Genetic variability for and tolerance to anaerobic germination in rice (<i>Oryza sativa</i> L.)

Asante, Maxwell Darko; Ipinyomi, Samuel Oluwasegun; Abe, Ayodeji; Adjah, Kossi Lorimpo; Aculey, Phyllis; Bam, Raphael Kwame; Manneh, Baboucarr

doi:10.1080/15427528.2021.1884631

Cited by 6 publications

(11 citation statements)

References 28 publications

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“…This analytic output suggests that these traits are complex in nature and are highly influenced by the environment. Earlier studies also found that traits associated with anaerobic germination potential had moderate-to-high heritability ( Darko Asante et al., 2021 ). Of the 14 traits studied, 10 had an h 2 > 0.60, indicating that phenotypic selection is effective for these traits under anaerobic stress.…”

Section: Discussionmentioning

confidence: 97%

“…(2010) ; Barik et al. (2019) , and Darko Asante et al. (2021) also studied rice accessions for AG tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…During this phenomenon multiple processes occur, including the synthesis of cell walls and the uptake of solutes, which are less energy-demanding than protein synthesis. This might be due to the production of ethylene, which in turn triggers rapid shoot elongation in the germinating seeds in order to escape the hypoxia condition ( Ismail et al., 2009 ; Darko Asante et al., 2021 ). The elongating coleoptiles behave as snorkels; they come into direct contact with air and facilitate gas exchange, enabling the embryos to develop ( Mondal et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

“…It was also noticed in this study that the landraces with longer shoots had higher AGP values. This condition is primarily due to the rapid elongation of the shoots under submergence; rapid shoot elongation has been identified as an indicator of AGT ( Ismail et al., 2009 ; Barik et al., 2019 ; Darko Asante et al., 2021 ). The high mean values for response index expressed by the tolerant and moderately tolerant groups further substantiate the importance of shoot elongation among AGT groups.…”

Section: Discussionmentioning

confidence: 99%

“…This finding infers that the Sub1 gene introgressed genotypes that were unable to cope with submergence during the germination process, despite being tolerant to vegetative-stage submergence. Sub1 locus-conferring genotypes undergo a quiescent strategy ( Fukao et al., 2006 ) that conserves carbohydrates ( Ella et al., 2003 ; Sarkar and Bhattacharjee, 2011 ; Darko Asante et al., 2021 ). These genotypes resume growth by activating and using ethylene production rather than shoot elongation after submergence subsides.…”

Section: Discussionmentioning

confidence: 99%

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Unraveling the genetic potential of native rice (Oryza sativa L.) landraces for tolerance to early-stage submergence

Shanmugam,

Manivelan,

Deepika

et al. 2023

Front. Plant Sci.

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Direct-seeded rice (DSR) is a promising alternative to the traditional puddled rice system. It has become more popular among rice growers as a result of socioeconomic shifts and global climate change. Although DSR offers advantages, rice plants experience greater anaerobic stress at sowing from unpredicted rainfall. Rice is unique among cereals in its ability to germinate under anaerobiosis. The coleoptile of rice rapidly elongates above the water surface to obtain more oxygen and enhance vigorous seedling growth. A panel of 115 landraces and four check varieties were subjected to anaerobic stress with a water level of 10 cm for up to 15 days. The present study observed significant variation in anaerobic germination percentage (AGP) (10%–100%) and anaerobic vigor index (AVI) (150–4,433). Landraces Karuthakar, Poovan samba, Mattaikar, Edakkal, Manvilayan, and Varappu kudainchan were identified as genotypes tolerant to early water submergence. The shoot and root length of susceptible landraces were significantly lower than the tolerant landraces under hypoxia condition, implying that landraces with longer shoots and roots had a higher survival rate. The response index substantiated this. The results clearly show that tolerant and moderately tolerant landraces possessed higher mean values for root and shoot lengths than susceptible landraces. The landraces grouped under the long–bold category had superior AGP and AVI scores to other grain type groups. This raises the possibility that differences in kernel breadth, which is linked to grain type, could affect anaerobic germination potential. Molecular confirmation using gene-specific markers, viz., DFR, TTP_G4, RM478, RM208, and RM24161, for which the polymorphic information content (PIC) value ranged from 0.36 (RM478) to 0.68 (RM206) suggests that this diverse panel of landraces must be assessed further using advanced molecular tools to precisely clarify the genetic mechanism behind this phenomenon. The tolerant landraces thus identified may become donors in breeding programs. The introduction of these traits would contribute to the development of rice varieties tolerant to anaerobic stress, resulting in sustainable yields. This solution could promote the DSR system across the world.

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Section: Discussionmentioning

confidence: 97%

“…(2010) ; Barik et al. (2019) , and Darko Asante et al. (2021) also studied rice accessions for AG tolerance.…”

Section: Discussionmentioning

confidence: 99%