Importance of anaerobic seed germination and seedling development in direct-seeded rice with special reference to Sri Lanka

Illangakoon, T. K.; Marambe, B.; Keerthisena, R. S. K.; Kumar, Virender

doi:10.4038/sljfa.v5i2.76

Cited by 6 publications

(4 citation statements)

References 33 publications

(69 reference statements)

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“…Japonica rice varieties have been observed to elongate their coleoptiles faster than indica varieties under flood conditions ( Hsu and Tung, 2015 ). However, the full potential of local rice germplasms for germination and seedling development under flooded conditions remains largely untapped ( Illangakoon et al., 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Genomic landscape of the OsTPP7 gene in its haplotype diversity and association with anaerobic germination tolerance in rice

Aung

Maung

et al. 2023

Front. Plant Sci.

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Early season flooding is a major constraint in direct-seeded rice, as rice genotypes vary in their coleoptile length during anoxia. Trehalose-6-phosphate phosphatase 7 (OsTPP7, Os09g0369400) has been identified as the genetic determinant for anaerobic germination (AG) and coleoptile elongation during flooding. We evaluated the coleoptile length of a diverse rice panel under normal and flooded conditions and investigated the Korean rice collection of 475 accessions to understand its genetic variation, population genetics, evolutionary relationships, and haplotypes in the OsTPP7 gene. Most accessions displayed enhanced flooded coleoptile lengths, with the temperate japonica ecotype exhibiting the highest average values for normal and flooded conditions. Positive Tajima’s D values in indica, admixture, and tropical japonica ecotypes suggested balancing selection or population expansion. Haplotype analysis revealed 18 haplotypes, with three in cultivated accessions, 13 in the wild type, and two in both. Hap_1 was found mostly in japonica, while Hap-2 and Hap_3 were more prevalent in indica accessions. Further phenotypic performance of major haplotypes showed significant differences in flooded coleoptile length, flooding tolerance index, and shoot length between Hap_1 and Hap_2/3. These findings could be valuable for future selective rice breeding and the development of efficient haplotype-based breeding strategies for improving flood tolerance.

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Section: Discussionmentioning

confidence: 99%

Genomic landscape of the OsTPP7 gene in its haplotype diversity and association with anaerobic germination tolerance in rice

Aung

Maung

et al. 2023

Front. Plant Sci.

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“…Galur padi dengan toleransi AG dapat dilihat berdasarkan kemampuannya menghasilkan akar dan tunas (Illangakoon et al, 2019). Berta dan Ismail (2013) menyatakan bahwa karakter akar seperti panjang akar dapat digunakan untuk menentukan galur yang toleran.…”

Section: Toleransi Galur-galur Padi Terhadap Anaerobic Germination (Ag)unclassified

“…Panjang akar berkorelasi nyata dan positif dengan panjang tunas (r = 0.609) dan bobot biomassa (r = 0.684), sedangkan panjang tunas memiliki hubungan yang lemah dengan biomassa dengan nilai r = 0.363 (Tabel 3). Meskipun demikian, panjang tunas merupakan salah satu karakter penting dalam kriteria seleksi toleransi terhadap AG (Ismail et al, 2012;Illangakoon et al, 2019). Toleransi genotipe diseleksi berdasarkan persentase tumbuh tinggi, tunas yang panjang, atau biomassa yang berat.…”

Section: Toleransi Galur-galur Padi Terhadap Anaerobic Germination (Ag)unclassified

Penampilan Agronomi Galur-Galur Padi Sawah Tadah Hujan Toleran Kondisi Anaerob pada Fase Perkecambahan

Sitaresmi

Kartina

Yuningsih

et al. 2021

J. Agron. Indonesia

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Budidaya padi di sawah tadah hujan dengan sistem tebar benih langsung memerlukan varietas yang beradaptasi baik pada kondisi ekosistem tersebut dan toleran terhadap tingkat oksigen rendah selama berkecambah atau anaerobic germination (AG). Penelitian bertujuan mengevaluasi penampilan agronomi galur-galur padi dilakukan di sawah tadah hujan, serta toleransinya terhadap kondisi AG. Evaluasi toleransi cekaman kondisi anaerob dilakukan di rumah kaca BB Padi pada bulan Februari 2020. Materi yang digunakan adalah 12 genotipe padi. Penapisan AG dilakukan dengan merendam benih dalam air dengan ketinggian 10 cm selama 10 hari. Pengujian daya hasil dilakukan di sawah tadah hujan Sumedang dan Pati pada musim hujan 2020. Percobaan disusun menggunakan rancangan kelompok lengkap teracak dengan empat ulangan. Toleransi terhadap kondisi AG dapat diidentifikasi berdasarkan karakter persentase daya pulih, panjang tunas dan akar, dan biomassa. Karakter-karakter tersebut saling berkorelasi nyata, positif, dan kuat. Galur IR 83381-B-B-6-1, IR 129336:11-19-Ski-0-Kn-3 dan B14897E-SKI-9-7-2 memiliki toleransi AG lebih baik daripada Inpari 30 dan Inpari 39. Dari hasil pengujian lapangan, dua galur memiliki rata-rata GKG setara dengan Inpari 30 dan Inpari 39, serta konsisten cukup tinggi yaitu IR 129336:11-19-Ski-0-Kn-3 (5.61 ton ha-1) dan B14316E-KA-15 (6.04 ton ha-1). Hasil pengujian ini dapat dilanjutkan dengan uji multi lokasi pada galur IR 83381-B-B-6-1, IR 129336:11-19-Ski-0-Kn-3 dan B14897E-SKI-9-7-2 dengan mempertimbangkan daya hasil dan adaptasinya sehingga dapat dilepas menjadi varietas toleran AG. Kata kunci: cekaman abiotik, perkecambahan anaerob, tebar benih langsung

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“…Apart from the recommended seed broadcast-DOI: http://doi.org/10. 4038/tare.v26i1.5615 ing rate of 100 kg ha -1 given by the Department of Agriculture (DOA), farmers are adopted to use different seeding rates for cultivation mostly more than the recommended rate (Illangakoon 2020). Rice seed rate greatly influence for plant density and the competition of different crop stands such as tiller count per unit area, time taken to maturity and yield advantage (Gupta 2006).…”

Section: Introductionmentioning

confidence: 99%

Growth Performances and Grain Yield Response of Rice Varieties (<em>Oryza sativa</em> L.) Established at Different Seed Broadcasting Rates in Irrigated Fields of Low Country Dry Zone of Sri Lanka

Kumara¹,

Hafeel²,

Herath³

et al. 2023

Trop Agric Res & Ext

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Seed broadcasting rate has an enormous influence on rice plant density and the competition of the crop stands, tiller number, time taken to maturity and grain yield. Relatively low plant densities due to inappropriate sowing methods are the most significant aspects of agronomic restrictions for obtaining higher grain yields and weed competitiveness. A research study was conducted in Maha 2019/20 and Maha 2020/21 seasons to study the effect of different seed broadcasting rates on the yield and weed competitiveness of rice. The experiment was established with 3 different seed broadcasting rates 100, 150 and 200 kg ha -1 for the rice variety At 362 (Long grain) and 75, 112.5 and 150 kg ha -1 for the rice variety At 307 (Intermediate grain). The experiment was conducted under the irrigated condition of the low country dry zone of Sri Lanka in imperfectly drained reddish brown and low humic gley soils at the Rice Research Station (RRS), Ambalantota. Parallel to the research field experiment, recommendation and farmer practiced seed broadcasting rates (100 and 150 kg ha -1 ) were evaluated at farmers' fields using rice variety At 362. Grain yield, plant height, tiller count, filled and unfilled grain per panicle, spikelet count per panicle, 1000 grains weight and weed performance were determined. Results of this experiment have shown that elevated seed rates beyond 100 kg ha -1 do not improve the tiller count, effective panicles or the grain yield of two rice varieties At 362 and At 307. Diseases like sheath blight may affect the rice crop more severely causing significant yield losses in favourable weather with increased populations (150 kg ha -1 ). Therefore, a 100 kg ha -1 seed broadcasting rate can be recommended as the best seed rate for farmer field cultivation where better weed management practices are adopted. Finally, the results of this experiment reconfirmed that exceeding the recommended seed broadcasting rates of 100 kg ha -1 or 75 kg ha -1 for At 362 or At 307 respectively will not be effective to get a higher yield response from paddy under irrigated conditions in the dry zone. Recommended seed application rate of 100 kg ha -1 for long grain rice and 75 kg h -1 for intermediate grain rice in the paddy farming system had been recorded as cost effective seed broadcasting rates.

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Importance of anaerobic seed germination and seedling development in direct-seeded rice with special reference to Sri Lanka

Cited by 6 publications

References 33 publications

Genomic landscape of the OsTPP7 gene in its haplotype diversity and association with anaerobic germination tolerance in rice

Genomic landscape of the OsTPP7 gene in its haplotype diversity and association with anaerobic germination tolerance in rice

Penampilan Agronomi Galur-Galur Padi Sawah Tadah Hujan Toleran Kondisi Anaerob pada Fase Perkecambahan

Growth Performances and Grain Yield Response of Rice Varieties (<em>Oryza sativa</em> L.) Established at Different Seed Broadcasting Rates in Irrigated Fields of Low Country Dry Zone of Sri Lanka

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