Varietal diversity of Sri Lankan traditional rice based on sensitivity to temperature and photoperiod at vegetative stage

Rathnathunga, Elpitiya Udari Uvindhya and Senanayake, Gamini and Seneweera, Saman and Geekiyanage, Sudarshanee (2019) Varietal diversity of Sri Lankan traditional rice based on sensitivity to temperature and photoperiod at vegetative stage. Journal of the National Science Foundation of Sri Lanka, 47 (1). pp. 51-68. ISSN 1391-4588

Abstract

Photoperiod and temperature are two important environmental factors affecting vegetative growth and yield of rice. The varietal diversity based on the response to temperature and photoperiod during vegetative growth was determined in a core collection of 40 Sri Lankan traditional rice accessions (SLTRA) and 2 improved and 2 wild rice types in terms of days to fully expansion of fifth leaf (DFL) and plant height (PH). Short day (SD), day neutral (DN) and long day (LD) conditions were imposed during 2 trials of high temperature (HT) and low temperature (LT) at 36.9 ± 0.43 °C and 34.0 ± 0.98 °C under natural temperature fluctuation. Average DFL of the collection at HT was significantly lower than that of the LT irrespective of photoperiods. Temperature affected the DFL of 22 accessions, while photoperiod alone affected 1 accession. Average PHs under HT were similar irrespective of the photoperiod, which were lower than those of LT. PH of 15 accessions was not affected by photoperiod or temperature. Temperature alone affected 12 accessions and photoperiod alone affected 2 accessions. Both photoperiod and temperature affected 4 accessions. In the cluster analysis on response to photoperiod and temperature, SLTRA and improved rice were differentiated into 2 clusters at a rescaled distance of 25. Further, sub-clusters grouped several accessions of the same variety together. The differential varietal response to photoperiod and temperature in SLTRA would be useful in breeding for climate change adaptations after further experiments on flowering time and yield.


Statistics for USQ ePrint 36990
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright - Journal of the National Science Foundation of Sri Lanka.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 06 Sep 2019 01:05
Last Modified: 13 Sep 2019 05:12
Uncontrolled Keywords: fifth leaf stage, oryza sativa, photoperiod sensitivity, temperature, traditional rice
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050299 Environmental Science and Management not elsewhere classified
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070399 Crop and Pasture Production not elsewhere classified
Identification Number or DOI: 10.4038/jnsfsr.v47i1.8928
URI: http://eprints.usq.edu.au/id/eprint/36990

Actions (login required)

View Item Archive Repository Staff Only