Fig. 10

Extent of cold tolerance of Rayada rice, a Bangladesh confined deepwater rice ecotype. a-b Minimum temperature days at the two weather stations, neighboring Rayada rice growing areas, a Khulna, b Faridpur, Bangladesh, c-e Comparative cold tolerance of different rice varieties conducted in growth chamber, c SES score, d Representative phenotypes after prolong cold exposure (continuous 21 days of 10 °C), e Representative phenotypes 7 days after recovery at 28 °C, f-h Comparative cold tolerance at field conditions, f Temperature profile at the experimental site during January 2016, collected from the nearest automated weather station. g Representative phenotypes of Rayada varieties 7 days after the cold-wave, h that of the Indica varieties. Ind 1, 2 and Jap 1, 2 represent BR 11, BRRI 36, Donjgin, Nipponbare, respectively where BRRI 36 is cold tolerant indica variety. Different rice varieties used in the extent cold stress tolerance were collected from International Rice Research Institute, Bangladesh Rice Research Institute, National Institute of Agrobiological Sciences, Japan and Pohang University of Science and Technology, Korea