Context: Water stress is fast becoming a major limiting factor for wheat production. Hence, identifying drought tolerant genotypes is critical for sustaining the food supply chain. However, there are no phenotypic markers or statistical models available that may be employed for the efficient selection of field grown drought tolerant wheat genotypes. Objectives: We evaluated wheat genotypes to (1) identify novel sources of drought tolerance (2) understand underlying adaptation mechanisms of drought tolerance (3) identify phenotypic markers and a stable model for the selection of drought tolerant genotypes. Methods: One hundred ninety-six diverse wheat genotypes were evaluated at three different locations in India: Banaras Hindu University (BHU), Varanasi (E1 and E3: control; E2 and E4: drought); Agharkar Research Institute (ARI), Pune (E5 and E7: control; E6 and E8: drought) and Borlaug Institute for South Asia (BISA), Jabalpur (E9 and E11: control; E10 and E12: drought) for various agronomic, physiological and yield traits for two consecutive years. Drought was imposed at the heading stage (Z59) by withholding irrigation for four weeks until the moisture reading reached <45% than the control (100%). Results: The performance of all genotypes significantly declined under drought at all the locations. Normalized difference vegetation index (NDVI) significantly correlated (r = 0.41** and 0.36**) with the grain yield under drought during maturity. At the same time, there was no association under control conditions (r = 0.07 and 0.10) at the BHU center during 2020-21 and 2021-22, respectively. Stress indices, such as geometric mean productivity (GMP) and stress tolerance index (STI), showed a high correlation (r= 0.89** and r = 0.88**, respectively) with the grain yield under drought and were effective in differentiating drought tolerant genotypes. GGE bi-plots discriminated the environments (observed obtuse angle between E3 with E6 and E9, E4 with E6 and E9) having negative relation and cross-over interaction for grain yield. Further, the multi-trait stability index (MTSI) identified 29 stable genotypes across all environments and was predicted as the most accurate model due to its fewer Root Mean Square Prediction Difference (RMSPD) values. Conclusion: NDVI is a useful high throughput screening tool under drought and MTSI is an effective method for selecting stable wheat genotypes across different water stressed locations. Implications: The identified tools (NDVI), method (MTSI), and tolerant genotypes appear to be valuable resources that together will be useful in the ongoing breeding programs to enhance the drought tolerance of wheat.
Fire ecology plays an important roles in germination and establishment of many plant taxa. Smoke inducedgermination and seedling vigor are well documented in many wild, crop, and weedy species. Karrikins(KAR) substances in smoke are reported to be responsible for these effects. However, only a few experimentshave been conducted on different plant-derived smoke effects on particular plant speciesâ seeds. This studywas conducted to investigate effects of self-derived and other plants biomass-derived smoke on germinationand post-germination processes in maize and its wild relative teosinte. Smoke derived from maize and alegume (Vigna unguiculata ssp. sesquipedalis) foliage burning was exposed to maize variety Guidan 162and teosinte (Zeamexicana (Schrad.) Kuntze). Germination percentage in both maize and teosinte exposedto maize smoke was found to be significantly higher than unexposed and legume smoke exposure, howevergermination in legume smoke exposure was found to slightly higher than control but not significantly so.Shoot length in maize seeds exposed to maize smoke was highest and differed significantly compared tocontrol and legume smoke exposure, while control and legume smoke exposure showed approximatelythe same shoot lengths. Coleoptile and primary root lengths showed nosignificant variation among alltreatments. Similarly, seminal root length didnât show much variation but legume smoke exposure seedsfound to have the lowest seminal root length. Hence direct exposure to smoke without rinsing in watermay not positively affect the shoot and root length in maize. Further studies should address morphologicaltraits, transcriptome expression, and enzyme activity to clarify effects of self-derived and other plant-derived smoke on different plant species.
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