Growth of three rice (Oryza sativa L.) cultivars under upland conditions with different levels of water supply 1.: Nitrogen content and dry matter production
Growth of three rice (Oryza sativa L.) cultivars under upland conditions with different levels of water supply 1.: Nitrogen content and dry matter production
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DOI：
10.1626/pps.9.422
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发表时间：
2006-10-01
影响因子：
2.5
通讯作者：
Abe, Jun
中科院分区：
文献类型：
--
作者：
Kato, Yoichiro;Kamoshita, Akihiko;Abe, Jun
总供水量(灌溉加降雨量)将决定生物质产量。本研究旨在阐明水分供应和品种差异对旱作水稻干物质生产的影响。2001-2003年间，3个水稻品种(Yumeno-hatamochi，YHM；‘Lemont’，LMT；‘Nipponbaar’，NPB)在3种水分制度(雨养，RU；灌溉，Iu；成穗期水分亏缺，WD)和淹水的低地(FL)上进行了试验。2001年旱季频繁发生时，旱地旱地上NPB总量(1101gm(-2))比旱地(FL)(1302gm(-2))低15%，但在抽穗前降水充足的条件下，与2003年的旱地(1313对1324gm(-2))相当。2003年，RU成熟期地上部分氮素含量与FL相似，但生育期延长了9d。旱地条件下作物生育期总供水量差异较大(419~1132 mm)，TDM和地上N含量一般随供水量的增加而增加。我们在2002年和2003年的成熟期TDM中都检测到了品种-水分状况的互作。在FL和2003年供水充足的旱地条件下，NPB的TDM最大，但在2002年降雨较少的情况下，TDM最小。2002年NPB的TDM较小是由于较浅的根系发育导致较少的氮素吸收所致。相比之下，YHM具有较深的根系，因此在有限供水的旱地条件下，其吸氮量较大，TDM较小。结果表明，3个品种对水分条件的反应不同，总供水量对旱地TDM的影响主要是通过影响吸氮量来实现的，而吸氮量与根系发育深度有关。
The total water supply (irrigation plus rainfall) would determine biomass production. This study aimed to elucidate the effects of water supply and cultivar differences on the dry matter production of rice grown under upland conditions. Three rice cultivars (Yumeno-hatamochi', YHM; 'Lemont', LMT; 'Nipponbare', NPB) were used on an upland site with three water regimes (rain-fed, RU; irrigated, IU; water deficit during the panicle-formation stage, WD) and in a flooded lowland (FL) in Japan from 2001 to 2003. The total amount of aboveground dry matter (TDM) of NPB in RU (1101 g m(-2)) was 15% lower than that in FL (1302 g m(-2)) in 2001, when dry spells occurred frequently, but was comparable to FL in 2003 (1313 vs. 1324 g m(-2)) under favorable soil water conditions with ample rainfall before heading. The nitrogen (N) content of the aboveground part at maturity in RU in 2003 was similar to that in FL, but the growth duration was 9 days longer in RU. The amount of total water supply during the crop growth differed greatly (419 to 1132 mm) among water regimes and years under upland conditions, where TDM and aboveground N content generally increased with increasing water supply. We detected a cultivar-water regime interaction in TDM at maturity in both 2002 and 2003. In FL and under the upland conditions with adequate water supply in 2003, TDM was the largest for NPB, but it was the smallest in this cultivar in 2002 when rainfall was less frequent. The small TDM of NPB in 2002 resulted from a smaller amount of N uptake associated with shallower root system development. In contrast, YHM had a deeper root system and thus the amount of N uptake was larger and TDM was smaller under upland conditions with limited water supply. Our results indicate that the three cultivars responded differently to the water conditions, and that the total water supply greatly affected TDM in uplands through its effects on the amount of N uptake, which was associated with the depth of root development.