Flowering synchronization in hybrid rice parental lines

Mondo, Vitor Henrique Vaz; Nascente, Adriano Stephan; Neves, P. de C. F.; Taillebois, James E.; Neto, Manoel Oliveira Alves Cardoso

doi:10.21475/ajcs.2016.10.08.p7603

Cited by 9 publications

(12 citation statements)

References 15 publications

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“…If there is a flowering gap, the problem of non-synchronization could be overcome by staggered sowing of the male parent based on the information on days to flowering [6]. Despite adjusting the sowing date, even sometimes the parents do not flower at the same time because of the differential response of the parents to stress conditions [7]. Therefore, it is essential to adjust the flowering of parental lines after observing the difference at the primordial development stage [8].…”

Section: Introductionmentioning

confidence: 99%

Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

et al. 2021

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Hybrid seed set on the female line depends primarily on its flowering synchronization with the restorer line (R), therefore, the sowing of male and female lines must be planned properly to achieve this. Field experiments on different sowing dates (May 1st, May 15th, and May 30th) of R lines (Giza 178R, Giza 179R, and Giza 181R) and cytoplasmic male sterile (CMS) lines (IR69625A, IR70368A, IR58025A, K17A, and G46A) were carried out at the farm of Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt during 2019 and 2020 to study the effect of sowing dates on flowering synchronization in hybrid rice. The results indicated that the synchronization of flowering between CMS lines and R lines has highly significant effects on the days to 50% heading, number of leaves, effective accumulated temperature (EAT), plant height, panicle exertion percentage, panicle length, number of fertile panicles, panicle weight, seed set percentage, harvest index and seed yield of hybrid rice. The highest seed yield (1.72 and 1.41 t ha−1, respectively in 2019 and 2020) was recorded from the sowing date May 1st and the hybrid combination of Giza 178R × IR58025A (2.06 and 2.12 t ha−1 in 2019 and 2020, respectively). The grain yield had a significant and highly significant positive correlation with the plant height (cm), panicle exertion percentage, panicle length, number of panicles plant−1, panicle weight, seed set percentage, and harvest index. In Egypt, May 1st is the best time for the synchronization of hybrid rice lines and a combination of Giza 178R × IR58025A may be recommended for better performance.

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Section: Introductionmentioning

confidence: 99%

Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

et al. 2021

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“…Many alternatives are being studied worldwide aiming for an increase in the field population of receptor lines that will produce rice hybrid seeds and reduce pollinator lines; this would facilitate the harvesting process and allow only hybrid rice to be harvested or would create mechanisms to Acta Scientiarum. Agronomy, v. 43, e46269, 2021 separate hybrid seeds from conventional seeds, such as the use of parental lines that are resistant to herbicide (Zhang et al, 2002), have different seed sizes (Zhu et al, 2011) or colors (Maruyama et al, 1991;Nethra et al, 2007), or have nitrogen or phosphorus-based sowing depth, plant density and fertilization (Mondo et al, 2016). Our results showed a potential technique that could be used to improve hybrid seed production, reduce cost per kg of hybrid seed and improve revenue of producing hybrid seeds.…”

Section: Discussionmentioning

confidence: 99%

“…Some alternatives have been used to reduce investment in hybrid rice, such as reducing the amount of hybrid seeds in the sowing operation from 100 kg ha -1 used in conventional fields to 50 kg ha -1 in hybrid fields (Peske & Barros, 2006;Lin, Zhu, Chen, Cheng, & Uphoff, 2009;Badshah, Tu, Zou, Ibrahim, & Wang, 2014;Goulart, Schuch, Tunes, & Vieira, 2015). However, this isolated practice did not provide significant increases in the adoption of hybrid seeds in Brazil (Coimbra et al, 2006;Mondo, Nascente, Neves, Taillebois, & Cardoso Neto, 2016). Other alternatives are being studied, such as the use of lines resistant to herbicides (Zhang, Xu, Wu, & Zhu, 2002) and parental lines with different seed sizes (Zhu, Wang, Ni, & Cheng, 2011) or different seed colors (Maruyama, Kato, & Araki, 1991;Nethra, Rajendra, Vishwanath, & Dhanraj, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Other alternatives are being studied, such as the use of lines resistant to herbicides (Zhang, Xu, Wu, & Zhu, 2002) and parental lines with different seed sizes (Zhu, Wang, Ni, & Cheng, 2011) or different seed colors (Maruyama, Kato, & Araki, 1991;Nethra, Rajendra, Vishwanath, & Dhanraj, 2007). Mondo et al (2016) studied the effects of sowing depth, plant density and fertilization with nitrogen or phosphorus as potential techniques to increase the pollen availability in the field and, consequently, the flowering synchrony between parental lines in the production of hybrid rice seeds. Authors reported that such techniques constitute potential alternatives for use in hybrid rice seed production systems and could be applied in alternated blocks of R lines in the field to obtain longer periods of pollen availability.…”

Section: Introductionmentioning

confidence: 99%

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Proportion of parental line (A receptor and R pollinator) seeds improving rice hybrid production

et al. 2020

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The high price of rice hybrid seeds is one of the major limiting factors for increasing the use of this technology. An important step toward minimizing high rice hybrid seed cost is developing techniques that help improve hybrid seed yield. Our goal was to determine the proportion of seeds of line A (receptor) and line R (pollinator) that, under mixed sowing, would allow optimized rice hybrid seed production and grain quality. Trials were performed for two growing seasons in the southern region of Brazil. The cultivar INTA Puita was used as a pollinator and line 464 A as receptor. The experimental design was a randomized block with four replications. Treatments included six proportions of seeds of the INTA Puita (0.75, 1.5, 3.0, 6.0, 12.0, and 24.00%) mixture with seeds of line 464 A (99.25, 98.50, 97.00, 94.00, 88.00, and 76%, respectively). By increasing the percentage of the pollinator seeds (INTA Puita CL) from 0.75 to 24% in the mixture with the receptor (line 464 A), we increased yield of INTA Puita CL grains (7 to 2676 kg ha-1) and hybrid seeds (279 to 1493 kg ha-1). The mixture of different proportions of INTA Puita CL (pollinator) with the receptor (line 464 A) did not change the rice grain quality or the production cost. The cost of production per kg of hybrid seeds decreased quadratically with the increasing percentage of the pollinator (INTA Puita CL), from US$ 6.71 to US$ 1.23. Revenue achieved from the commercialization of the grains of INTA Puita CL with hybrid seeds 464 A showed quadratic increases with the increased percentage of INTA Puita cl in the mixture. Our results showed a potential technique that could be used to improve hybrid seed production, reduce cost per kg of hybrid seed and improve revenue from producing rice hybrid seeds.

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“…According to Ravi et al (2007), Krishnakumar et al (2005) and Virmani (2003) in countries such as China and India, the use of hybrid rice raised the average grain yield by 15-30% compared with traditional methods. These countries are the world's largest producers of rice and their cultivation of hybrid rice is widespread and has been used by farmers for more than 20 years (Kim et al, 2007;Mondo et al, 2016). These increases in rice grain yield represent, on average, an increase in productivity from 10,000 kg to 13,000 kg ha -1 .…”

Section: Introductionmentioning

confidence: 99%

Application of herbicides on parental lines (A clearfield® and R) of hybrid rice at post-flowering stage for production

Mondo¹,

Nascente²

2019

Aust J Crop Sci

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The hypothesis of this study is based on the fact that parental line A-Clearfield® (male-sterile genotype) (Clearfield provide has tolerance to imidazolinone herbicides) and line R (male-fertile genotype-pollinator) is sensitive to the herbicide. So after flowering, we may apply an imidazolinone herbicide (Kifix®) to the plantings to kill line R, and harvesting only the hybrid seeds. The objective was to test the use of imidazolinone herbicide on parental lines (A-Clearfield® which is resistant to Kifix herbicide) and R no Clearfield® (non-resistant to Kifix genotype) as a strategy to improve production of hybrid seed in rice. Two trials were conducted to evaluate (A) the use of doses of imidazolinone herbicide in line R (plant control, number of grains per panicles, grain yield and seed germination; and (B) the use of different doses of imidazolinone herbicide in line A Clearfield® grain yield and seed germination. Trials were conducted in the tropical region of Brazil in randomized complete block design in factorial scheme 5 x 2 x 2. The treatments were the combination of five Kifix (Imazapyr, 525 g kg-1 + Imazapic, 175 g kg-1) rates applied on two no Clearfield® rice genotypes (first trial) or Clearfield® rice genotypes (second trial) in two growing seasons. The results showed application of herbicide doses higher than 150 g ha-1 after full flowering stage can cause reduction in growth and development of no Clearfield® rice. The use of Kifix herbicide in CL (Clearfield®) rice cultivars did not affect the grain yield, mass of 1000 grains, seed germination, first count germination, seedling emergence and seedling length. New researches should be done to define plant arrangement suitable for line R (no Clearfield®) and line A Clearfield® to find the optimum condition to produce hybrid seeds. From our results, we could see that the use of parental line A Clearfield® with a line R no Clearfield®, after flowering, provided the production of only hybrid seeds in the area, without reduction in seed quality.

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Flowering synchronization in hybrid rice parental lines

Cited by 9 publications

References 15 publications

Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

Flowering Synchronization in Hybrid Rice Parental Lines at Different Sowing Dates

Proportion of parental line (A receptor and R pollinator) seeds improving rice hybrid production

Application of herbicides on parental lines (A clearfield® and R) of hybrid rice at post-flowering stage for production

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