Seedling Growth and Dry-Matter Production under Drained Conditions in Rice Direct-Sown into Puddled and Leveled Soil

Satô, Tôru; Maruyama, Sachio

doi:10.1626/pps.8.209

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…In this research, significant difference was not found in mean emergence time of primed and control seed in wooden boxes experiment ( Figure 6). Shoots elongation is inhibited, but root growth is stimulated at the time of seedling emergence with a decrease in soil moisture content [26] [27]. Seedling shoots in our study may have had difficulty in elongating at the time of seedling emergence, even though they had been primed.…”

Section: Effects Of Hydropriming On Emergence and Initial Growthmentioning

confidence: 66%

“…However, plants from primed seeds grew better than those from control seeds after emergence ( Table 2). Drainage after sowing accelerates root growth at the time of seedling emergence, but promotes shoot growth after seedling emergence [27]. Regardless of soil moisture condition, shoot growth in plants with primed seeds was greater than that in those obtained with control seeds [7].…”

Section: Effects Of Hydropriming On Emergence and Initial Growthmentioning

confidence: 94%

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Development of Hydropriming Techniques for Sowing Seeds of Upland Rice in Uganda

Nakao¹,

Asea²,

Yoshino³

et al. 2018

AJPS

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Hydropriming is one of the presoaking, seed priming technique that allows seeds to imbibe water and go through the first stage of germination but does not allow radicle appearance. After water imbibition, seeds are dried to their original weight. This technique is used to help crops overcome environment stress. This study aims to assess the morphological traits of farmer's seeds for developing priming treatments so as to develop appropriate methods to maximize the effect of hydropriming. We collected farmer's samples of rice sowing seeds grown indifferent regions of Ugandan. For each sample, distribution of the seed density in percentages was calculated. Secondly, germination tests as per seed density levels and as per farmer's seed samples were conducted for deciding appropriate priming treatment. Finally, wooden boxes experiment was conducted to confirm priming effects. As the result, it was observed that the difference in seed density levels affects the quality of farmer's seeds, as observed in the case of NERICA4. If the radicle appears during soaking period, the newly developed radicle dies during the seed drying process in the hydropriming treatment. Seed germination was observed after 24 h of sowing at room temperature, even at a seed density level of 1.17, which is vigorous for germination. Consequently, farmer's seeds were soaked for 24 h to promote water absorption and activate metabolic pathways and to avoid germination failure when seeds are dried to their initial weight. After hydropriming treatment, plant growth was improved. Alternatively, significant difference was not observed in the mean emergence time between hydroprimed and unprimed seeds. These results suggest that priming the seeds by soaking for 24 h and drying to their initial weight considerably affects initial growth after emergence under dry soil condition.

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Section: Effects Of Hydropriming On Emergence and Initial Growthmentioning

confidence: 66%

Section: Effects Of Hydropriming On Emergence and Initial Growthmentioning

confidence: 94%

Development of Hydropriming Techniques for Sowing Seeds of Upland Rice in Uganda

Nakao¹,

Asea²,

Yoshino³

et al. 2018

AJPS

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“…This result shows that the reaction to soil moisture was different for shoot and root growth. Maruyama (2002, 2005) reported that root dry weight decreases with an increase in soil moisture content and is lower in flooded than in drained soil [41,42]. However, the gradients of the correlations were larger in the soaking and priming seeds than those in the control (Figure 2(e)).…”

Section: Relationship Between Soil Moisture and Seedling Vigor Followmentioning

confidence: 90%

“…Furthermore, roots appear to demonstrate decreased growth with decreasing pF [45]. Based on these observations and the report of Sato and Maruyama (2005), it is reasonable to say that the T/R ratio is a single negative curve, as shown in the control and soaking seeds (Figure 2(f)) [42]. However, the correlation between soil moisture content and the T/R ratio in the priming seeds showed a positive linear regression (Figure 2(f)).…”

Section: Relationship Between Soil Moisture and Seedling Vigor Followmentioning

confidence: 91%

Effects of Seed Hydropriming on Germination and Seedling Vigor during Emergence of Rice under Different Soil Moisture Conditions

Matsushima¹,

Sakagami²

2013

AJPS

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Seed priming is a physiological seed enhancement method. Hydro-or osmotic priming can advance germination under adequate moisture conditions. During direct seeding on well-drained paddy and upland fields, rice seeds occasionally encounter low soil moisture conditions. Under these conditions, rice seeds need to undergo rapid germination and secure emergence through improved water absorption capacity and seed bioactive. This study aims to clarify the effects of seed hydropriming on germination and seedling vigor in rice under different soil moisture conditions. The study employed three hydration conditions such as priming, soaking, and control. The seeds to be primed and soaked were submerged in tap water at 30˚C for 12 h. For priming, the seeds were subsequently dried to attain their initial seed weight, but the seeds for soaking were not dried before sowing, and the control seeds were untreated. In addition, different soil moisture conditions, such as 3%, 6%, 8%, 11%, 15%, and 20%, were set. Therefore, emergence time shortened with seed priming at 3% -11% soil moisture contents. In particular, at 8% soil moisture content, priming and soaking decreased emergence time by 26.8 h and 21.7 h, respectively compared with that of the control. At 8% -15% soil moisture contents, shoot elongation rate obtained with the priming seeds increased >1.2 times compared with that obtained with the control and soaking seeds. At >8% soil moisture content, shoot dry weight obtained with the priming seeds increased >1.3 times compared with that obtained with the soaking seeds. Furthermore, at declining soil moisture conditions, the increase in root dry weight is promoted by seed priming compared with that in the control seeds. These results suggest that increased root growth affects plant water absorption under low soil moisture conditions due to priming. This study demonstrates that seed priming facilitates rapid emergence and seedling vigor, unless extremely dry or flooded soil moisture conditions are present at seeding.

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“…A major problem encountered with direct sowing in a flooded–puddled paddy field is inconsistent seedling emergence (Yamauchi et al , 1993). The seedling emergence in puddled paddy soils was observed to decline dramatically when the seeds have gone below 10-mm mainly due to poor oxygen concentration (Sato and Maruyama, 2005). Identification of low oxygen tolerant rice germplasm with better seedling emergence would, therefore, be more beneficial under flooded paddy fields.…”

Section: Introductionmentioning

confidence: 99%

Rice (Oryza sativa L.) germplasm with better seedling emergence under direct sowing in flooded paddy field

Kashiwagi

Hamada

Jitsuyama

2018

Plant Genet. Resour.

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Direct sowing of rice in a flooded paddy field is a beneficial cultivation practice for water use and labour efficiency, compared to the transplanted cultivation. However, a drastic reduction in seedling emergence under flooded paddy fields is a serious constraint especially when the seeds fell at deeper soil layers. Suitable rice germplasm for the direct sowing in flooded paddy fields could ensure the success of this cultivation practice. Instead of laborious field-based screening systems, a pot-based screening method was adopted for simplicity and efficient evaluation of seedling emergence of a subset of world rice germplasm (n = 75) at different sowing depths. As a result, two rice genotypes, ‘Vary Futsi’ (landrace from Madagascar, non-glutinous, subspecies Indica) and ‘Dahonggu’ (landrace from China, non-glutinous, subspecies Indica), with consistently better seedling emergence were identified from a wide range of rice germplasm. These genotypes could serve as excellent parents for the breeding program in developing new rice cultivars with the improved seedling emergence in flooded paddy fields. There were no significant differences in the seedling emergence rate in flooded paddy conditions among the groups from various agro-geographical regions.

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Seedling Growth and Dry-Matter Production under Drained Conditions in Rice Direct-Sown into Puddled and Leveled Soil

Cited by 7 publications

References 13 publications

Development of Hydropriming Techniques for Sowing Seeds of Upland Rice in Uganda

Development of Hydropriming Techniques for Sowing Seeds of Upland Rice in Uganda

Effects of Seed Hydropriming on Germination and Seedling Vigor during Emergence of Rice under Different Soil Moisture Conditions

Rice (Oryza sativa L.) germplasm with better seedling emergence under direct sowing in flooded paddy field

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