Evaluation of purple rice advanced lines for photoperiod insensitivity during F7 and F8 generations between Kum Doi Saket and Pathum Thani 1

Abstract

Kum Doi Saket (KDK) is a glutinous purple rice variety, selected from local rice in northern of Thailand, contains high grain anthocyanin. However, KDK has low yield and photoperiod insensitivity thus can be grow only once per year. To resolve this limitation, plant breeding group at Division of Agronomy, Faculty of Agriculture, Chiang Mai University has developed progenies from the cross between Kam Doi Saket (KDK) and Pathum Thani 1 (PTT1). The present research is continuing to evaluate and select the lines with photoperiod insensitivity, black pericarp and high grain yield in F₇ to F₈ generations from a cross between KDK and PTT1. There were five non-glutinous lines (NGP 1-5) with green leaf blade, leaf sheath, stipule and internode similar to male parent (PTT1), but had black pericarp similar to their female parent (KDK). The F₇ and F₈ generations were evaluated in the field during wet season of 2016 and dry season of 2017, respectively. The result suggested that day of flowering among the lines varied between 114-120 days and 122-126 days, plant height between 54-801 cm and 76-122 cm. yield between 591-751 and 586-851 kg/rai and content of anthocyanin between 3.7-36.3 and 10.2-36.3 mg/100 g, respectively. Taken together, two advanced lines were selected, NGP3 and NGP1, with yield at 663 and 751 kg/rai in wet season of 2016 and 580 and 850 kg/rai in dry season of 2017 and grain anthocyanin was 35 and 36 mg/100 g in both seasons, respectively which is higher than the female parent (KDK) in the wet season with 31.1 mg/100 g. The amylose content of both advanced lines was similar as male parent (PTT1). Both advanced lines will be grown for seed multiplication and yield trial in farmers’ fields in the following generations.