Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Watanabe, Hajime; Honma, Kae; Adachi, Yusuke; Fukuda, Akari

doi:10.1080/1343943x.2018.1520048

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…Also, the contents of starch, sucrose, and glucose gradually decreased (Fig. 7), which was similar to previous findings (Watanabe et al 2018, Orsák et al 2021, Qureshi et al 2021. For example, Fan et al (2005) found that the contents of reducing sugar and total soluble sugar gradually decreased in wheat leaves with the prolongation of waterlogging stress.…”

Section: Discussionsupporting

confidence: 91%

Mitigative effect of 6-benzyladenine on photosynthetic capacity and leaf ultrastructure of maize seedlings under waterlogging stress

WANG¹,

WANG²,

WANG³

et al. 2022

Photosynt.

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6-Benzyladenine (6-BA) is an artificial synthetic cytokinin, which plays an important role in regulating plant responses to abiotic stress. This study aimed to investigate the mitigative effect of exogenous 6-BA on photosynthetic capacities and leaf ultrastructure under waterlogging stress using two waxy corn inbred lines. The results showed that waterlogging stress disrupted the photosynthesis of waxy corn seedlings. However, exogenous 6-BA alleviated the inhibition caused by waterlogging stress. Under the waterlogging conditions, 6-BA treatment of plants helped preserve the structural integrity of the chloroplasts and retain higher contents of photosynthetic pigments. It also increased the photosynthetic capacity and promoted the openness of stomatal pores. Moreover, exogenous 6-BA promoted photosynthetic activities and the accumulation of carbohydrates. The results revealed that the detrimental effects of waterlogging stress on maize seedlings can be alleviated by 6-BA via modulating photosynthetic activities. Highlights• Two waxy corn inbred lines were used in this study • Exogenous 6-BA improved photosynthetic capacity and leaf ultrastructure • Exogenous 6-BA alleviated the waterlogging-induced damages of waxy corn seedlings

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Section: Discussionsupporting

confidence: 91%

Mitigative effect of 6-benzyladenine on photosynthetic capacity and leaf ultrastructure of maize seedlings under waterlogging stress

WANG¹,

WANG²,

WANG³

et al. 2022

Photosynt.

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“…Wang et al (2009) found that Os01g0939200 is responsible for ethylene and GA signaling. Indeed, exogenous GA application has been found to strongly stimulate the elongation of the mesocotyl and coleoptile in rice (Watanabe et al, 2007;Watanabe et al, 2018), which is consistent with our observations that these two GA-related genes confer increased seedling emergence under deep-sowing.…”

Section: Gene Categorysupporting

confidence: 92%

Genome-wide association analysis for emergence of deeply sown rice (Oryza sativa) reveals novel aus-specific phytohormone candidate genes for adaptation to dry-direct seeding in the field

et al. 2023

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Dry direct-seeded rice (dry-DSR) is typically sown deeply to circumvent the need for irrigation, and thus seedling emergence is a crucial trait affecting plant stand and yield. To breed elite cultivars that use less water and are climate-resilient, an understanding of the genomic regions and underlying genes that confer emergence in deeply sown dry-DSR would be highly advantageous. A combined diversity panel of 470 rice accessions (RDP1 plus aus subset of 3K RGP) was evaluated with 2.9 million single nucleotide polymorphisms (SNPs) to identify associations with dry-DSR traits in the field and component traits in a controlled-environment experiment. Using genome-wide association study (GWAS) analyses, we identified 18 unique QTLs on chromosomes 1, 2, 4, 5, 6, 7, 9, 10, and 11, explaining phenotypic variance ranging from 2.6% to 17.8%. Three QTLs, namely, qSOE-1.1, qEMERG-AUS-1.2, and qEMERG-AUS-7.1, were co-located with previously reported QTLs for mesocotyl length. Among the identified QTLs, half were associated with the emergence of aus, and six were unique to the aus genetic group. Based on functional annotation, we identified eleven compelling candidate genes that primarily regulate phytohormone pathways such as cytokinin, auxin, gibberellic acid, and jasmonic acid. Prior studies indicated that these phytohormones play a critical role in mesocotyl length under deep sowing. This study provides new insight into the importance of aus and indica as desirable genetic resources to mine favorable alleles for deep-sowing tolerance in rice. The candidate genes and marker-tagged desirable alleles identified in this study should benefit rice breeding programs directly.

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“…Priming pigeon pea seeds with 10 mM ET (chloroethylphosphonic acid) increased the germination percentage under Cd stress conditions [ 26 ]. The combined application of ethephon and gibberellic acid to rice seeds increased α-amylase activity and sugar content [ 89 ]. Manoharlal and Saiprasad [ 161 ] reported that priming with ethephon improved the germination of soybean seeds.…”

Section: Commonly Used Pgrs In Seed Primingmentioning

confidence: 99%

Seed Priming with Phytohormones: An Effective Approach for the Mitigation of Abiotic Stress

Rhaman

Imran

Rauf

et al. 2020

Plants

168

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Plants are often exposed to abiotic stresses such as drought, salinity, heat, cold, and heavy metals that induce complex responses, which result in reduced growth as well as crop yield. Phytohormones are well known for their regulatory role in plant growth and development, and they serve as important chemical messengers, allowing plants to function during exposure to various stresses. Seed priming is a physiological technique involving seed hydration and drying to improve metabolic processes prior to germination, thereby increasing the percentage and rate of germination and improving seedling growth and crop yield under normal and various biotic and abiotic stresses. Seed priming allows plants to obtain an enhanced capacity for rapidly and effectively combating different stresses. Thus, seed priming with phytohormones has emerged as an important tool for mitigating the effects of abiotic stress. Therefore, this review discusses the potential role of priming with phytohormones to mitigate the harmful effects of abiotic stresses, possible mechanisms for how mitigation is accomplished, and roles of priming on the enhancement of crop production.

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Effects of combinational treatment with ethephon and gibberellic acid on rice seedling growth and carbohydrate mobilization in seeds under ﬂooded conditions

Cited by 7 publications

References 26 publications

Mitigative effect of 6-benzyladenine on photosynthetic capacity and leaf ultrastructure of maize seedlings under waterlogging stress

Mitigative effect of 6-benzyladenine on photosynthetic capacity and leaf ultrastructure of maize seedlings under waterlogging stress

Genome-wide association analysis for emergence of deeply sown rice (Oryza sativa) reveals novel aus-specific phytohormone candidate genes for adaptation to dry-direct seeding in the field

Seed Priming with Phytohormones: An Effective Approach for the Mitigation of Abiotic Stress

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