Evaluation of Hybrid Maize Tolerance under Low Nitrogen Condition based on Stress Tolerant Index and Stress Susceptibility Index Slamet Bambang Priyanto, Karlina Syahruddin, Roy Efendi
Research Center for Food Crops, Research Organization for Agriculture and Food,
National Research and Innovation Agency (BRIN)
Cibinong Science Center, Jl. Raya Jakarta-Bogor, KM. 46, Cibinong, Bogor, West Java 16911 Indonesia
Abstract
Nitrogen (N) deficiency in maize could cause a yield decrease than normal conditions. Yield reduction is one of the main concerns of plant breeders in stress conditions selection. This study aimed to identify the low N tolerant hybrid maize. This research was conducted at the IP2TP field station of the Indonesian Cereal Research Institute in Maros, South Sulawesi from June to October 2021. The experiment was arranged in a nested design using 75 maize genotypes and two levels of N fertilizer (N1=100 kg N/ha and N2=200 kg N/ha) as treatments with two replications. Variable observed was maize yield. Two tolerance indexes, such as the Stress Tolerant Index (STI) and Stress Susceptibility Index (SSI) was used to determine the maize^s tolerance to low N conditions. The results showed that the test hybrids showed tolerance level variations according to the SSI and STI indices. Seven tolerant hybrids and ten susceptible hybrids based on both indices. Six hybrids were tolerant according to SSI but susceptible according to STI. Five hybrids were tolerant based on STI but susceptible based on SSI. Hybrid CML 465 x AVLN 109-3, AVLN 109-3 x VL1016518, CAL 1471 E x B 11, AVLN 86-4 X 1026-12, CML 465 x CAL 1473, VL1016518 x P7 and CML 161X CI 32 hybrids were tolerant maize based on SSI and STI indexes. These hybrids have the opportunity to be used as breeding materials for low N tolerant maize in the next breeding program
