Relationships among the chalkiness, kernel size and endosperm cell morphology of rice kernels at different spikelet positions within a panicle
| Autor: | Junichi Yonemaru, Akira Miyazaki, Yoshinori Yamamoto, Akiko Ikeda, Satoshi Morita |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
kernel size Morphology (linguistics) genetic structures information science lcsh:Plant culture Biology Cell morphology 01 natural sciences Endosperm Chalky kernel endosperm cell natural sciences lcsh:SB1-1110 Kernel size Panicle cross section grain appearance quality traits rice food and beverages 04 agricultural and veterinary sciences Horticulture 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | SC10201901230014 NARO成果DBr Plant Production Science, Vol 21, Iss 3, Pp 225-232 (2018) |
| ISSN: | 1349-1008 1343-943X |
| DOI: | 10.1080/1343943x.2018.1486216 |
| Popis: | The occurrence of chalky kernels in rice is causally related to kernel size and endosperm morphology. This study aimed to investigate the occurrence of chalky kernels by analyzing kernel size, and the number and area of endosperm cells. Spikelets were sampled from upper and middle primary branches and lower secondary branches in a panicle, and divided into four categories: upper, middle, and lower perfect (PF) kernels and lower milky-white (MW) kernels. On the lower secondary branches, there was a higher percentage of chalky kernels, with smaller kernel lengths, widths and thicknesses, than the kernels on the upper and middle primary branches. MW kernels were smaller in size than PF kernels even on the same lower secondary branches. Regardless of grain appearance quality traits, the total areas of endosperm cross sections in lower kernels were significantly smaller than in upper kernels owing to the decreased cell area, and there was a significant negative correlation between the number of cells and average cell area. When the numbers and the areas of cells were analyzed using angular 30° intervals from the line connecting the center point and the dorsal vascular bundle, the MW kernels had significantly less cells than PF kernels near the ventral side at 120–180°. Thus, the decrease in the number of cells near the ventral side was a main causal factor in the decrease in MW kernel widths compared with PF kernel widths, and this suggested that cell division in MW kernels was inhibited at the early grain-filling stage. |
| Databáze: | OpenAIRE |
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