Estimation of sink capacity of rice grains: A comparison of calculation methods based on 1000-grain weight and grain projected area
ABSTRACTAccurate estimation of sink capacity in rice (grain number × potential grain size), independent of grain filling, is necessary for considering source – sink interactions. However, how to measure potential grain size is still a matter of debate. Here, we investigated the effect of modifying t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2023-07-01
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| Series: | Plant Production Science |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/1343943X.2023.2228500 |
| Summary: | ABSTRACTAccurate estimation of sink capacity in rice (grain number × potential grain size), independent of grain filling, is necessary for considering source – sink interactions. However, how to measure potential grain size is still a matter of debate. Here, we investigated the effect of modifying the grain-filling environment on 1000-grain weight of grains screened by specific gravity or brown rice thickness, grain projected area (‘grain area’), or husk weight as candidate indicators of potential grain size using a japonica cultivar Koshihikari and its near-isogenic line with greater spikelet number. We found grain area to be the best, followed by 1000-grain weight. We developed a novel method to calculate sink capacity from grain area; the method was developed based on the relationship between individual grain weight and grain area. Comparison with the conventional method based on 1000-grain weight showed that although the method based on grain area is more accurate, that based on 1000-grain weight is useful enough, because screening by specific gravity or brown rice thickness selected filled grains well, and the effect of the grain-filling environment on 1000-grain weight was limited. |
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| ISSN: | 1343-943X 1349-1008 |