Effect of water management technique on iron toxicity tolerance of rice | |
| Author | Khalid, Bareerah |
| Call Number | AIT Thesis no.AS-23-02 |
| Subject(s) | Iron--Toxicology Rainfed lowland rice Plants--Effect of stress on Rice |
| Note | A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Agricultural Systems and Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Rice (Oryza sativa L.) is one of the most important cereal crops and the staple food for more than half of the world's population, especially in Asia which is prone to iron (Fe) toxicity, particularly in low-lying areas where anaerobic conditions favor the formation of toxic ferrous ions (Fe2+) in the soil. It damages the root system, and inhibits plant growth and development, leading to yield losses approximately up to 70%. The objective of the research was to mitigate the Fe toxicity stress on rice through the effects of water management technique. It was a factorial experiment, following the completely randomized design, with three replications and three factors (consisted of 2 rice genotypes [RD31 and RD85]), 4 water potential levels (5 cm standing water [control], 0 kPa, −15 kPa, and −30 kPa water potential levels, and 4 levels of FeSO4.7H2O treatment (0 mg L−1 [control], 300 mg L−1 , 600 mg L−1 and 900 mg L−1 ). The results showed that the water management technique significantly reduced the Fe toxicity in rice. On an average, water potential level mitigated at best were 41%, 18%, 37%, 28%, 19%, 15%, 42%, 26%, 41%, and 28% of root length, shoot dry matter, root dry matter, effective tiller (%), filled grain (%), 1000-grain weight, grain yield, leaf greenness, net photosynthetic rate, and membrane stability index, respectively, with subsequent reduction of 2 folds in leaf bronzing score, 3 folds in leaf Fe content, and 3 folds in root Fe content. Fe level of 300 mg L−1 was found non-toxic, while 600 mg L−1 and 900 mg L −1 Fe level were toxic for rice plants. In term of genotypes, RD85 performed better than RD31. Leaf and root Fe content were much lower at −30 kPa but this water potential level compared with −15 kPa, however, −30 kPa caused significant loss of leaf relative water content, and thereby resulted in lower performance in most of the tested parameters than −15 kPa. Thus, −15 kPa water potential level was the best water management technique to reduce Fe toxicity in rice. |
| Year | 2023 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural Systems and Engineering (ASE) |
| Chairperson(s) | Datta, Avishek; |
| Examination Committee(s) | Himanshu, Sushil Kumar;Zulfiqar, Farhad; |
| Scholarship Donor(s) | Her Majesty the Queen’s Scholarships (Thailand); |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2023 |