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- Title
IMPACT OF FISSURE LOCATION ON THE GERMINATION AND VIGOR OF SEED RICE.
- Authors
Olaoni, Samuel; Luthra, Kaushik; Bautista, Rustico C.; Atungulu, Griffiths
- Abstract
Drying-induced fissures in rice seeds may impact seed germination and vigor. We hypothesized that the extent of the impact may depend on the type of fissure and its proximity to the embryo, where the plant sprouts. Thus, the objective of this research was to classify fissures in rough rice seeds based on their types and proximity to the embryo and to quantify their impact on seed germination and vigor. Two long-grain hybrid cultivars (RT 7301 & RTv 7303), each with two harvest moisture content (HMC) levels ranging from medium MC (19% - 21%) to high MC (22% - 24%) wet basis (w.b.) were used during this experiment. To induce fissures required for this study, rough rice samples were dried to 12.5% MC w.b. as thin layers at an air temperature of 60°C and 25% relative humidity (RH). Following drying, X-ray imaging was used to detect fissures and record the images generated. Recorded kernel images were enumerated and classified based on fissure types and proximity to the embryo, with kernels without fissures identified as control samples. The classified samples were then subjected to germination and vigor tests. Cultivar had the most statistically significant effect on seed germination and vigor, with RTv 7303 exhibiting higher germination in high MC seeds and RT 7301 in medium MC seeds, suggesting that each cultivar has its own unique response to seed germination and vigor. For high MC seeds based on both classifications, seed germination was observed to be between 72% - 91% and in the range of 88% - 93% for medium MC seeds. In addition, fissure classification based on proximity to the embryo had no significant effect on seed germination and vigor, which could be attributed to the fact that the detected fissures were not located very close to the embryo. However, because the fissure types identified between the high MC and medium MC seeds were different, fissure types had a significant effect on seed germination and vigor, with the impact on germination declining by as low as 18 percentage points (pp) and vigor dropped by 6.0 m.%. Overall, these findings highlight the importance of fissure classifications on seed rice germination and vigor.
- Subjects
GERMINATION; X-ray imaging; HUMIDITY; RICE seeds; ATMOSPHERIC temperature; EMBRYOS; SEEDS
- Publication
Journal of the ASABE, 2024, Vol 67, Issue 3, p533
- ISSN
2769-3295
- Publication type
Article
- DOI
10.13031/ja.15758