PJB-2022-9
Phenological Changes in Sixteen Wheat Genotypes Planted In optimum and late sowing in agro-ecologically different environments
Md. Monwar Hossain
Abstract
There has been growing research interest in phenological events in the face of climate change. Published studies mostly concentrated on two cultivars of temperate crops with the responses on diverse cultivars still poorly understood. In this study, sixteen spring wheat genotypes were evaluated at the research farms located at Dinajpur and Jashore, Bangladesh Wheat and Maize Research Institute, Bangladesh. Seeds were sown in irrigated timely sowing conditions (ITS) (23 November 2014 and 20 November 2014 at the re-search farms of Dinajpur and Jashore, respectively) and irrigated late sowing conditions (ILS) (22 Decem-ber 2014 and 20 December 2014 at the research farms of Dinajpur and Jashore, respectively). Among all genotypes tested in this study, the spike m-2, spikelet spike-1, grains spike-1, thousand grain weight (TGW) and grain yield were higher in the lines E3, E4, E8, E11, E12, E16 in comparison to the rest and control under the ITS and in the lines E3, E4, E5, E8, E10, E7, E11, E12 sown under the ILS. Moreover, plant height (PH), days to heading (DH) and days to maturity (DM) showed contrasting responses during both sowing times at the different locations. Furthermore, in comparison to other lines, these genotypes had signifi-cantly lower Area Under Disease Progress Curve (AUDPC) and yield loss percent due to late sowing than other lines, regardless of the sowing time or location. Overall, the study revealed striking phenological changes in wheat genotypes planted in the field. Therefore, it is recommended that additional experiments be carried out with these candidate genotypes under similar conditions and at different locations in order to improve the development of early maturing, heat tolerant and high yielding field-grown wheat varieties, with the goal of reducing the impact of global warming on wheat crop production.
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