Rice Cultivar Takanari Has Higher Photosynthetic Performance Under Fluctuating Light Than Koshihikari, Especially Under Limited Nitrogen Supply and Elevated CO2
Rice Cultivar Takanari Has Higher Photosynthetic Performance Under Fluctuating Light Than Koshihikari, Especially Under Limited Nitrogen Supply and Elevated CO2
复制标题
DOI：
10.3389/fpls.2020.01308
复制
发表时间：
2020-09-01
影响因子：
5.6
通讯作者：
Adachi, Shunsuke
中科院分区：
文献类型：
--
作者：
Ohkubo, Satoshi;Tanaka, Yu;Adachi, Shunsuke
田间的植物经历阳光的动态变化，而不是稳态照射。因此，提高波动光照下单个叶片的光合速率对于提高作物产量至关重要。高产籼稻（Oryza sativaL.）栽培品种高成被认为是光合作用基因的潜在供体，因为其在大气和高CO（2）浓度下的稳态光合作用高于包括越光在内的几个日本商业栽培品种。光合诱导后突然增加的光强度是更快的高成比越光，但是否高成的每日碳增益优于越光下波动的光在该领域还不清楚。在此，我们报告高成有较高的非稳态光合作用，特别是在低氮（N）供应，比越光。在盆栽实验中，在大气（400 ppm）和升高（800 ppm）的CO（2）浓度下，在模拟自然波动光下，突然增加照射和更高的每日CO（2）同化后的最初10分钟内，高成具有更大的叶片碳增益。在田间条件下，低氮供应的电子传递速率在一天内也高于高成越光。虽然高成的优势在高氮供应下减少，但高成的光合氮利用效率始终高于越光，在低氮和高氮供应下。这项研究表明，高成是一个有前途的供体亲本，可用于育种计划，旨在增加CO（2）同化在广泛的环境，包括未来更高的CO（2）浓度。
Plants in the field experience dynamic changes of sunlight rather than steady-state irradiation. Therefore, increasing the photosynthetic rate of an individual leaf under fluctuating light is essential for improving crop productivity. The high-yieldingindicarice (Oryza sativaL.) cultivar Takanari is considered a potential donor of photosynthesis genes because of its higher steady-state photosynthesis at both atmospheric and elevated CO(2)concentrations than those of several Japanese commercial cultivars, including Koshihikari. Photosynthetic induction after a sudden increase in light intensity is faster in Takanari than in Koshihikari, but whether the daily carbon gain of Takanari outperforms that of Koshihikari under fluctuating light in the field is unclear. Here we report that Takanari has higher non-steady-state photosynthesis, especially under low nitrogen (N) supply, than Koshihikari. In a pot experiment, Takanari had greater leaf carbon gain during the initial 10 min after a sudden increase in irradiation and higher daily CO(2)assimilation under simulated natural fluctuating light, at both atmospheric (400 ppm) and elevated (800 ppm) CO(2)concentrations. The electron transport rate during a day under field conditions with low N supply was also higher in Takanari than in Koshihikari. Although the advantages of Takanari were diminished under high N supply, photosynthetic N use efficiency was consistently higher in Takanari than in Koshihikari, under both low and high N supply. This study demonstrates that Takanari is a promising donor parent to use in breeding programs aimed at increasing CO(2)assimilation in a wide range of environments, including future higher CO(2)concentrations.