Cross-locational experiments to reveal yield potential and yield-determining factors of the rice cultivar ‘Hokuriku 193’ and climatic factors to achieve high brown rice yield over 1.2kg m-2 at Nagano in central inland of Japan
Masaki Okamura, J. Hosoi, K. Nagata, Kentaro Koba, D. Sugiura, Yumiko Arai-Sanoh, N. Kobayashi, M. Kondo
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引用次数: 1
Abstract
ABSTRACT Understanding the yield potential and yield-determining factors of recent high-yielding cultivars is essential for further increasing rice yield. In this study, a cross-locational field experiment was conducted across 3 years using ‘Hokuriku 193ʹ (H193), a high-yielding cultivar, at four sites including one in Nagano Prefecture, which is the highest-yielding region in Japan. The highest mean yields of 3 years, 1214 g m−2 for brown rice grains and 1586 g m−2 for rough grains, were recorded at the Nagano site. The yields from the 17 environments were strongly correlated with spikelet number per square meter while percentage of filled grain was relatively stable, suggesting that sink capacity is the primary determining factor for grain yield of H193. The climatic factors for high spikelet number at the Nagano site can be explained by the high cumulative radiation before heading associated with longer duration until heading by low night temperature. In addition, a large increase in shoot dry weight during grain filling (ΔW) and high radiation use efficiency (ΔW/rad) at the Nagano site could satisfy large source demand by the large sink size. The high ΔW/rad at the Nagano site associated with low night temperature. This study demonstrated high yield potential of H193 and revealed an environment that achieves extra-high yields in H193, which provided insight to attain further increase in rice yield. Graphical abstract
摘要了解近期高产品种的产量潜力和产量决定因素对进一步提高水稻产量至关重要。在这项研究中,使用高产品种“Hokuriku 193”(H193)在四个地点进行了为期3年的跨地点田间试验,其中一个地点位于日本产量最高的长野县。长野地区记录了3年来的最高平均产量,糙米产量为1214 g m−2,粗粮产量为1586 g m−2。17个环境的产量与每平方米小穗数呈强相关,而灌浆粒率相对稳定,表明库容量是H193籽粒产量的主要决定因素。长野地区小穗数高的气候因素可以解释为抽穗前的高累积辐射与夜间低温下抽穗前的较长持续时间有关。此外,长野地区灌浆期间茎干重(ΔW)的大幅增加和高辐射利用效率(ΔW/rad)可以通过大水槽尺寸来满足大源需求。长野现场的高ΔW/rad与夜间低温有关。这项研究证明了H193的高产潜力,并揭示了H193实现超高产的环境,为进一步提高水稻产量提供了见解。图形摘要
期刊介绍:
Plant Production Science publishes original research reports on field crops and resource plants, their production and related subjects, covering a wide range of sciences; physiology, biotechnology, morphology, ecology, cropping system, production technology and post harvest management. Studies on plant production with special attention to resource management and the environment are also welcome. Field surveys on cropping or farming system are also accepted. Articles with a background in other research areas such as soil science, meteorology, biometry, product process and plant protection will be accepted as long as they are significantly related to plant production.