SCREENING OF RICE VARIETIES FOR HEAT TOLERANCE BASED ON THEIR AGRONOMIC AND PHYSIOLOGICAL TRAITS

Simple item page
dc.contributor.authorPATHIRANA, K.P.A.K.
dc.date.accessioned2021-04-27T06:09:30Z
dc.date.available2021-04-27T06:09:30Z
dc.date.issued2016
dc.description.abstractRice is the staple food of Sri Lankans. However, the rice production in Sri Lanka is threatened by the increasing air temperature. A continuous warming has occurred since 1930s in major agro ecological zones in Sri Lanka. Use of heat-tolerant rice varieties is an effective way to sustain the rice production in the future. Nineteen rice varieties including both newly improved and traditional varieties were screened inside a thermo-gradient chamber to identify rice varieties with high temperature tolerance based on their agronomic and physiological traits. Three temperature treatments (30 — 34 °C, 35 —37 °C and 38 — 42 °C, mean temperatures from 10:00 am to 1:00 pm) were given during the flowering period using the naturally fluctuating thermo gradient inside the chamber. The yield per hill, filled grain percentage, average thermal stability and the chlorophyll content of the rice varieties were recorded. Bg 304 had high filled grain percentage (80.2% — 95.4%) and yield per hill (7.0 g — 9.7 g) in all treatments and selected as the best performed variety. Bg 305 also had higher filled grain percentage (76.4%) and yield per hill (11.4 g) at temperatures of 35 — 37 °C. Bg 94-1, Bg 352 and Bg 370 recorded poor performances for all traits evaluated and found to be very susceptible to high temperature. Bg 359, Suwadal, Pachchaperumal and Pokkali started flowering before 7:30 am while Bg 357, Bg 358, Bg 360, Bg 369 and Kalu heenati flowered during 7:30 — 10:30 am. These varieties should be further screened in target environments before used. Selected varieties can also be used in developing heat-tolerant rice varieties for future cultivation. Keywords: Filled grain percentage, Flowering period, Heat stress, Yielden_US
dc.identifier.otherUWU/EAG/12/0026
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/6591/UWULD%20EAG%2012%200026-14052019112954.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;UWU/EAG/12/0026
dc.subjectExport Agriculture Degree Programme (EAG)en_US
dc.titleSCREENING OF RICE VARIETIES FOR HEAT TOLERANCE BASED ON THEIR AGRONOMIC AND PHYSIOLOGICAL TRAITSen_US
dc.title.alternativeResearch Article – EAG 2016en_US
dc.typeThesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
UWULD EAG 12 0026-14052019112954.pdf
Size:
2.96 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Export Agriculture Degree Programme (EAG)