PONGI KHONDE3, Antoine MUMBA DJAMBA4, Roger KIZUNGU VUMILIA5, and Constant Nkongolo Kabwe6
1 Programme National Maïs, INERA, RD Congo
2 Programme National Maïs, INERA, RD Congo
3 Programme National Maïs, INERA, RD Congo
4 Université Pédagogique Nationale, RD Congo
5 Direction Scientifique, biométrie et expérimentation, INERA DG &Université de Kinshasa, RD Congo
6 Département des Sciences Biologiques, Université Laurentienne, Sudbury, Ontario, Canada, P3E 2C6, Canada
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Twenty maize varieties were evaluated in southwestern savannah of DR. Congo during two years for their grain yield potential under optimum and water deficit conditions. A factorial experimental design with three replicates was adopted. Grain yield obtained under optimum was considered as yield potential (Ri) while the one in water deficit conditions was considered as yield performance under stress (Rs). Six stress tolerance indexes, including Stress Tolerance Index (STI), the Sensitivity to Stress Index (SSI), mean productivity (MP), geometric mean productivity (MGP), the stability index Performance (ISR) and stress tolerance (TOL) were used to identify genotypes tolerant to drought. Linear regressions were done between Ri and Rs yields and between six stress tolerance indexes. High positive correlations were revealed between Ri and Rs yields and indexes STI, MP and MGP. Furthermore SSI and TOL indexes were highly correlated positively and negatively to SRI at Rs. High significant correlations were observed between STI, MP and MGP while SRI, SSI and TOL are highly correlated, and are slightly or not correlated with STI MP and MGP. Varieties ranking based on STI, MP and MGP is similar to that based on the combination of the two rankings prepared on Ri and Rs. For maize, ranking varieties based on SSI and TOL is in the opposite direction of that obtained according to the Ri and Rs yields. The selection of lines based on the index can be more effective by combining high values of STI and MP at low to moderate values of SSI and TOL.
Author Keywords: Maize, INERA, DRC, stress index, SSI.
How to Cite this Article
Jean Pierre KABONGO TSHIABUKOLE, Amand MBUYA KANKOLONGO, Gertrude PONGI KHONDE, Antoine MUMBA DJAMBA, Roger KIZUNGU VUMILIA, and Constant Nkongolo Kabwe, “Stress tolerance indexes of Maize (Zea mays L.) grown in the southwestern savannah in the Democratic Republic of Congo,” International Journal of Innovation and Scientific Research, vol. 26, no. 1, pp. 355–360, August 2016.
