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The focus of wheat research in Indonesia is to obtained new potential wheat lines that are adapted to low-mid elevation and heat tolerant. This study was aimed to obtain information on the effect of interaction of season x line x location and genetic variability of wheat lines in tropical agroecosystem. This study was conducted at the Seameo- Biotrop ( 1,000 masl) experimental field for two seasons. The results showed that there was an effect of interaction of season x line x location on plant height, days to flowering, number of spikelet and floret, seed/head weight, rate of grain filling, yield, flag leaf width, stomata density, chlorophyll b, and leaf greenness. Meanwhile several characters were only influenced by the interaction of line x location, they were yield component characters, ie. empty floret percentage, number of seed/ head, 1,000 seed weight, number of head/m2 and seed/plant weight. Seven characters were not influenced by interaction of neither season x line x environment nor line x location, they were number of productive tillers, head length, number of seed/head, chlorophyll a, ratio of chlorophyll a/b, total chlorophyll, and leaf thickness. The characters that have high heritability and wide genetic variability for the two analysis models were the number of spikelet.

Interaksi Genetik x Lingkungan dan Variabilitas Genetik Galur Gandum Introduksi (Triticum aestivum L.) di Agroekosistem Tropika