Vegetative Growth and Yield Associated Flowering Time Variation in Sri Lankan Rice “Hondarawala”

Rathnathunga, E. U. U.; Senanayake, S. G. J. N.; Dissanayake, N.; Seneweera, Saman; Geekiyanage, Sudarshanee

doi:10.4038/jas.v11i1.8079

Cited by 3 publications

(5 citation statements)

References 18 publications

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“…There were positive correlations between DF and quantitative morphological characters of PH, LL and CD and a negative correlation between PW (Table 3). Similar observations were reported for Sulai variety where positive correlations were present between DF and vegetative growth characteristics (PH, CN, LN, LL and LW) (Rathnathunga and Geekiyanage, 2015). In a photoperiod experiment with Sulai, Kohu mawee and Deveraddili, the yield was reduced under LD conditions where flowering was delayed in contrast to SD conditions (Geekiyanage et al, 2012).…”

Section: Relationship Between Days To Flowering On Vegetative Growth supporting

confidence: 73%

“…Days to flowering (DF) among 29 Sudu wee accessions varied from 62 -106 days except for accession 4193 which did not flower during the experimental period (Table 1). Flowering time range in Sudu wee was comparatively narrow in contrast to 56 to 200+ days among 16 accessions of Hondarawala variety and 57 -179 days among 12 accessions of Sulai variety Geekiyanage, 2015 andRathnathunga et al, 2016a). Flowering time variations during late short day season towards day neutral to long day season could be due to the presence of date fixed forms explained by Chandrarathna (1964).…”

Section: Flowering Time and Morphological Variation Among Accessions mentioning

confidence: 92%

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Within variety flowering time variation leads to yield variation in Sri Lankan traditional rice “Sudu wee”

Rathnathunga

Geekiyanage

2016

Ceylon J. Sci.

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Sri Lankan traditional rice is an important breeding resource for development of rice for ecological adaptation during the era of climate change. There are around 2000 accessions belonging to more than 500 varieties comprised of one to several accessions in each with wider morphological differences, flowering times and yield variations. Genetic identity of Sri Lankan traditional rice accessions belonging to each rice variety is not established at molecular level. Variety Sudu wee comprises of around 30 accessions at PGRC. Sudu wee could be useful in re-introduction programmes of traditional rice due to relatively shorter crop duration. The objective of the present study was to evaluate the diversity of 29 Sudu wee accessions from PGRC, based on days to flowering, (DF), 12 morphological and 2 physiological characters during non-inductive photoperiod season. DF varied from 62 to 106 days while accession 4193 did not flower during the experimental period of nearly 7 months. Leaf temperature at heading (LeT) and Leaf temperature difference at heading (LeTD), vegetative morphological characters and yield components varied among Sudu wee accessions. Seventy nine percent of total observed variation among accessions was explained through Principal Component Analysis. In the dendogram of accessions, 10 clusters were formed at the rescale distance of 5. Seed morphology indicated the genetic similarity among accessions while significantly different DF could be an indication of flowering time gene variation among similar genotypes. Increased DF reduced the grain yield increasing the vegetative growth among accessions of Sudu wee. Our results would be useful in future breeding for manipulating flowering time and yield within similar genetic backgrounds.

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Section: Relationship Between Days To Flowering On Vegetative Growth supporting

confidence: 73%

Section: Flowering Time and Morphological Variation Among Accessions mentioning

confidence: 92%

Within variety flowering time variation leads to yield variation in Sri Lankan traditional rice “Sudu wee”

Rathnathunga

Geekiyanage

2016

Ceylon J. Sci.

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“…Delayed flowering time increased the vegetative growth and reduced the grain size (Table 5). Similar observations were reported for Sulai, Sudu wee and Hondarawala varieties, where there were positive relationships between DF and vegetative growth characteristics, while negative relationships existed between DF and yield components (Rathnathunga et al 2013;Rathnathunga et al 2015;Rathnathunga et al 2016b;Rathnathunga et al 2016c). In contrast, relationship between DF and yield components of photoperiod responsive 43 Ma wee accessions of Sri Lankan traditional rice was positive under inductive short day season (Pushpakumari et al 2017).…”

Section: Variation Among Accessions Of Sri Lankan Traditional Rice Vasupporting

confidence: 59%

“…Comparatively similar PCs were identified in studies of Sulai, Sudu wee and Hondarawala varieties, which suggested the fact that same character standards applied in all genetic diversity studies of Sir Lankan rice (Rathnathunga et al 2015;Rathnathunga et al 2016b;Rathnathunga et al 2016c) (Table 2). Pachchaperumal accessions of 8827, 3408, 3752, 5548, 5550, 5547 and 9047 of cluster one, 5546, 3946, 6834 and 5549 of cluster two, accession of 5383 of cluster three were grouped into…”

Section: Genetic Diversity Of Pachchaperumal and Suduru Samba Accessimentioning

confidence: 60%

“…We have observed a wide flowering time variation among traditional rice Sulai (57-179 days), Sudu wee (62 to 200 days+) and Hondarawala (57 to 200 days+) accessions during late short day season in Sri Lanka in contrast to Pachchaperumal (60 -72 days) and Suduru samba (79 -99 days) (Rathnathunga et al 2015;Rathnathunga et al 2016b;Rathnathunga et al 2016c). The two varieties could be distinguishable due to variation in quantitative characters of DF, vegetative growth parameters and grain size, and qualitative character of pericarp colour.…”

Section: Variation Among Accessions Of Sri Lankan Traditional Rice Vamentioning

confidence: 99%

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Morphological diversity of Sri Lankan traditional rice varieties “Pachchaperumal” and “Suduru samba”

Rathnathunga¹,

Geekiyanage²

2017

Open Agriculture

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Sri Lankan traditional rice varieties consist of more than one accession mostly which, exhibit a wide variation in morphological characters, flowering time and yield. The objective of this study was to evaluate the diversity based on days to flowering (DF) and 12 morphological characters of two Sri Lankan traditional rice varieties Pachchaperumal and Suduru samba comprising of 13 and 7 accessions respectively. DF of Pachchaperumal and Suduru samba varied from 60 - 72 and 79 - 99 days respectively. Vegetative morphological characters and yield components also varied among Pachchaperumal and Suduru samba accessions while pericarp colour, grain width, and length were distinct characters between the two varieties. According to the hierarchical cluster analysis, 2 major clusters were identified at the rescale distance of 25 separating accessions of Pachchaperumal and Suduru samba except for accession 3136 of Pachchaperumal, which was located in Sudura samba cluster. Seven clusters were derived at rescaled distance of 5 where accessions of similar quantitative and qualitative morphological characters were clustered together. There were negative correlations between DF and selected yield components in contrast to positive correlations between DF and selected vegetative growth parameters. Our results may be useful in the determination of identity of accessions belonging to the same variety, which could be further supported by molecular analysis.

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Identification of Heterotic Groups and Patterns Based on Genotypic and Phenotypic Characteristics Among Rice Accessions of Diverse Origins

et al. 2022

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Identification of the right parental combinations to maximize heterosis is the major goal of hybrid breeding, which could be achieved through identification of heterotic groups. The main objective of this study was to identify promising heterotic groups for future rice breeding programs. A collection of 359 rice genotypes of diverse origins of China and abroad, composed of inbreds, maintainers, restorers, and temperature-sensitive genic male sterile (TGMS) lines were genotyped using 10K SNP chips. The SNP data set was subjected to genomic analyses for estimation of genetic divergence and diversity. Significant variations were observed in the germplasm with the identification of six different genetic groups. These lines were assigned to the genetic groups independent of their origin. Taking an account of commercially used heterotic groups present in each cluster, three cytoplasmic male sterile (CMS) lines and 14 inbred and restorer lines with moderate to high genetic distances selected from five heterotic patterns were crossed and obtained 42 F1 hybrids. A total of 14 hybrids were found with significant maximum mid- and better-parent heterosis, namely, TaifengA × Guang122, TaifengA × Wushansimiao, and TaifengA × Minghui63 for earliness; Guang8A × Huazhan for dwarf stature; and Guang8A × Huanghuzhan-1, TaifengA × Yuexiangzhan, Guang8A × Minhui3301, TianfengA × Guang122, Guang8A × Yahui2115, TianfengA × Huanghuazhan, TianfengA × Minghui63, TianfengA × Minhui3301, TaifengA × Gui99, and Guang8A × Yuenongsimiao for yield and yield-related traits. Mid-parent and better-parent heterotic F1 hybrids were in positive correlation with the genetic distances as that manifested by commercially used heterotic groups, encouraging the use of genotypic data for identification of heterotic groups. Our study provides an informative strategy for the development of early maturing, lodging resistant and high-yielding commercial hybrids and cultivars in future heterosis breeding programs.

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Vegetative Growth and Yield Associated Flowering Time Variation in Sri Lankan Rice “Hondarawala”

Cited by 3 publications

References 18 publications

Within variety flowering time variation leads to yield variation in Sri Lankan traditional rice “Sudu wee”

Within variety flowering time variation leads to yield variation in Sri Lankan traditional rice “Sudu wee”

Morphological diversity of Sri Lankan traditional rice varieties “Pachchaperumal” and “Suduru samba”

Identification of Heterotic Groups and Patterns Based on Genotypic and Phenotypic Characteristics Among Rice Accessions of Diverse Origins

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