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首页> 外文期刊>Tropical Agriculture and Development >Effects of nitrogen supply restriction on photosynthetic characters and dry matter production in Vietiai 20, a Vietnamese hybrid rice variety, during grain filling stage.
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Effects of nitrogen supply restriction on photosynthetic characters and dry matter production in Vietiai 20, a Vietnamese hybrid rice variety, during grain filling stage.

机译：氮素供应限制对越南杂交水稻品种Vietiai 20灌浆期光合特性和干物质产生的影响。

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摘要

Photosynthetic activity of flag leaves and dry matter production during the grain filling stage of Vietlai 20 (VL20), a Vietnamese hybrid rice variety, were examined and compared to those of its maternal cultivar (103S) and paternal cultivar (R20) under standard nitrogen (SN) and low nitrogen (SN) conditions. The results showed that the above-ground dry matter weight (DW) was not significantly different between VL20 and 103S under the LN condition. Also, there was no difference in the DW between VL20 and R20; while, VL20 exhibited a higher rate of panicle dry weight increase (PDW) than R20 under both SN and LN conditions. Because 103S is a thermo-sensitive genic male sterile line, PDW was negligible in 103S during maturity in the present experiment. With a restriction in N supply, the maximum CO2 exchange rate (CERmax), flag leaf nitrogen content (FLNC) and ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) content decreased in VL20 and R20. However, VL20 exhibited a higher sustainability in both duration of grain filling and response to N deficiency in terms of CERmax value, FLNC and Rubisco content than R20. VL20 also showed significantly a higher value of quantum yield efficiency of PSII ( Phi PSII) and lower value of non-photochemical quenching (NPQ) than R20 under the LN condition. Although the chlorophyll (Chl) content was not significantly different between VL20 and R20, the ratio of Chl/Rubisco was lower in VL20 than in R20 under the LN condition. These results indicated that the high FLNC and Rubisco content, and relatively low Chl/Rubisco ratio would result in a high photosynthetic rate and Phi PSII value in the F1 hybrid during the grain filling stage under the restriction of N supply.
机译：对越南杂交水稻品种Vietlai 20（VL20）的籽粒灌浆期旗叶的光合活性和干物质产生进行了检测，并将其与标准氮水平下其母本（103S）和父本（R20）进行比较。 SN）和低氮（SN）条件。结果表明，在LN条件下，VL20和103S的地上干物质重量（DW）没有显着差异。同样，VL20和R20之间的DW并无差异。在SN和LN条件下，VL20的穗干重增加率（PDW）均高于R20。由于103S是热敏感的雄性不育系，因此在本实验中，PDW在103S成熟期间可以忽略不计。在氮供应的限制下，VL20和CO2的最大CO 2 交换速率（CERmax），旗叶氮含量（FLNC）和核糖-1,5-双磷酸羧化酶/加氧酶（Rubisco）含量降低。 R20。但是，VL20在谷物灌浆持续时间和对氮缺乏的响应方面都表现出比R20更高的可持续性，无论是CERmax值，FLNC还是Rubisco含量。在LN条件下，VL20的PSII（Phi PSII ）的量子产率效率值也显着高于R20，而非光化学猝灭（NPQ）值也较低。尽管VL20和R20之间的叶绿素（Chl）含量没有显着差异，但在LN条件下，VL20中的Ch1 / Rubisco比率低于R20。这些结果表明，较高的FLNC和Rubisco含量，以及相对较低的Chl / Rubisco比值将导致F 1 杂种在光合作用期间具有较高的光合速率和Phi PSII 值。氮素供应的限制下，处于灌浆期。

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