scholarly journals Exogenous application of zinc (Zn) at the heading stage regulates 2-acetyl-1-pyrroline (2-AP) biosynthesis in different fragrant rice genotypes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Haowen Luo ◽  
Bin Du ◽  
Longxin He ◽  
Jing He ◽  
Lian Hu ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Foliar Application ◽  
Grain Filling ◽  
Grain Weight ◽  
Rice Varieties ◽  
Fragrant Rice ◽  
Exogenous Application ◽  
Physiological Processes ◽  
Rice Genotypes ◽  
Heading Stage

AbstractZinc (Zn) is an important microelement for rice and plays a key role in many physiological processes. This study assessed the physio-biochemical responses involved in biosynthesis of 2-acety-1-pyrroline (2-AP), which is a key compound in the aroma of fragrant rice, in four different fragrant rice varieties, i.e., Meixiangzhan-2, Xiangyaxiangzhan, Ruanhuayou-134, and Yunjingyou. Four concentrations (0, 0.50, 1.00 and 2.00 g L−1) of zinc chloride were applied to fragrant rice foliage at the heading stage and named CK, Zn1, Zn2 and Zn3, respectively. Our results showed that compared with CK, the Zn1, Zn2 and Zn3 treatments all significantly increased the 2-AP concentration in mature grains of the four fragrant rice genotypes. Furthermore, exogenous application of Zn not only enhanced the activities of enzymes, including proline dehydrogenase (PDH), △1-pyrroline-5-carboxylic acid synthetase (P5CS), and diamine oxidase (DAO), which are involved in 2-AP biosynthesis, but also improved the contents of the related precursors, such as Δ1-pyrroline, proline and pyrroline-5-carboxylic acid (P5C). In addition, compared to the CK treatment, the Zn2 treatment markedly increased the net photosynthetic rate of fragrant rice during the grain filling stage and increased the seed-setting rate, 1000-grain weight and grain yield in all fragrant rice genotypes. Foliar application of Zn also markedly increased the grain Zn content. In general, 1.00 g L−1 seemed to be the most suitable application concentration because the highest 2-AP content and grain weight were recorded with this treatment.

scholarly journals Foliar application of sodium selenate induces regulation in yield formation, grain quality characters and 2-acetyl-1-pyrroline biosynthesis in fragrant rice

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Haowen Luo ◽  
Bin Du ◽  
Longxin He ◽  
Axiang Zheng ◽  
Shenggang Pan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Grain Yield ◽  
Grain Quality ◽  
Foliar Application ◽  
Higher Plants ◽  
Sodium Selenate ◽  
Rice Varieties ◽  
Fragrant Rice ◽  
The Stability ◽  
Heading Stage

Abstract Background Selenium (Se) is a beneficial element for higher plants and essential for mammals. To study the effect of the foliar application of sodium selenate on fragrant rice performance, a pot experiment was conducted in Guangdong, China. At the initial heading stage, one-time foliar application of sodium selenate with concentrations of 0, 10, 20, 30, 40 and 50 μmol·L− 1 (named CK, Se1, Se2, Se3, Se4 and Se5, respectively) were foliar applied on two fragrant rice varieties, ‘Meixiangzhan-2’ and ‘Xiangyaxiangzhan’. Results Selenate application at the initial heading stage not only improved the grain yield of fragrant rice by increasing the seed-setting rate and grain weight, but also promoted the grain quality by increasing crude protein contents and lowering the chalky rice rate. Furthermore, Se applications enhanced the biosynthesis of 2-acetyl-1- pyrroline (2-AP), the main aromatic compound, by increasing the contents of precursors (△1- pyrroline, proline and pyrroline-5-carboxylic acid (P5C)) and the activities of enzymes (proline dehydrogenase (PRODH), △1-pyrroline-5-carboxylic acid synthetase (P5CS), and ornithine aminotransferase (OAT)) in fragrant rice. The results also showed that foliar application of sodium selenate enhanced the antioxidant system of both varieties by promoting the activities of peroxidase (POD), superoxide dismutase (SOD), catalase (CAT) and reducing the contents of malondialdehyde (MDA). Furthermore, the real-time PCR analyses depicted that foliar application of selenate up-regulated the GPX1, GPX4 and CATC transcripts. The higher antioxidative enzymatic activities might strength the stress resistant to ensure the stability of yield in fragrant rice form abiotic stress. Conclusions Foliar applications of sodium selenate at the initial heading stage increased the grain 2-AP content by enhancing the biosynthesis-related enzymes and precursors. The grain yield and quality of fragrant rice also increased due to selenate application. Furthermore, foliar application of selenate promoted the activities of enzymes such as POD, SOD and CAT and up-regulated the expression of gene GPX4, GPX1 and CATC.

scholarly journals Yield and Biochemical Attributes of Brri Dhan-44 (Oryza Sativa L.) as Affected by Tiba Application

2018 ◽  
Vol 44 (2) ◽  
pp. 117-125
Author(s):  
AMM Golam Adam ◽  
Rasedul Islam ◽  
Hasna Hena Begum
Keyword(s):  
Foliar Application ◽  
Oryza Sativa L ◽  
Maximum Yield ◽  
Dry Weight ◽  
Grain Filling ◽  
Grain Weight ◽  
Weight Yield ◽  
Panicle Number ◽  
1000 Grain Weight ◽  
Plant Length

A pot experiment was carried out to evaluate the effect of different concentrations (0, 10, 25, 50 and 100 ppm) of TIBA on yield and biochemical attributes of BRRI dhan-44. Results revealed that number of effective tillers and dry weight of panicle per plant, length of panicle, number of grains per panicle, 1000-grain weight, yield per plant and harvest index increased due to all concentrations of TIBA treatments where, treatments mean varied significantly in majority of cases. The stimulatory effect of TIBA treatments on number of effective tillers and dry weight of panicles per plant, length of panicle, number of grains per panicle and 1000-grain weight resulted significant increase in grain yield per plant. The maximum yield per plant (17.83 g) was obtained from 10 ppm TIBA treatment which was 59.76 % higher over the control. Increases in yield per plant due to 25, 50 and 100 ppm TIBA were 50.53, 47.58 and 28.49%, respectively. Findings of this investigation showed that foliar application of TIBA had beneficial effect on pigment content of leaves at tillering and grain filling stages with a few exceptions. Protein content of leaves was also positively influenced by most of the treatment at tillering stage. Out of five treatments, 10 ppm TIBA produced better results. Asiat. Soc. Bangladesh, Sci. 44(2): 117-125, December 2018

scholarly journals Productivity Enhancement of Foxtail Millet (Setaria italica L.) through Critical Agronomic Interventions under Southern Agro-Climatic Zone of Andhra Pradesh

2021 ◽  
pp. 45-51
Author(s):  
Karanam Navya Jyothi ◽  
V. Sumathi ◽  
D. Subramanyam ◽  
P. Sudhakar ◽  
T. Giridhar Krishna ◽  
...  
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Nutrient Management ◽  
Foliar Application ◽  
Foxtail Millet ◽  
Grain Filling ◽  
Grain Weight ◽  
Growth And Yield ◽  
Straw Yield ◽  
Hand Weeding

A field experiment was conducted during kharif, 2016 and 2017 at S.V. Agricultural College farm, Tirupati to study the influence of spacing, nutrient and weed nutrient management practices on growth and yield of foxtail millet. Significant effects were noticed on growth and yield components viz., plant height, number of panicles m-2, weight of the panicle, grain weight panicle-1, grain and straw yield of foxtail millet. Among different plant geometries tried, closer spacing of 20 cm x10 cm registered taller plants, higher number of panicles m-2, higher grain and straw yield, where as the weight of the panicle, grain weight panicle-1 were found to be highest with 30 cm x10 cm. Among the micronutrient management practices, foliar application of ZnSO4@ 0.5% twice at the time of flowering and at grain filling stage along with 100% RDF registered taller plants as well as higher grain yields.Hand weeding at 20 DAS and 30 DAS outperformed other weed management practices. This was followed by pre-emergence application of butachlor @ 1 kg a.i ha-1 with one hand weeding at 30DAS.The study concluded that the closer spacing of 20cmx 10cm, foliar application of ZnSO4 at the time of flowering and 20 days after flowering along with RDF and hand weeding twice at 20 DAS and 30 DAS resulted in higher productivity of foxtail millet.

scholarly journals Hydrogen rich water (HRW) induces plant growth and physiological attributes in fragrant rice varieties under salt stress

2020 ◽  
Author(s):  
Xiaomeng Fu ◽  
Lin Ma ◽  
Runfei Gui ◽  
Yuzhan Li ◽  
Xiaojuan Yang ◽  
...  
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Foliar Application ◽  
Dry Weight ◽  
Rice Cultivars ◽  
High Concentration ◽  
Rice Varieties ◽  
Fragrant Rice ◽  
Mda Content ◽  
Physiological Attributes

Abstract Hydrogen is an important molecule, exerting antioxidant ability in plants and animals through antioxidant enzymes, which can be dissolved in water. Previous studies have showed that application of hydrogen rich water (HRW), containing a high concentration of hydrogen, plays an important role in enhancing drought tolerance and alleviating the metal stress in plants. However, the effects of HRW on plant growth and physiological attributes in fragrant rice varieties under salt stress are still unclear. A pot experiment was conducted with two fragrant rice varieties i.e. Yuxiangyouzhan and Xiangyaxiangzhan to study the effects of HRW treatments i.e. foliar application of HRW (F-HRW) and irrigation application of HRW (I-HRW) on plant growth and physiological attributes under two NaCl levels (0 mmol L -1 and 150 mmol L -1 ). The results depicte d that, compared with without HRW treatment (CK), the F-HRW and I-HRW treatments significantly increased the dry weight per unit seedling height by 12.64% and 22.99%, while decreased the plant height by 3.92% and 2.97% respectively of two fragrant rice varieties under salt stress. Moreover, compared with CK treatment, the activities of peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) were enhanced by F-HRW and I-HRW treatments in NaCl-stressed fragrant rice cultivars and opposite results were observed for MDA content. In crux, our findings conclude that application of HRW modulates the plant growth and physiological attributes in salt-stressed fragrant rice cultivars.

scholarly journals Response of phytohormone homeostasis to heat stress and the roles of phytohormones in rice grain yield: a review

2019 ◽  
Author(s):  
Chao Wu ◽  
She Tang ◽  
Ganghua Li ◽  
Shaohua Wang ◽  
Shah Fahad ◽  
...  
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Grain Filling ◽  
Reproductive Organs ◽  
Reproductive Stage ◽  
Grain Weight ◽  
Rice Grain ◽  
Vascular Bundles ◽  
Rice Varieties ◽  
Heat Effects

Rice is highly susceptible to heat stress at the reproductive stage. In this review, we first summarize recent progress in heat effects on rice grain yield during different reproductive stages. Different responses of yield traits of rice to heat stress during different reproductive stages are identified. The number of spikelets per panicle is reduced by heat stress during the early reproductive stage but is not affected by heat stress during the mid-late reproductive stage. Spikelet sterility induced by heat stress can be attributed primarily to physiological abnormalities in the reproductive organs during flowering but attributed to structural and morphological abnormalities in reproductive organs during panicle initiation. The lower grain weight caused by heat stress during the early reproductive stage was due to a reduction in non-structural carbohydrates, undeveloped vascular bundles, and a reduction in grain length and width, while a shortened grain filling duration, reduced grain filling rate, and decreased grain width affect grain weight when heat stress occurs during grain filling. Phytohormones play vital roles in regulating plant adaptations against heat stress. We discuss the processes involving phytohormone homeostasis (biosynthesis, catabolism, deactivation, and transport) in response to heat stress. It is currently thought that biosynthesis and transport may be the key processes that determine phytohormone levels and final grain yield in rice under heat stress conditions. Finally, we prospect that screening and breeding rice varieties with comprehensive tolerance to heat stress throughout the entire reproductive phase could be feasible to cope with unpredictable heat events in the future. Studies in phytohormone homeostatic response are needed to further reveal the key processes that determine phytohormone levels under heat condition.

scholarly journals Phenotypic variation and correlation of traits in Philippine hybrid rice varieties

2019 ◽  
Vol 17 (2) ◽  
pp. 179-186
Author(s):  
Aldrin Y. Cantila ◽  
Aizel Mae L. Fordan ◽  
Isagane V. Boholano
Keyword(s):  
Correlation Analysis ◽  
Phenotypic Variation ◽  
Hybrid Rice ◽  
Grain Filling ◽  
Grain Weight ◽  
Thousand Grain Weight ◽  
Rice Varieties ◽  
Days To Maturity ◽  
Secondary Traits ◽  
Grain Filling Stage

Understanding the phenotypic variation and correlation in hybrid rice varieties will lead to proper utilization of these genetic resources. Grain yield (GY), the primary trait, and its secondary traits such as days to 50% flowering (DF), days to maturity (DM), grain length (GL), grain weight (GW), number of filled grains panicle-1 (NFGP), one thousand grain weight (OTGW) panicle length (PL), panicle weight (PW), spikelet fertility (SF), and spikelet number panicle-1 (SNP) of 13 hybrid rice in two environments (E1 and E2) were analyzed using combined analysis of variance (ANOVA) and correlation analysis. High significant variation was found among hybrids (G) in all traits except for GW while there was at least significant result among environments (E) in DF, DM, GL, GW, PW, and OTGW, and in GxE in DF, DM, GW, NFGP, PW, and SNP. Therefore, E1 hybrids were early flowering and maturing, had longer, wider, and more grains, had longer panicles, and higher yield while in E2 hybrids were late flowering and maturing, and had heavier grains. However, among the 13 hybrid rice, M1 had the highest GY and GL in each environment with a mean of 9.57 t ha–1 and 9.75 mm, respectively. M1, therefore, can be recommended to farmers for varietal utilization. Correlation analysis, on the other hand, found 15 and 17 significant correlations in E1 and E2, respectively. Of the correlation results, it was found out that among the secondary traits, only NFGP was consistently, significantly and positively correlated with GY in two environments. The result implied that attaining higher yield in hybrid rice cultivation can be possible by giving more attention to the plants during the grain filling stage. J. Bangladesh Agril. Univ. 17(2): 179–186, June 2019

scholarly journals Response of phytohormone homeostasis to heat stress and the roles of phytohormones in rice grain yield: a review

2019 ◽  
Author(s):  
Chao Wu ◽  
She Tang ◽  
Ganghua Li ◽  
Shaohua Wang ◽  
Shah Fahad ◽  
...  
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Grain Filling ◽  
Reproductive Organs ◽  
Reproductive Stage ◽  
Grain Weight ◽  
Rice Grain ◽  
Vascular Bundles ◽  
Rice Varieties ◽  
Heat Effects

Rice is highly susceptible to heat stress at the reproductive stage. In this review, we first summarize recent progress in heat effects on rice grain yield during different reproductive stages. Different responses of yield traits of rice to heat stress during different reproductive stages are identified. The number of spikelets per panicle is reduced by heat stress during the early reproductive stage but is not affected by heat stress during the mid-late reproductive stage. Spikelet sterility induced by heat stress can be attributed primarily to physiological abnormalities in the reproductive organs during flowering but attributed to structural and morphological abnormalities in reproductive organs during panicle initiation. The lower grain weight caused by heat stress during the early reproductive stage was due to a reduction in non-structural carbohydrates, undeveloped vascular bundles, and a reduction in grain length and width, while a shortened grain filling duration, reduced grain filling rate, and decreased grain width affect grain weight when heat stress occurs during grain filling. Phytohormones play vital roles in regulating plant adaptations against heat stress. We discuss the processes involving phytohormone homeostasis (biosynthesis, catabolism, deactivation, and transport) in response to heat stress. It is currently thought that biosynthesis and transport may be the key processes that determine phytohormone levels and final grain yield in rice under heat stress conditions. Finally, we prospect that screening and breeding rice varieties with comprehensive tolerance to heat stress throughout the entire reproductive phase could be feasible to cope with unpredictable heat events in the future. Studies in phytohormone homeostatic response are needed to further reveal the key processes that determine phytohormone levels under heat condition.

scholarly journals Effects of Light Quality Treatments during the Grain Filling Period on Yield, Quality, and Fragrance in Fragrant Rice

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 531
Author(s):  
Huijia Xie ◽  
Wenjun Xie ◽  
Shenggang Pan ◽  
Xuwei Liu ◽  
Hua Tian ◽  
...  
Keyword(s):  
Grain Yield ◽  
Light Quality ◽  
Red Light ◽  
Biomass Accumulation ◽  
Grain Filling ◽  
Width Ratio ◽  
Rice Varieties ◽  
Fragrant Rice ◽  
Yield Quality ◽  
Grain Filling Period

The effect of the light quality on 2-acetyl-1-pyrroline (2AP) during the grain filling period in fragrant rice has rarely been investigated. A pot experiment was carried out with two fragrant rice varieties, Xiangyaxiangzhan and Yuxiangyouzhan, grown under three light treatments, 100% red light (L1), 100% blue light (L2), and compound light (L3), during the grain filling period, and natural light was taken as the control (CK). The yield, quality, and fragrance were investigated. The results showed that light quality treatments significantly decreased the 2AP content in mature grains by 16.67–32.82% but improved the grain yield by 2.70–21.41% compared to CK. The regulation effects of light quality treatments on grain yield and 2AP are linked to yield-related traits, biomass accumulation, antioxidant physiology, and 2AP formation-related physiology. Additionally, light quality treatments decreased the chalky rice percentage and chalkiness, and increased the length-to-width ratio. Overall, light quality treatments during the grain filling period had a positive effect on the grain yield but not on fragrance in fragrant rice.

scholarly journals Rising Atmospheric Temperature Impact on Wheat and Thermotolerance Strategies

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 43
Author(s):  
Adeel Khan ◽  
Munir Ahmad ◽  
Mukhtar Ahmed ◽  
M. Iftikhar Hussain
Keyword(s):  
High Temperature ◽  
Industrial Revolution ◽  
Foliar Application ◽  
Pollen Viability ◽  
Grain Filling ◽  
Crop Productivity ◽  
Potassium Nitrate ◽  
Agricultural Crop ◽  
Stay Green ◽  
Seed Formation

Temperature across the globe is increasing continuously at the rate of 0.15–0.17 °C per decade since the industrial revolution. It is influencing agricultural crop productivity. Therefore, thermotolerance strategies are needed to have sustainability in crop yield under higher temperature. However, improving thermotolerance in the crop is a challenging task for crop scientists. Therefore, this review work was conducted with the aim of providing information on the wheat response in three research areas, i.e., physiology, breeding, and advances in genetics, which could assist the researchers in improving thermotolerance. The optimum temperature for wheat growth at the heading, anthesis, and grain filling duration is 16 ± 2.3 °C, 23 ± 1.75 °C, and 26 ± 1.53 °C, respectively. The high temperature adversely influences the crop phenology, growth, and development. The pre-anthesis high temperature retards the pollen viability, seed formation, and embryo development. The post-anthesis high temperature declines the starch granules accumulation, stem reserve carbohydrates, and translocation of photosynthates into grains. A high temperature above 40 °C inhibits the photosynthesis by damaging the photosystem-II, electron transport chain, and photosystem-I. Our review work highlighted that genotypes which can maintain a higher accumulation of proline, glycine betaine, expression of heat shock proteins, stay green and antioxidant enzymes activity viz., catalase, peroxidase, super oxide dismutase, and glutathione reductase can tolerate high temperature efficiently through sustaining cellular physiology. Similarly, the pre-anthesis acclimation with heat treatment, inorganic fertilizer such as nitrogen, potassium nitrate and potassium chloride, mulches with rice husk, early sowing, presoaking of a 6.6 mM solution of thiourea, foliar application of 50 ppm dithiothreitol, 10 mg per kg of silicon at heading and zinc ameliorate the crop against the high temperature. Finally, it has been suggested that modern genomics and omics techniques should be used to develop thermotolerance in wheat.

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