Performance of Dry-Seeded Rice Genotypes under Varied Soil Moisture Regimes and Foliar-Applied Hormones
| Autor: | Bavita Asthir, Bhagirath S. Chauhan, Gulshan Mahajan, Virender Sardana, Rajinder Pal |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Irrigation enzymatic activity antioxidant activity Plant Science 01 natural sciences Article chemistry.chemical_compound Dry matter Water content Gibberellic acid Ecology Evolution Behavior and Systematics Panicle Ecology leaf area index yield attributes Botany Moisture stress food and beverages 04 agricultural and veterinary sciences oxidative defense mechanism growth regulating substances Horticulture Point of delivery chemistry QK1-989 040103 agronomy & agriculture stay green genotypes 0401 agriculture forestry and fisheries harvest index Sink (computing) 010606 plant biology & botany |
| Zdroj: | Plants Volume 9 Issue 4 Plants, Vol 9, Iss 539, p 539 (2020) |
| ISSN: | 2223-7747 |
| DOI: | 10.3390/plants9040539 |
| Popis: | Plant hormones influence various physiological processes during the growth and development of plants, but their critical roles in influencing yield and antioxidant activities in dry-seeded rice (DSR) have not been adequately explored. This study aims to analyze the performance and antioxidant activity of contrasting genotypes of DSR in response to soil moisture regimes and foliar-applied hormones. The study comprised sixteen treatments that were evaluated under field conditions as per split-plot design in three replications. Treatments comprised combinations of two soil moisture tension regimes (10 kPa and 20 kPa) and two genotypes (PR-111, non-stay-green type and PR-123, stay-green type) applied to the main plots and foliar application of three hormones (gibberellic acid (GA3) 40 mg kg&minus 1, abscisic acid (ABA) 20 mg kg&minus 1, and cytokinin (CK) 40 mg kg&minus 1)) and a control (unsprayed) to subplots. The non-stay-green genotype (PR-111) resulted in 34.6% more grain yield (6.48 t ha&minus 1) than the stay-green genotype (PR-123) at the lower soil moisture tension regime (SMTR) (10 kPa) due to the increased number of filled grains per panicle and improvement in harvest index (HI). At the higher SMTR (20 kPa), the stay-green genotype (PR-123) produced 26.4% more grain yield (5.21 t ha&minus 1) than non-stay green genotype (4.12 t ha&minus 1) and showed enhanced superoxide dismutase (SOD) and peroxide dismutase (POD) activity that may have contributed in maintaining sink size through improved chlorophyll content. Grain yield (6.35 t ha&minus 1) with foliar-applied GA3 (40 mg kg&minus 1) at SMTR of 10 kPa was higher by 12.2% and 24.0% than with foliar-applied ABA (20 mg kg&minus 1) and unsprayed treatments, respectively. Irrigation application at SMTR of 20 kPa and foliar application of ABA gave 24.1% higher grain yield (5.15 t ha&minus 1) than the unsprayed treatment, but it was similar to foliar-applied GA3 and CK. This study implied that the stay-green genotype (PR-123) was more suitable under moisture stress conditions (20 kPa) in DSR, as it maintained sink size even under moisture stress conditions by improving dry matter translocation and enhancing SOD and POD activity. The study suggests the need to find out the endogenous level of these plant hormones in rice genotypes under a range of water regimes to develop high yielding and water use efficient genotypes of DSR. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|