Identification of potential morpho-biochemical determinants conferring salt tolerance in wheat (Triticum aestivum L.) through seedling- and -reproductive stage phenotyping
DOI:
https://doi.org/10.14719/pst.2988Keywords:
Salinity screening, phenotyping, leaf cutting, seedling stage salt tolerance, reproductive stage salt tolerance, oxidative stress, stress indicesAbstract
To optimize a reproductive-stage-specific phenotyping protocol and isolate potential determinants conferring salinity tolerance in wheat, two consecutive experiments were conducted using salt-tolerant varieties (Binagom-1 and BARI Gom 25) and a sensitive variety (BARI Gom 20). In the first experiment, seedlings were grown hydroponically, and 14-day-old seedlings were subjected to two different levels of salt stress (EC=12 dS/m and 16 dS/m) for 7 days. Based on the results of tolerant and susceptible varieties, parameters such as root and shoot weight, shoot Na+/K+ ratio, chlorophyll content, proline content, methylglyoxal content, H2O2 content and lipid peroxidation content and the activities of enzymes such as ascorbate peroxidase, peroxidase, and glyoxalase I were considered as potential determinants of salt tolerance. The second experiment employed four leaf cutting treatments under both control and salinity stress conditions. Seedlings were grown in perforated pots filled with field soil, and at the heading stage, plants were subjected to salt stress (12 dS/m) after trimming as indicated. The combined analysis of control and salt stress data obtained from setup B reflected a significant decrease in yield and yield-attributing traits; however, a lesser decrease was observed in tolerant varieties. Correlation studies revealed that grain yield per spike exhibited a significant positive correlation with the number of seeds per spike, spike weight, plant height, and days to first flowering under both stress and control conditions. Additionally, different stress tolerance indices also supported the results of reproductive stage phenotyping. However, further studies will be required to tag the genes/QTLs controlling salinity tolerance in wheat at various growth phases.
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