Vegetative growth and yield associated flowering time variation in Sri Lankan rice 'Hondarawala'

Ranathunga, E. U. U. and Senanayake, S. G. J. N. and Dissanayake, N. and Seneweera, S. and Geekiyanage, S. (2016) Vegetative growth and yield associated flowering time variation in Sri Lankan rice 'Hondarawala'. Journal of Agricultural Sciences, 11 (1). pp. 42-52. ISSN 1391-9318


Breeding new varieties adaptable for changing climate is an essential need in sustainable rice production. Around 2000 Sri Lankan rice accessions at Plant Genetic Resources Centre (PGRC), Sri Lanka have not been fully characterized for the yield potential and sensitivity to mild photoperiodic differences for days to flowering (DF). DF is a candidate key determinant in yield components in rice and understanding the physiological and molecular nature for DF is important to manipulate crop yield through breeding programmes. The objective of this study was to assess the genetic diversity of 15 Hondarawala accessions from PGRC using selected 37 morphological characters and DF. DF varied from 58-189 days while accession number 3988 did not flower until 200th day of seed germination. Principal Component Analysis (PCA) revealed that four principle components (PA) explained 86.5% of total observed variation. Variation of DF positively associated with most of morphological characters of vegetative growth while a few characters were negatively associated. In the dendogram, 10 clusters formed at rescale distance of 5. Widely variable DF accessions distributed among clusters.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health
Date Deposited: 01 Jul 2016 07:23
Last Modified: 20 Jul 2016 04:02
Uncontrolled Keywords: days to flowering; genetic diversity; morphological characters; Sri Lankan rice
Fields of Research : 05 Environmental Sciences > 0501 Ecological Applications > 050102 Ecosystem Function
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820599 Winter Grains and Oilseeds not elsewhere classified
Identification Number or DOI: 10.4038/jas.v11i1.8079

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