Tropical Agriculture and Development
Online ISSN : 1882-8469
Print ISSN : 1882-8450
ISSN-L : 1882-8450
Original Article
Effect of Soil Moisture Stress at Panicle Development Stage on Spikelet Differentiation and Degeneration of Upland NERICA Cultivars
Momoko IWATA-HIGUCHIJun-Ichi SAKAGAMISachio MARUYAMA
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2019 年 63 巻 3 号 p. 150-159

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The aim of this investigation was to clarify the effect of soil moisture stress at the panicle development stage on spikelet differentiation and degeneration of NERICA cultivars. In 2012, five upland rice cultivars (NERICA 1 (N1), NERICA 4 (N4), NERICA 7 (N7), WAB56-104 and Yumenohatamochi) were grown in pots with application of soil moisture stress of -20 to -49 kPa for 20 days at panicle formation (PF) or booting (BT) stages. Similar stress was imposed on these cultivars excluding WAB56-104 for 15 days at spikelet formation (SF) stage in 2013. The stress reduced the number of differentiated primary rachis branches (PB), secondary rachis branches (SB) and spikelets in PF and increased the number of degenerated PB, SB and spikelets in BT and SF. N4 had a larger number of differentiated spikelets on SB, N7 had a larger spikelet mass, and these cultivars had higher percentage of degenerated spikelets than N1 and Yumenohatamochi. N4 and N7 tended to have larger shoot dry weight (SDW) and non-structural carbohydrate (NSC), but greater decline in these parameters than N1 and Yumenohatamochi under moisture stress in SF. Furthermore, the number of surviving spikelets per SDW or NSC, defined as spikelet surviving efficiency, of N4 and N7 was relatively smaller than those of N1 and Yumenohatamochi. The results suggest that cultivar differences in spikelet degeneration under soil moisture stress are ascribed to carbohydrate availability and spikelet surviving efficiency, which reflects panicle structure and spikelet mass.

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© 2019 Japanese Society for Tropical Agriculture
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