Impact of bio-fertilizers on root characters and reproductive physiology of rice (Oryza sativa L.) (Record no. 289305)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 05774nam a22001817a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 571.2 |
| Item number | SAN/IM PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Sanith Kumar Reddy S |
| 245 ## - TITLE STATEMENT | |
| Title | Impact of bio-fertilizers on root characters and reproductive physiology of rice (Oryza sativa L.) |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department of Plant Physiology, College of Agriculture |
| Date of publication, distribution, etc | 2021 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 118p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | The study entitled “Impact of bio-fertilizers on root character and reproductive physiology of rice (Oryza sativa L.)” was undertaken with the objective of elucidating the effect of bio-fertilizers on hormonal status, root character and reproductive traits like flowering, pollen characteristics, spikelet fertility and yield in rice. The experiment was conducted as a pot culture experiment at the Department of Plant Physiology, College of Agriculture, Vellayani during 2020-2021. The experiment was laid out in CRD with ten treatments and three replications. The treatments comprised of T1: POP, KAU + Azolla, T2: POP, KAU + AMF, T3: POP, KAU + PGPR Mix I, T4: POP, KAU + PSB, T5: POP, KAU + KSB, T6: T1 + AMF, T7: T1 + PGPR Mix I, T8: T1 + PSB, T9: T1 + KSB and T10: Control. The experimental results revealed that plant height, number of tillers per plant, dry matter production, number of productive tillers, specific leaf area, number of grains per panicle, 1000 grain weight, grain yield, straw yield and harvest index increased by the application of different bio-fertilizers. Among the treatments, incorporation of Azolla and PGPR Mix I along with POP, KAU recommendations (T7) recorded highest values in the cases of plant height (99.83 cm), number of tillers (15.33), straw yield (42.24 g per plant) and dry matter production (84.69 g per plant) compared to control. But the number of productive tillers (12.66), specific leaf area (372.98 cm2 g -1 ), number of grains per panicle (129), 1000 grain weight (24.16 g), grain yield (31.85 g per plant) (36.02%) and harvest index (0.46) were found to be maximum in T6 (POP, KAU + Azolla + AMF) compared to the control. Incorporation of Azolla and AMF along with POP recommendations (T6) significantly reduced the number of days to heading (6 days) as well as number of days to 50% flowering compared to control. A significant increase in physiological and biochemical parameters such as total chlorophyll content, total carbohydrate, protein content and reducing sugar was achieved by the application of different bio-fertilizers. Among the treatments, T6 (POP, KAU + Azolla + AMF) showed significant increase in total chlorophyll content (71.05%), total carbohydrate (73.87%), protein content (35.10%) and reducing sugar (19%) compared to control at booting stage. Hormonal status (IAA and GA contents) and root characters such as root length, root diameter, stele diameter, width of aerenchyma, late metaxylem number, late metaxylem diameter and early metaxylem number were found to significantly improve by the application of different bio-fertilizers. Among the treatments, IAA and GA in leaf tissue at 60 DAS (2.28 and 1.09 µg g-1 ) and 80 DAS (2.39 and 1.15 µg g-1 ) were found to significantly increase in T7 (POP, KAU + Azolla + PGPR Mix I) compared to control. However, T6 (POP, KAU + Azolla + AMF) showed significant improvement in root characters such as root length (31.72 cm), root diameter (1.03 mm), stele diameter (0.45 mm), width of aerenchyma (67.01 mm), late metaxylem number (5.01), late metaxylem diameter (0.052) and early metaxylem number (28.94) compared to the control. Bio-fertilizer application was found to enhance the grain quality significantly by enhancing the levels of total carbohydrate, protein, phosphorus, calcium, iron and zinc and by reducing amylose content. Among the treatments, T6 (POP, KAU + Azolla + AMF) showed significant reduction in amylose content (16%) in grains compared to control. Incorporation of Azolla and AMF along with POP recommendations (T6) showed significant increase in protein content (55.08%) and nutrient status such as phosphorus (58.33%), calcium (61.76%), iron (72.67%) and zinc (66.89%) in grains compared to control whereas carbohydrate content (24.02%) and iron content (74.32%) in grains were found to significantly increase in T7 (POP, KAU + Azolla + PGPR Mix I). In the present investigation, incorporation of Azolla and PGPR along with POP (KAU) recommendations were found to improve hormonal status and dry matter production whereas, incorporation of Azolla and AMF along with POP recommendations were found to improve physio-morphological and biochemical parameters as well as yield and quality parameters in the rice variety Uma. These biofertilizers were also effective in improving the root characteristics in terms of metaxylem number and diameter which will have an impact on water and mineral uptake and translocation. It will also help to improve water-use efficiency and impart stress tolerance through better exploitation of soil water and nutrient reserves. The benefits of biofertilizers can be exploited in soils low in available nutrients. Under drought conditions their association can augment water uptake and transport to the host enhancing stress tolerance. This role of biofertilizers can potentially strengthen plant adaptability to changing environment. Standardization of a recommendation can be undertaken for improving the field performance and quality of rice based on the best results of the current programme. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Bio-fertilizers |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Reproductive physiology of rice |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Oryza sativa L. |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Manju, R V (Guide) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2022-04-20 | 571.2 SAN/IM PG | 175245 | 2022-04-20 | Theses |