Source–sink relationships in short-duration and hybrid rice cultivars in tropical Asia

Won, Phyo L.P.; Kanno, Noriko; Banayo, Niño P.M.C.; Bueno, Crisanta Sunio; Cruz, Pompe Sta.; Kato, Yoichiro

doi:10.1016/j.fcr.2022.108485

Cited by 14 publications

(5 citation statements)

References 34 publications

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“…Due to reduced photo assimilation and reduced tiller number highly impacted on the panicle number of the rice that leads to reduced panicle size and resulted in reduction of other yield contributing characters. This finding corroborates with the earlier findings of Won et al (2022) who reported that the greater sink size the higher is the grains panicle -1 . Combined effect of varieties and leaf cutting on yield contributing characteristics of rice.…”

Section: Effect Of Leaf Cutting On Yield Contributing Parameters Of Ricesupporting

confidence: 93%

Growth and Yield Response of Selected Aman Varieties as Influenced by Leaf Cutting

Hossain

Masud

Islam

et al. 2023

Bangladesh Agron. J.

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Sustainable crop production in the era of increasing input price is adding extra burden while the cultivable land is reducing at an alarming pace. This research article aims to test the hypothesis that the leaf cutting as an agronomic practice could be a better prospective in increasing rice grain production. An experiment was carried out in the experimental field of Sher-e-Bangla Agricultural University, to assess the effect of leaf cutting on plant growth and yield of selected BRRI released Aman varieties. The experiment consisted of five rice varieties namely BRRI dhan32, BRRI dhan33, BRRI dhan39, BRRI dhan62, and BRRI dhan56 treated either as control or leaf cutting (except flag and penultimate leaf). The experiment was laid out in randomized complete block design (RCBD) with three replicates. Leaf cutting was observed with detrimental effect on the usual plant growth and yield performances. Irrespective of all studied varieties, the highest value was obtained while no leaf cutting was performed. BRRI dhan39 was found to be the highest yield producing variety in terms of greater flag leaf length, leaf breadth, flag leaf area, required less time to grain filling, filled grain panicle-1, filled grain%, 1000-grain weight, grain yield and harvest index in leaf cutting condition followed by BRRI dhan32 in terms of plant height, chlorophyll content, tiller hill-1 and straw yield. No significant differences in yield contributing parameters except the panicle hill-1 were observed in leaf cutting condition compared to control. Leaf cutting at heading (except flag leaf and penultimate leaves) reduced average 10-20% loss of grain yield. BRRI dhan62 shown highly affected by leaf cutting compared to the rest other varieties. Therefore, it can be concluded by suggesting that leaf cutting reduces plant functional efficiency which can be improved by enhancing photosynthetic capacity through proper management of leaf architecture. Bangladesh Agron. J. 2022, 25(2): 1-9

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Section: Effect Of Leaf Cutting On Yield Contributing Parameters Of Ricesupporting

confidence: 93%

Growth and Yield Response of Selected Aman Varieties as Influenced by Leaf Cutting

Hossain

Masud

Islam

et al. 2023

Bangladesh Agron. J.

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“…During this period, irrigation brine significantly inhibits the absorption and utilization of nitrogen, the accumulation of carbohydrates in the early stage of grain filling, and the development of photosynthetic organs after the heading is blocked. The stunted growth of rice nutrients leads to the weakened source-sink relationship and limits the rice filling process degrading rice quality ( Won et al., 2022 ). The in-compaction of endosperm tissue leads to decreased starch accumulation, increased chalkiness grain rate, and chalkiness area ( Fahad et al., 2019 ), and easy breakage in the processing process and milling leads to the low yield of whole rice.…”

Section: Discussionmentioning

confidence: 99%

Rice yield penalty and quality deterioration is associated with failure of nitrogen uptake from regreening to panicle initiation stage under salinity

et al. 2023

Front. Plant Sci.

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In recent years, the development and utilization of saline land for rice cultivation have effectively expanded grain productivity. Rice is a salt-sensitive crop, and the increasing salinity problem threatens rice yield and quality. Therefore, we conducted open field experiments to study the effect of salinity on different growth stages of rice. Irrigating saline treatment was conducted at three different growth stages: irrigating saline from the regreening stage to the panicle initiation stage (S1), irrigating saline from the panicle initiation stage to the flowering stage (S2), and irrigating saline from the flowering stage to the maturity stage (S3). Each treatment period lasted for about 30 days. At the same time, irrigating saline water from the regreening stage to the maturity stage (S4) treatment was added in 2022 to explore the performance of salt stress during the whole growth period of rice. Based on the treatment of these different saline irrigation growth periods, three saline concentrations were incorporated, including salinity 0‰ (T1), 3‰ (T2), and 6‰ (T3) concentrations. No irrigating saline during the whole growth period was also used as a control (CK). The results indicated that rice grain yield and quality were most sensitive to saline treatment during S1 among the three stress periods. At the S1 stage, salinity mainly reduced the nitrogen uptake, resulting in stunted plant growth, reducing tillering, yield, and yield components, and deteriorating the rice quality. Compared to the control, IEN (grain yield over the total amount of N uptake in plants at maturity) was more sensitive at the S1 stage than S2 and S3 stages under salinity. Furthermore, the findings of our study suggest that under salinity, rice growth is not only directly affected by the higher sodium (Na+) content in plants, but the higher concentration of Na+ reduced the ability of plants to uptake nitrogen. Thus, more attention should be paid to the field management of the S1 stage, the most sensitive stage during rice cultivation in salinized areas. It is necessary to avoid salt damage to rice during this period and ensure irrigation with precious freshwater resources.

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“…1 ). Improving source supply has become an important way to promote inferior grain filling and crop yield (Fu et al 2011 ; Won et al 2022 ; Slafer et al 2023 ). Thus, it is necessary to deeply understand the relationship of source supply and inferior grain growth.…”

Section: Discussionmentioning

confidence: 99%

The Inferior Grain Filling Initiation Promotes the Source Strength of Rice Leaves

Jiang,

Yang,

Zhu

et al. 2023

Rice

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Poor grain-filling initiation in inferior spikelets severely impedes rice yield improvement, while photo-assimilates from source leaves can greatly stimulate the initiation of inferior grain-filling (sink). To investigate the underlying mechanism of source-sink interaction, a two-year field experiment was conducted in 2019 and 2020 using two large-panicle rice cultivars (CJ03 and W1844). The treatments included intact panicles and partial spikelet removal. These two cultivars showed no significant difference in the number of spikelets per panicle. However, after removing spikelet, W1844 showed higher promotion on 1000-grain weight and seed-setting rate than CJ03, particularly for inferior spikelets. The reason was that the better sink activity of W1844 led to a more effective initiation of inferior grain-filling compared to CJ03. The inferior grain weight of CJ03 and W1844 did not show a significant increase until 8 days poster anthesis (DPA), which follows a similar pattern to the accumulation of photo-assimilates in leaves. After removing spikelets, the source leaves of W1844 exhibited lower photosynthetic inhibition compared to CJ03, as well as stronger metabolism and transport of photo-assimilates. Although T6P levels remained constant in both cultivars under same conditions, the source leaves of W1844 showed notable downregulation of SnRK1 activity and upregulation of phytohormones (such as abscisic acid, cytokinins, and auxin) after removing spikelets. Hence, the high sink strength of inferior spikelets plays a role in triggering the enhancement of source strength in rice leaves, thereby fulfilling grain-filling initiation demands.

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Source–sink relationships in short-duration and hybrid rice cultivars in tropical Asia

Cited by 14 publications

References 34 publications

Growth and Yield Response of Selected Aman Varieties as Influenced by Leaf Cutting

Growth and Yield Response of Selected Aman Varieties as Influenced by Leaf Cutting

Rice yield penalty and quality deterioration is associated with failure of nitrogen uptake from regreening to panicle initiation stage under salinity

The Inferior Grain Filling Initiation Promotes the Source Strength of Rice Leaves

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