Contribution of Nitrogen Absorbed during Ripening Period to Grain Filling in a High-Yielding Rice Variety, Takanari
Contribution of Nitrogen Absorbed during Ripening Period to Grain Filling in a High-Yielding Rice Variety, Takanari
复制标题
高产水稻品种 Takanari 成熟期氮素吸收对籽粒灌浆的贡献
DOI：
10.1626/pps.12.176
复制
发表时间：
2009
影响因子：
2.5
通讯作者：
T. Yamagishi
中科院分区：
文献类型：
--
作者：
M. Ida;R. Ohsugi;H. Sasaki;N. Aoki;T. Yamagishi
高产水稻品种要求氮素在穗部大量积累。本研究的目的是澄清在成熟期（实验）氮分配的变化。1)并量化了成熟期吸收的N对成熟期穗N的贡献（Exp. 2)在高产品种高成中，与作为对照的日本晴进行比较。在Exp.在小麦抽穗期施用1，15 N标记氮（15 N），研究了新吸收氮在小麦体内的分配规律。在Exp. 2、在灌浆期进行15 N分次施用，以估计上述贡献。在Exp.结果表明：（1）成熟期植株氮和吸收的~（15）N分配到穗部的比例高，分配到叶部的比例低，但植株氮和吸收的~（15）N在成熟期积累较多。氮素分配的差异表明穗部氮素需求的差异大于氮素吸收的差异。在Exp. 2.籽粒灌浆期的品种间差异较大，日本晴在抽穗后28 d以后，穗部氮素积累量很少，而高成在这段时间内，穗部氮素的积累量约为穗部氮素的1/4。估计表明，在高成，13.5%的穗氮来自28天后吸收的氮。这些结果表明，利用新吸收的氮直到抽穗后的后期是重要的高产的实现。
Absract High-yielding rice varieties require a large accumulation of N in panicles. The objectives of this study were to clarify the change in N allocation during the ripening period (Exp. 1) and to quantify the contribution of N absorbed during the ripening period to panicle N at maturity (Exp. 2) in the high-yielding variety Takanari in comparison with that in Nipponbare as a control. In Exp. 1, 15N-labeled N (15N) was applied at heading to investigate the distribution of newly absorbed N as well as the allocation of plant N. In Exp. 2, split 15N application was performed during the filling period to estimate the above contribution. In Exp. 1, the allocation of plant N and absorbed 15N to the panicles was larger and that to the leaves was smaller in Takanari than in Nipponbare during the ripening period, although Takanari accumulated more N at maturity. The difference in N allocation suggested that the difference in N demand in panicles would be larger than that in N uptake. In Exp. 2, the varietal difference in the grain filling duration was observed: Nipponbare accumulated little N in the panicles after 28 d after heading (DAH), while Takanari accumulated about a quarter of its panicle N during that time. An estimate showed that in Takanari, 13.5% of the panicle N was derived from N absorbed after 28 DAH. These results suggest that the utilization of newly absorbed N until a later period after heading is important for the achievement of high yields.
摘穗对水稻木质部细胞分裂素水平及吸氮活性的影响
DOI：
--
发表时间：
2006
期刊：
Soil Science and Plant Nutrition 52・3
影响因子：
--
作者：
Ikezawa N;Iwasa;K.;and Sato F.;Shinano T.
通讯作者：
Shinano T.