Enhancing Seed Yield of Hybrid Rice by Maintaining Row Ratio and Dosages of Gibberellic Acid

Abo-Youssef, Mahmoud I.; Sabagh, Ayman El; Abo-Gendy, G.; Mohamed, Abeer A.

doi:10.1515/cerce-2017-0003

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Combination between cytokines and mol bedim are plant hormones that regulate various processes of plant growth and development, which are particularly important in cell elongation (Hedden and Phillips, 2000). The results agree with those reported by Rahman et al (2010) and Abo-Youssef et al (2017). The variation between the CMS lines could be attributed to the difference in genetic background.…”

Section: Discussionsupporting

confidence: 90%

Improvement of parental lines' performance by spraying cytokinin and molybdenum on hybrid rice seed production

Hamad

Elgamal

2023

Egyptian Journal of Agricultural Research

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Field investigations were carried out at the Experimental Farm, Rice Research and Training Center, Field Crops Institute, and ARC during the growing seasons 2021 and 2022 to study the effect of cytokinin and molybdenum on hybrid seed production. The experiments comprised four treatments, viz., T1 (control), T2 (cytokinin) with a 20 ppm concentration, T3 (molybdenum) with a 35 ppm concentration, and T4 (a 1:1 mixture of cytokinin 10 ppm and molybdenum 17.5 ppm) as a pre-flowering treatment for male parent Giza 178 R and female parent for five Cytoplasmic Male Sterility (CMS) lines (IR69625, IR70368, IR58025, K17, and G46) on hybrid rice seed production. The treatments were conducted. The CMS lines were arranged in the main plots, while treatment applications were distributed in subplots and three replications. The exogenous application of treatments such as cytokinin and molybdenum could improve the crossing rates of the male parent by affecting floral traits and, accordingly, increase hybrid rice seed production. The most significant effects of treatment on anther length, anther width, pollen fertility, number fertility, stigma width, stigma length, days to heading, number of fertile tiller hills-1, plant height, panicle length, seed set, and grain yield of male parent Giza 178R were (T4), a combination between cytokinin and molybdenum. Duration of floret opining, total stigma length, stigma length, angle of floret opining, stigma width, stigma burch, days to heading, plant height, number of fertile panicles hill-1, flag leaf angle, panicle exertion, panicle length, panicle mass, seed set, seed yield, and harvest index of CMS lines were significantly affected by treatments. Moreover, the evaluated CMS lines exhibited significant differences in all measured floral traits. Line 2, Line 3, and Line 1 displayed the uppermost spikelet opening angle, duration of spikelet opening, total stigma length, style length, stigma brush, and stigma width. In addition, these CMS lines exhibited the highest plant growth and yield traits, particularly under T4. Consequently, exogenous application of T4 in combination with cytokinin and molybdenum could be exploited to improve the floral, growth, and yield traits of promising CMS lines such as Line 1, Line 3, and Line 4, thereby increasing outcrossing rates and hybrid rice seed production.

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Section: Discussionsupporting

confidence: 90%

Improvement of parental lines' performance by spraying cytokinin and molybdenum on hybrid rice seed production

Hamad

Elgamal

2023

Egyptian Journal of Agricultural Research

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“…Combining a plant ratio of 20 cm x 20 cm (P1R4) with a row ratio of 2R:14A gave the highest seed yield compared to other treatment combinations, followed by P2R4 combination which gave a good SY with no significant difference with that of P1R4. These results are in line with (Abo-Youssef et al, 2017) reported that the highest F1 seed yield was achieved at a higher ratio of A-lines, while the lowest yields of the P3R1 treatment combination was a combination of 15 cm x 15 cm plant ratio treatment with a row ratio of 2R:8A (Figure 1). This study provides information that planting density combined with spacing and row ratio of CMS provides different seed yields.…”

Section: Effects Of Interactionsupporting

confidence: 91%

Effects of row ratio and plant spacing for enhancing hybrid rice seed production in the tropics

Wibowo,

Widyastuti,

Prabowo

et al. 2024

J. Agron. Indonesia (Indonesian J. Agron.)

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The seed yield production determines the success of the development of hybrid rice. Here, an effective and efficient cultivation technology for producing hybrid rice seeds is optimized through spacing and row ratio management. This study aimed to evaluate the effects of spacing and row ratio of restorer (R) : CMS (A) on F1 hybrid rice seed production. The experiment was conducted at the Indonesian Center of Rice Research's experimental field in the dry season of 2016, using parental lines HIPA18 hybrid rice, i.e., CMS: IR79156A line and Restorer: IR53942 line. The experiment was laid out in a strip-plot design replicated three times. Two factors were studied, i.e., plant spacing between CMS lines and row ratio R by A-lines. The results indicated that the highest HIPA18 seed production was obtained from 20 cm x 20 cm spacing of CMS with row ratio 2R:14A, i.e., 3.62 tons ha-1. Plant spacing and row ratio interactions were improved tillers number per plant of restorer and F1 seed yields. Keywords: A-lines; CMS; F1 hybrid rice; R-lines

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“…In this respect, the exogenous application of GA 3 uniquely or in combination with NAA and IAA exhibited a significant increase in panicle length and panicle exertion compared to untreated plants. Similar significant positive impacts of growth regulators on panicle length panicle exertion were disclosed by Abo-Youssef et al [ 25 ], Hasan et al [ 26 ], and Pin et al [ 27 ]. Likewise, Huang et al [ 28 ] assessed the impact of IAA; NAA; indole-3-butyric acid; 2,4-dichloro-phenoxy acetic acid; 3,6-dichloro-2-methoxy-benzoic acid; and abscisic acid on the floret closure of diverse rice genotypes.…”

Section: Discussionsupporting

confidence: 79%

Growth Regulators Improve Outcrossing Rate of Diverse Rice Cytoplasmic Male Sterile Lines through Affecting Floral Traits

ElShamey

Hamad

Alshallash

et al. 2022

Plants

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Cytoplasmic male sterility (CMS) provides an irreplaceable strategy for commercial exploitation of heterosis and producing high-yielding hybrid rice. The exogenous application of plant growth regulators could improve outcrossing rates of the CMS lines by affecting floral traits and accordingly increase hybrid rice seed production. The present study aimed at exploring the impact of growth regulators such as gibberellic acid (GA3), indole-3-acetic acid (IAA), and naphthalene acetic acid (NAA) on promoting floral traits and outcrossing rates in diverse rice CMS lines and improving hybrid rice seed production. The impact of foliar applications of growth regulators comprising GA3 at 300 g/ha or GA3 at 150 g/ha + IAA at 50 g/ha + NAA at 200 g/ha versus untreated control was investigated on floral, growth, and yield traits of five diverse CMS lines. The exogenously sprayed growth regulators, in particular, the combination of GA3, IAA, and NAA (T3) boosted all studied floral, growth, and yield traits in all tested CMS lines. Moreover, the evaluated CMS lines exhibited significant differences in all measured floral traits. L2, L3, and L1 displayed the uppermost spikelet opening angle, duration of spikelet opening, total stigma length, style length, stigma brush, and stigma width. In addition, these CMS lines exhibited the highest plant growth and yield traits, particularly under T3. Consequently, exogenous application of GA3, IAA, and NAA could be exploited to improve the floral, growth, and yield traits of promising CMS lines such as L2, L3, and L1, hence increasing outcrossing rates and hybrid rice seed production.

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Enhancing Seed Yield of Hybrid Rice by Maintaining Row Ratio and Dosages of Gibberellic Acid

Abstract: ABSTRACT. The purpose of this study was to identify the optimum levels of gibberellic acid and suitable row ratio for maximization the seed yield of hybrid rice.

Cited by 4 publications

References 17 publications

Improvement of parental lines' performance by spraying cytokinin and molybdenum on hybrid rice seed production

Improvement of parental lines' performance by spraying cytokinin and molybdenum on hybrid rice seed production

Effects of row ratio and plant spacing for enhancing hybrid rice seed production in the tropics

Growth Regulators Improve Outcrossing Rate of Diverse Rice Cytoplasmic Male Sterile Lines through Affecting Floral Traits

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