Selection of Suitable Potato Genotypes for Late-Sown Heat Stress Conditions Based on Field Performance and Stress Tolerance Indices

al Mahmud, A., Alam, M. J., Kundu, B. C., Skalicky, M., Rahman, M. M., Rahaman, E. H. M. S., Sultana, M., Molla, M. S. H., Hossain, A., El-Shehawi, A. M., Brestic, M., & Sabagh, A. E. (2021). Selection of Suitable Potato Genotypes for Late-Sown Heat Stress Conditions Based on Field Performance and Stress Tolerance Indices. Sustainability. ISSN 2071-1050. 13(5). 14 p.

International Potato Center (CIP), -bred potato genotypes produce various yields under heat stress conditions due to being sown late. To explore options for achieving this, a replicated experiment was conducted at the field of Tuber Crops Research Sub-Centre, Bangladesh Agricultural Research Institute, Bogura, Bangladesh to evaluate the performance of fourteen CIP-bred potato genotypes with two controls (Asterix and Granola). The experiment was laid out in a split-plot design with three replications. Several indices were applied to find out the suitable genotypes under heat stress. The plant height increased by 34.61% under heat stress, which was common in all the potato genotypes. Similarly, other yield-participating characters like stem per hill, canopy coverage (%), plant vigor, and tuber number per plant were also increased under heat stress conditions. However, the tuber yield was decreased by 6.30% and 11.41%, respectively when harvested at 70 and 90 days after plantation. Moreover, "CIP-203" yielded the highest (40.66 t ha(-1)) in non-stressed whereas, "CIP-118" yielded the highest (32.89 t/ha) in stressed conditions. Likewise, the bred "CIP-218" and "CIP-118" performed better under both growing conditions and yielded >35.00 t ha(-1). According to a rank-sum test, among the fourteen potato genotypes, "CIP-218", "LB-7", "CIP-118", "CIP-232", and "CIP-112" were selected as heat-tolerant potatoes and can grow in both growing conditions with higher yield potential.